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8197971bce
the old thread may work on a new connection and assign the same ID in parallel. Submitted By: Michael Thorpe Committed By: covener git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1651088 13f79535-47bb-0310-9956-ffa450edef68
3773 lines
136 KiB
C
3773 lines
136 KiB
C
/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* This MPM tries to fix the 'keep alive problem' in HTTP.
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*
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* After a client completes the first request, the client can keep the
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* connection open to send more requests with the same socket. This can save
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* significant overhead in creating TCP connections. However, the major
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* disadvantage is that Apache traditionally keeps an entire child
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* process/thread waiting for data from the client. To solve this problem,
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* this MPM has a dedicated thread for handling both the Listening sockets,
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* and all sockets that are in a Keep Alive status.
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*
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* The MPM assumes the underlying apr_pollset implementation is somewhat
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* threadsafe. This currently is only compatible with KQueue and EPoll. This
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* enables the MPM to avoid extra high level locking or having to wake up the
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* listener thread when a keep-alive socket needs to be sent to it.
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*
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* This MPM does not perform well on older platforms that do not have very good
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* threading, like Linux with a 2.4 kernel, but this does not matter, since we
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* require EPoll or KQueue.
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*
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* For FreeBSD, use 5.3. It is possible to run this MPM on FreeBSD 5.2.1, if
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* you use libkse (see `man libmap.conf`).
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*
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* For NetBSD, use at least 2.0.
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*
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* For Linux, you should use a 2.6 kernel, and make sure your glibc has epoll
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* support compiled in.
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*
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*/
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#include "apr.h"
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#include "apr_portable.h"
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#include "apr_strings.h"
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#include "apr_file_io.h"
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#include "apr_thread_proc.h"
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#include "apr_signal.h"
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#include "apr_thread_mutex.h"
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#include "apr_poll.h"
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#include "apr_ring.h"
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#include "apr_queue.h"
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#include "apr_atomic.h"
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#define APR_WANT_STRFUNC
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#include "apr_want.h"
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#include "apr_version.h"
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#include <stdlib.h>
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#if APR_HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#if APR_HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#if APR_HAVE_SYS_WAIT_H
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#include <sys/wait.h>
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#endif
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#ifdef HAVE_SYS_PROCESSOR_H
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#include <sys/processor.h> /* for bindprocessor() */
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#endif
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#if !APR_HAS_THREADS
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#error The Event MPM requires APR threads, but they are unavailable.
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#endif
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#include "ap_config.h"
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#include "httpd.h"
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#include "http_main.h"
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#include "http_log.h"
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#include "http_config.h" /* for read_config */
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#include "http_core.h" /* for get_remote_host */
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#include "http_connection.h"
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#include "http_protocol.h"
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#include "ap_mpm.h"
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#include "mpm_common.h"
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#include "ap_listen.h"
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#include "scoreboard.h"
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#include "fdqueue.h"
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#include "mpm_default.h"
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#include "http_vhost.h"
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#include "unixd.h"
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#include "apr_skiplist.h"
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#include "util_time.h"
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#include <signal.h>
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#include <limits.h> /* for INT_MAX */
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#if HAVE_SERF
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#include "mod_serf.h"
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#include "serf.h"
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#endif
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/* Limit on the total --- clients will be locked out if more servers than
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* this are needed. It is intended solely to keep the server from crashing
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* when things get out of hand.
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*
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* We keep a hard maximum number of servers, for two reasons --- first off,
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* in case something goes seriously wrong, we want to stop the fork bomb
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* short of actually crashing the machine we're running on by filling some
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* kernel table. Secondly, it keeps the size of the scoreboard file small
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* enough that we can read the whole thing without worrying too much about
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* the overhead.
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*/
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#ifndef DEFAULT_SERVER_LIMIT
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#define DEFAULT_SERVER_LIMIT 16
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#endif
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/* Admin can't tune ServerLimit beyond MAX_SERVER_LIMIT. We want
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* some sort of compile-time limit to help catch typos.
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*/
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#ifndef MAX_SERVER_LIMIT
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#define MAX_SERVER_LIMIT 20000
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#endif
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/* Limit on the threads per process. Clients will be locked out if more than
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* this are needed.
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*
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* We keep this for one reason it keeps the size of the scoreboard file small
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* enough that we can read the whole thing without worrying too much about
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* the overhead.
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*/
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#ifndef DEFAULT_THREAD_LIMIT
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#define DEFAULT_THREAD_LIMIT 64
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#endif
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/* Admin can't tune ThreadLimit beyond MAX_THREAD_LIMIT. We want
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* some sort of compile-time limit to help catch typos.
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*/
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#ifndef MAX_THREAD_LIMIT
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#define MAX_THREAD_LIMIT 100000
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#endif
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#define MPM_CHILD_PID(i) (ap_scoreboard_image->parent[i].pid)
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#if !APR_VERSION_AT_LEAST(1,4,0)
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#define apr_time_from_msec(x) (x * 1000)
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#endif
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#ifndef MAX_SECS_TO_LINGER
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#define MAX_SECS_TO_LINGER 30
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#endif
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#define SECONDS_TO_LINGER 2
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/*
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* Actual definitions of config globals
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*/
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#ifndef DEFAULT_WORKER_FACTOR
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#define DEFAULT_WORKER_FACTOR 2
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#endif
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#define WORKER_FACTOR_SCALE 16 /* scale factor to allow fractional values */
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static unsigned int worker_factor = DEFAULT_WORKER_FACTOR * WORKER_FACTOR_SCALE;
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static int threads_per_child = 0; /* Worker threads per child */
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static int ap_daemons_to_start = 0;
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static int min_spare_threads = 0;
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static int max_spare_threads = 0;
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static int ap_daemons_limit = 0;
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static int max_workers = 0;
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static int server_limit = 0;
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static int thread_limit = 0;
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static int had_healthy_child = 0;
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static int dying = 0;
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static int workers_may_exit = 0;
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static int start_thread_may_exit = 0;
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static int listener_may_exit = 0;
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static int num_listensocks = 0;
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static apr_int32_t conns_this_child; /* MaxConnectionsPerChild, only access
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in listener thread */
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static apr_uint32_t connection_count = 0; /* Number of open connections */
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static apr_uint32_t lingering_count = 0; /* Number of connections in lingering close */
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static apr_uint32_t suspended_count = 0; /* Number of suspended connections */
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static apr_uint32_t clogged_count = 0; /* Number of threads processing ssl conns */
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static int resource_shortage = 0;
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static fd_queue_t *worker_queue;
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static fd_queue_info_t *worker_queue_info;
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static int mpm_state = AP_MPMQ_STARTING;
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static apr_thread_mutex_t *timeout_mutex;
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module AP_MODULE_DECLARE_DATA mpm_event_module;
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struct event_conn_state_t {
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/** APR_RING of expiration timeouts */
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APR_RING_ENTRY(event_conn_state_t) timeout_list;
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/** the expiration time of the next keepalive timeout */
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apr_time_t expiration_time;
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/** connection record this struct refers to */
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conn_rec *c;
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/** request record (if any) this struct refers to */
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request_rec *r;
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/** is the current conn_rec suspended? (disassociated with
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* a particular MPM thread; for suspend_/resume_connection
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* hooks)
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*/
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int suspended;
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/** memory pool to allocate from */
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apr_pool_t *p;
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/** bucket allocator */
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apr_bucket_alloc_t *bucket_alloc;
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/** poll file descriptor information */
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apr_pollfd_t pfd;
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/** public parts of the connection state */
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conn_state_t pub;
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};
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APR_RING_HEAD(timeout_head_t, event_conn_state_t);
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struct timeout_queue {
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struct timeout_head_t head;
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int count;
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const char *tag;
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};
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/*
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* Several timeout queues that use different timeouts, so that we always can
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* simply append to the end.
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* write_completion_q uses TimeOut
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* keepalive_q uses KeepAliveTimeOut
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* linger_q uses MAX_SECS_TO_LINGER
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* short_linger_q uses SECONDS_TO_LINGER
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*/
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static struct timeout_queue write_completion_q, keepalive_q, linger_q,
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short_linger_q;
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static apr_pollfd_t *listener_pollfd;
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/*
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* Macros for accessing struct timeout_queue.
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* For TO_QUEUE_APPEND and TO_QUEUE_REMOVE, timeout_mutex must be held.
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*/
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#define TO_QUEUE_APPEND(q, el) \
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do { \
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APR_RING_INSERT_TAIL(&(q).head, el, event_conn_state_t, timeout_list); \
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(q).count++; \
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} while (0)
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#define TO_QUEUE_REMOVE(q, el) \
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do { \
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APR_RING_REMOVE(el, timeout_list); \
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(q).count--; \
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} while (0)
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#define TO_QUEUE_INIT(q) \
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do { \
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APR_RING_INIT(&(q).head, event_conn_state_t, timeout_list); \
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(q).tag = #q; \
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} while (0)
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#define TO_QUEUE_ELEM_INIT(el) APR_RING_ELEM_INIT(el, timeout_list)
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/*
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* The pollset for sockets that are in any of the timeout queues. Currently
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* we use the timeout_mutex to make sure that connections are added/removed
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* atomically to/from both event_pollset and a timeout queue. Otherwise
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* some confusion can happen under high load if timeout queues and pollset
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* get out of sync.
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* XXX: It should be possible to make the lock unnecessary in many or even all
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* XXX: cases.
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*/
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static apr_pollset_t *event_pollset;
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#if HAVE_SERF
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typedef struct {
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apr_pollset_t *pollset;
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apr_pool_t *pool;
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} s_baton_t;
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static serf_context_t *g_serf;
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#endif
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/* The structure used to pass unique initialization info to each thread */
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typedef struct
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{
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int pid;
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int tid;
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int sd;
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} proc_info;
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/* Structure used to pass information to the thread responsible for
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* creating the rest of the threads.
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*/
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typedef struct
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{
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apr_thread_t **threads;
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apr_thread_t *listener;
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int child_num_arg;
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apr_threadattr_t *threadattr;
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} thread_starter;
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typedef enum
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{
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PT_CSD,
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PT_ACCEPT
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#if HAVE_SERF
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, PT_SERF
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#endif
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, PT_USER
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} poll_type_e;
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typedef struct
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{
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poll_type_e type;
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void *baton;
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} listener_poll_type;
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typedef struct
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{
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ap_mpm_callback_fn_t *cbfunc;
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void *user_baton;
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apr_pollfd_t **pfds;
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int nsock;
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timer_event_t *cancel_event; /* If a timeout was requested, a pointer to the timer event */
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unsigned int signaled:1;
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} socket_callback_baton_t;
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/* data retained by event across load/unload of the module
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* allocated on first call to pre-config hook; located on
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* subsequent calls to pre-config hook
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*/
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typedef struct event_retained_data {
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int first_server_limit;
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int first_thread_limit;
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int module_loads;
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int sick_child_detected;
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ap_generation_t my_generation;
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int volatile is_graceful; /* set from signal handler */
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int maxclients_reported;
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/*
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* The max child slot ever assigned, preserved across restarts. Necessary
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* to deal with MaxRequestWorkers changes across AP_SIG_GRACEFUL restarts.
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* We use this value to optimize routines that have to scan the entire
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* scoreboard.
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*/
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int max_daemons_limit;
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/*
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* idle_spawn_rate is the number of children that will be spawned on the
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* next maintenance cycle if there aren't enough idle servers. It is
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* maintained per listeners bucket, doubled up to MAX_SPAWN_RATE, and
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* reset only when a cycle goes by without the need to spawn.
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*/
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int *idle_spawn_rate;
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#ifndef MAX_SPAWN_RATE
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#define MAX_SPAWN_RATE (32)
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#endif
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int hold_off_on_exponential_spawning;
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/*
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* Current number of listeners buckets and maximum reached accross
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* restarts (to size retained data according to dynamic num_buckets,
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* eg. idle_spawn_rate).
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*/
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int num_buckets, max_buckets;
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} event_retained_data;
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static event_retained_data *retained;
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typedef struct event_child_bucket {
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ap_pod_t *pod;
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ap_listen_rec *listeners;
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} event_child_bucket;
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static event_child_bucket *all_buckets, /* All listeners buckets */
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*my_bucket; /* Current child bucket */
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#define ID_FROM_CHILD_THREAD(c, t) ((c * thread_limit) + t)
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/* The event MPM respects a couple of runtime flags that can aid
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* in debugging. Setting the -DNO_DETACH flag will prevent the root process
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* from detaching from its controlling terminal. Additionally, setting
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* the -DONE_PROCESS flag (which implies -DNO_DETACH) will get you the
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* child_main loop running in the process which originally started up.
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* This gives you a pretty nice debugging environment. (You'll get a SIGHUP
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* early in standalone_main; just continue through. This is the server
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* trying to kill off any child processes which it might have lying
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* around --- Apache doesn't keep track of their pids, it just sends
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* SIGHUP to the process group, ignoring it in the root process.
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* Continue through and you'll be fine.).
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*/
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static int one_process = 0;
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#ifdef DEBUG_SIGSTOP
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int raise_sigstop_flags;
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#endif
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static apr_pool_t *pconf; /* Pool for config stuff */
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static apr_pool_t *pchild; /* Pool for httpd child stuff */
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static pid_t ap_my_pid; /* Linux getpid() doesn't work except in main
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thread. Use this instead */
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static pid_t parent_pid;
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static apr_os_thread_t *listener_os_thread;
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/* The LISTENER_SIGNAL signal will be sent from the main thread to the
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* listener thread to wake it up for graceful termination (what a child
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* process from an old generation does when the admin does "apachectl
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* graceful"). This signal will be blocked in all threads of a child
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* process except for the listener thread.
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*/
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#define LISTENER_SIGNAL SIGHUP
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/* An array of socket descriptors in use by each thread used to
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* perform a non-graceful (forced) shutdown of the server.
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*/
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static apr_socket_t **worker_sockets;
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static void disable_listensocks(int process_slot)
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{
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int i;
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for (i = 0; i < num_listensocks; i++) {
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apr_pollset_remove(event_pollset, &listener_pollfd[i]);
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}
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ap_scoreboard_image->parent[process_slot].not_accepting = 1;
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}
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static void enable_listensocks(int process_slot)
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{
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int i;
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00457)
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"Accepting new connections again: "
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"%u active conns (%u lingering/%u clogged/%u suspended), "
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"%u idle workers",
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apr_atomic_read32(&connection_count),
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apr_atomic_read32(&lingering_count),
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apr_atomic_read32(&clogged_count),
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apr_atomic_read32(&suspended_count),
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ap_queue_info_get_idlers(worker_queue_info));
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for (i = 0; i < num_listensocks; i++)
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apr_pollset_add(event_pollset, &listener_pollfd[i]);
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/*
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* XXX: This is not yet optimal. If many workers suddenly become available,
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* XXX: the parent may kill some processes off too soon.
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*/
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ap_scoreboard_image->parent[process_slot].not_accepting = 0;
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}
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static void close_worker_sockets(void)
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{
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int i;
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for (i = 0; i < threads_per_child; i++) {
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if (worker_sockets[i]) {
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apr_socket_close(worker_sockets[i]);
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worker_sockets[i] = NULL;
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}
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}
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}
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static void wakeup_listener(void)
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{
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listener_may_exit = 1;
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if (!listener_os_thread) {
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/* XXX there is an obscure path that this doesn't handle perfectly:
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* right after listener thread is created but before
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* listener_os_thread is set, the first worker thread hits an
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* error and starts graceful termination
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*/
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return;
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}
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/* unblock the listener if it's waiting for a worker */
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ap_queue_info_term(worker_queue_info);
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/*
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* we should just be able to "kill(ap_my_pid, LISTENER_SIGNAL)" on all
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* platforms and wake up the listener thread since it is the only thread
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* with SIGHUP unblocked, but that doesn't work on Linux
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*/
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#ifdef HAVE_PTHREAD_KILL
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pthread_kill(*listener_os_thread, LISTENER_SIGNAL);
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#else
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kill(ap_my_pid, LISTENER_SIGNAL);
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#endif
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}
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#define ST_INIT 0
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|
#define ST_GRACEFUL 1
|
|
#define ST_UNGRACEFUL 2
|
|
|
|
static int terminate_mode = ST_INIT;
|
|
|
|
static void signal_threads(int mode)
|
|
{
|
|
if (terminate_mode == mode) {
|
|
return;
|
|
}
|
|
terminate_mode = mode;
|
|
mpm_state = AP_MPMQ_STOPPING;
|
|
|
|
/* in case we weren't called from the listener thread, wake up the
|
|
* listener thread
|
|
*/
|
|
wakeup_listener();
|
|
|
|
/* for ungraceful termination, let the workers exit now;
|
|
* for graceful termination, the listener thread will notify the
|
|
* workers to exit once it has stopped accepting new connections
|
|
*/
|
|
if (mode == ST_UNGRACEFUL) {
|
|
workers_may_exit = 1;
|
|
ap_queue_interrupt_all(worker_queue);
|
|
close_worker_sockets(); /* forcefully kill all current connections */
|
|
}
|
|
}
|
|
|
|
static int event_query(int query_code, int *result, apr_status_t *rv)
|
|
{
|
|
*rv = APR_SUCCESS;
|
|
switch (query_code) {
|
|
case AP_MPMQ_MAX_DAEMON_USED:
|
|
*result = retained->max_daemons_limit;
|
|
break;
|
|
case AP_MPMQ_IS_THREADED:
|
|
*result = AP_MPMQ_STATIC;
|
|
break;
|
|
case AP_MPMQ_IS_FORKED:
|
|
*result = AP_MPMQ_DYNAMIC;
|
|
break;
|
|
case AP_MPMQ_IS_ASYNC:
|
|
*result = 1;
|
|
break;
|
|
case AP_MPMQ_HAS_SERF:
|
|
*result = 1;
|
|
break;
|
|
case AP_MPMQ_HARD_LIMIT_DAEMONS:
|
|
*result = server_limit;
|
|
break;
|
|
case AP_MPMQ_HARD_LIMIT_THREADS:
|
|
*result = thread_limit;
|
|
break;
|
|
case AP_MPMQ_MAX_THREADS:
|
|
*result = threads_per_child;
|
|
break;
|
|
case AP_MPMQ_MIN_SPARE_DAEMONS:
|
|
*result = 0;
|
|
break;
|
|
case AP_MPMQ_MIN_SPARE_THREADS:
|
|
*result = min_spare_threads;
|
|
break;
|
|
case AP_MPMQ_MAX_SPARE_DAEMONS:
|
|
*result = 0;
|
|
break;
|
|
case AP_MPMQ_MAX_SPARE_THREADS:
|
|
*result = max_spare_threads;
|
|
break;
|
|
case AP_MPMQ_MAX_REQUESTS_DAEMON:
|
|
*result = ap_max_requests_per_child;
|
|
break;
|
|
case AP_MPMQ_MAX_DAEMONS:
|
|
*result = ap_daemons_limit;
|
|
break;
|
|
case AP_MPMQ_MPM_STATE:
|
|
*result = mpm_state;
|
|
break;
|
|
case AP_MPMQ_GENERATION:
|
|
*result = retained->my_generation;
|
|
break;
|
|
case AP_MPMQ_CAN_SUSPEND:
|
|
*result = 1;
|
|
break;
|
|
default:
|
|
*rv = APR_ENOTIMPL;
|
|
break;
|
|
}
|
|
return OK;
|
|
}
|
|
|
|
static void event_note_child_killed(int childnum, pid_t pid, ap_generation_t gen)
|
|
{
|
|
if (childnum != -1) { /* child had a scoreboard slot? */
|
|
ap_run_child_status(ap_server_conf,
|
|
ap_scoreboard_image->parent[childnum].pid,
|
|
ap_scoreboard_image->parent[childnum].generation,
|
|
childnum, MPM_CHILD_EXITED);
|
|
ap_scoreboard_image->parent[childnum].pid = 0;
|
|
}
|
|
else {
|
|
ap_run_child_status(ap_server_conf, pid, gen, -1, MPM_CHILD_EXITED);
|
|
}
|
|
}
|
|
|
|
static void event_note_child_started(int slot, pid_t pid)
|
|
{
|
|
ap_scoreboard_image->parent[slot].pid = pid;
|
|
ap_run_child_status(ap_server_conf,
|
|
ap_scoreboard_image->parent[slot].pid,
|
|
retained->my_generation, slot, MPM_CHILD_STARTED);
|
|
}
|
|
|
|
static void event_note_child_lost_slot(int slot, pid_t newpid)
|
|
{
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00458)
|
|
"pid %" APR_PID_T_FMT " taking over scoreboard slot from "
|
|
"%" APR_PID_T_FMT "%s",
|
|
newpid,
|
|
ap_scoreboard_image->parent[slot].pid,
|
|
ap_scoreboard_image->parent[slot].quiescing ?
|
|
" (quiescing)" : "");
|
|
ap_run_child_status(ap_server_conf,
|
|
ap_scoreboard_image->parent[slot].pid,
|
|
ap_scoreboard_image->parent[slot].generation,
|
|
slot, MPM_CHILD_LOST_SLOT);
|
|
/* Don't forget about this exiting child process, or we
|
|
* won't be able to kill it if it doesn't exit by the
|
|
* time the server is shut down.
|
|
*/
|
|
ap_register_extra_mpm_process(ap_scoreboard_image->parent[slot].pid,
|
|
ap_scoreboard_image->parent[slot].generation);
|
|
}
|
|
|
|
static const char *event_get_name(void)
|
|
{
|
|
return "event";
|
|
}
|
|
|
|
/* a clean exit from a child with proper cleanup */
|
|
static void clean_child_exit(int code) __attribute__ ((noreturn));
|
|
static void clean_child_exit(int code)
|
|
{
|
|
mpm_state = AP_MPMQ_STOPPING;
|
|
if (pchild) {
|
|
apr_pool_destroy(pchild);
|
|
}
|
|
|
|
if (one_process) {
|
|
event_note_child_killed(/* slot */ 0, 0, 0);
|
|
}
|
|
|
|
exit(code);
|
|
}
|
|
|
|
static void just_die(int sig)
|
|
{
|
|
clean_child_exit(0);
|
|
}
|
|
|
|
/*****************************************************************
|
|
* Connection structures and accounting...
|
|
*/
|
|
|
|
static int child_fatal;
|
|
|
|
/* volatile because they're updated from a signal handler */
|
|
static int volatile shutdown_pending;
|
|
static int volatile restart_pending;
|
|
|
|
static apr_status_t decrement_connection_count(void *cs_)
|
|
{
|
|
event_conn_state_t *cs = cs_;
|
|
switch (cs->pub.state) {
|
|
case CONN_STATE_LINGER_NORMAL:
|
|
case CONN_STATE_LINGER_SHORT:
|
|
apr_atomic_dec32(&lingering_count);
|
|
break;
|
|
case CONN_STATE_SUSPENDED:
|
|
apr_atomic_dec32(&suspended_count);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
apr_atomic_dec32(&connection_count);
|
|
return APR_SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* ap_start_shutdown() and ap_start_restart(), below, are a first stab at
|
|
* functions to initiate shutdown or restart without relying on signals.
|
|
* Previously this was initiated in sig_term() and restart() signal handlers,
|
|
* but we want to be able to start a shutdown/restart from other sources --
|
|
* e.g. on Win32, from the service manager. Now the service manager can
|
|
* call ap_start_shutdown() or ap_start_restart() as appropriate. Note that
|
|
* these functions can also be called by the child processes, since global
|
|
* variables are no longer used to pass on the required action to the parent.
|
|
*
|
|
* These should only be called from the parent process itself, since the
|
|
* parent process will use the shutdown_pending and restart_pending variables
|
|
* to determine whether to shutdown or restart. The child process should
|
|
* call signal_parent() directly to tell the parent to die -- this will
|
|
* cause neither of those variable to be set, which the parent will
|
|
* assume means something serious is wrong (which it will be, for the
|
|
* child to force an exit) and so do an exit anyway.
|
|
*/
|
|
|
|
static void ap_start_shutdown(int graceful)
|
|
{
|
|
mpm_state = AP_MPMQ_STOPPING;
|
|
if (shutdown_pending == 1) {
|
|
/* Um, is this _probably_ not an error, if the user has
|
|
* tried to do a shutdown twice quickly, so we won't
|
|
* worry about reporting it.
|
|
*/
|
|
return;
|
|
}
|
|
shutdown_pending = 1;
|
|
retained->is_graceful = graceful;
|
|
}
|
|
|
|
/* do a graceful restart if graceful == 1 */
|
|
static void ap_start_restart(int graceful)
|
|
{
|
|
mpm_state = AP_MPMQ_STOPPING;
|
|
if (restart_pending == 1) {
|
|
/* Probably not an error - don't bother reporting it */
|
|
return;
|
|
}
|
|
restart_pending = 1;
|
|
retained->is_graceful = graceful;
|
|
}
|
|
|
|
static void sig_term(int sig)
|
|
{
|
|
ap_start_shutdown(sig == AP_SIG_GRACEFUL_STOP);
|
|
}
|
|
|
|
static void restart(int sig)
|
|
{
|
|
ap_start_restart(sig == AP_SIG_GRACEFUL);
|
|
}
|
|
|
|
static void set_signals(void)
|
|
{
|
|
#ifndef NO_USE_SIGACTION
|
|
struct sigaction sa;
|
|
#endif
|
|
|
|
if (!one_process) {
|
|
ap_fatal_signal_setup(ap_server_conf, pconf);
|
|
}
|
|
|
|
#ifndef NO_USE_SIGACTION
|
|
sigemptyset(&sa.sa_mask);
|
|
sa.sa_flags = 0;
|
|
|
|
sa.sa_handler = sig_term;
|
|
if (sigaction(SIGTERM, &sa, NULL) < 0)
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00459)
|
|
"sigaction(SIGTERM)");
|
|
#ifdef AP_SIG_GRACEFUL_STOP
|
|
if (sigaction(AP_SIG_GRACEFUL_STOP, &sa, NULL) < 0)
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00460)
|
|
"sigaction(" AP_SIG_GRACEFUL_STOP_STRING ")");
|
|
#endif
|
|
#ifdef SIGINT
|
|
if (sigaction(SIGINT, &sa, NULL) < 0)
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00461)
|
|
"sigaction(SIGINT)");
|
|
#endif
|
|
#ifdef SIGXCPU
|
|
sa.sa_handler = SIG_DFL;
|
|
if (sigaction(SIGXCPU, &sa, NULL) < 0)
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00462)
|
|
"sigaction(SIGXCPU)");
|
|
#endif
|
|
#ifdef SIGXFSZ
|
|
/* For systems following the LFS standard, ignoring SIGXFSZ allows
|
|
* a write() beyond the 2GB limit to fail gracefully with E2BIG
|
|
* rather than terminate the process. */
|
|
sa.sa_handler = SIG_IGN;
|
|
if (sigaction(SIGXFSZ, &sa, NULL) < 0)
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00463)
|
|
"sigaction(SIGXFSZ)");
|
|
#endif
|
|
#ifdef SIGPIPE
|
|
sa.sa_handler = SIG_IGN;
|
|
if (sigaction(SIGPIPE, &sa, NULL) < 0)
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00464)
|
|
"sigaction(SIGPIPE)");
|
|
#endif
|
|
|
|
/* we want to ignore HUPs and AP_SIG_GRACEFUL while we're busy
|
|
* processing one */
|
|
sigaddset(&sa.sa_mask, SIGHUP);
|
|
sigaddset(&sa.sa_mask, AP_SIG_GRACEFUL);
|
|
sa.sa_handler = restart;
|
|
if (sigaction(SIGHUP, &sa, NULL) < 0)
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00465)
|
|
"sigaction(SIGHUP)");
|
|
if (sigaction(AP_SIG_GRACEFUL, &sa, NULL) < 0)
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00466)
|
|
"sigaction(" AP_SIG_GRACEFUL_STRING ")");
|
|
#else
|
|
if (!one_process) {
|
|
#ifdef SIGXCPU
|
|
apr_signal(SIGXCPU, SIG_DFL);
|
|
#endif /* SIGXCPU */
|
|
#ifdef SIGXFSZ
|
|
apr_signal(SIGXFSZ, SIG_IGN);
|
|
#endif /* SIGXFSZ */
|
|
}
|
|
|
|
apr_signal(SIGTERM, sig_term);
|
|
#ifdef SIGHUP
|
|
apr_signal(SIGHUP, restart);
|
|
#endif /* SIGHUP */
|
|
#ifdef AP_SIG_GRACEFUL
|
|
apr_signal(AP_SIG_GRACEFUL, restart);
|
|
#endif /* AP_SIG_GRACEFUL */
|
|
#ifdef AP_SIG_GRACEFUL_STOP
|
|
apr_signal(AP_SIG_GRACEFUL_STOP, sig_term);
|
|
#endif /* AP_SIG_GRACEFUL_STOP */
|
|
#ifdef SIGPIPE
|
|
apr_signal(SIGPIPE, SIG_IGN);
|
|
#endif /* SIGPIPE */
|
|
|
|
#endif
|
|
}
|
|
|
|
static void notify_suspend(event_conn_state_t *cs)
|
|
{
|
|
ap_run_suspend_connection(cs->c, cs->r);
|
|
cs->suspended = 1;
|
|
}
|
|
|
|
static void notify_resume(event_conn_state_t *cs)
|
|
{
|
|
cs->suspended = 0;
|
|
ap_run_resume_connection(cs->c, cs->r);
|
|
}
|
|
|
|
static int start_lingering_close_common(event_conn_state_t *cs, int in_worker)
|
|
{
|
|
apr_status_t rv;
|
|
struct timeout_queue *q;
|
|
apr_socket_t *csd = cs->pfd.desc.s;
|
|
#ifdef AP_DEBUG
|
|
{
|
|
rv = apr_socket_timeout_set(csd, 0);
|
|
AP_DEBUG_ASSERT(rv == APR_SUCCESS);
|
|
}
|
|
#else
|
|
apr_socket_timeout_set(csd, 0);
|
|
#endif
|
|
/*
|
|
* If some module requested a shortened waiting period, only wait for
|
|
* 2s (SECONDS_TO_LINGER). This is useful for mitigating certain
|
|
* DoS attacks.
|
|
*/
|
|
if (apr_table_get(cs->c->notes, "short-lingering-close")) {
|
|
cs->expiration_time =
|
|
apr_time_now() + apr_time_from_sec(SECONDS_TO_LINGER);
|
|
q = &short_linger_q;
|
|
cs->pub.state = CONN_STATE_LINGER_SHORT;
|
|
}
|
|
else {
|
|
cs->expiration_time =
|
|
apr_time_now() + apr_time_from_sec(MAX_SECS_TO_LINGER);
|
|
q = &linger_q;
|
|
cs->pub.state = CONN_STATE_LINGER_NORMAL;
|
|
}
|
|
apr_atomic_inc32(&lingering_count);
|
|
cs->c->sbh = NULL;
|
|
if (in_worker) {
|
|
notify_suspend(cs);
|
|
}
|
|
apr_thread_mutex_lock(timeout_mutex);
|
|
TO_QUEUE_APPEND(*q, cs);
|
|
cs->pfd.reqevents = (
|
|
cs->pub.sense == CONN_SENSE_WANT_WRITE ? APR_POLLOUT :
|
|
APR_POLLIN) | APR_POLLHUP | APR_POLLERR;
|
|
cs->pub.sense = CONN_SENSE_DEFAULT;
|
|
rv = apr_pollset_add(event_pollset, &cs->pfd);
|
|
apr_thread_mutex_unlock(timeout_mutex);
|
|
if (rv != APR_SUCCESS && !APR_STATUS_IS_EEXIST(rv)) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf,
|
|
"start_lingering_close: apr_pollset_add failure");
|
|
apr_thread_mutex_lock(timeout_mutex);
|
|
TO_QUEUE_REMOVE(*q, cs);
|
|
apr_thread_mutex_unlock(timeout_mutex);
|
|
apr_socket_close(cs->pfd.desc.s);
|
|
ap_push_pool(worker_queue_info, cs->p);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Close our side of the connection, flushing data to the client first.
|
|
* Pre-condition: cs is not in any timeout queue and not in the pollset,
|
|
* timeout_mutex is not locked
|
|
* return: 0 if connection is fully closed,
|
|
* 1 if connection is lingering
|
|
* May only be called by worker thread.
|
|
*/
|
|
static int start_lingering_close_blocking(event_conn_state_t *cs)
|
|
{
|
|
if (ap_start_lingering_close(cs->c)) {
|
|
cs->c->sbh = NULL;
|
|
notify_suspend(cs);
|
|
ap_push_pool(worker_queue_info, cs->p);
|
|
return 0;
|
|
}
|
|
return start_lingering_close_common(cs, 1);
|
|
}
|
|
|
|
/*
|
|
* Close our side of the connection, NOT flushing data to the client.
|
|
* This should only be called if there has been an error or if we know
|
|
* that our send buffers are empty.
|
|
* Pre-condition: cs is not in any timeout queue and not in the pollset,
|
|
* timeout_mutex is not locked
|
|
* return: 0 if connection is fully closed,
|
|
* 1 if connection is lingering
|
|
* may be called by listener thread
|
|
*/
|
|
static int start_lingering_close_nonblocking(event_conn_state_t *cs)
|
|
{
|
|
conn_rec *c = cs->c;
|
|
apr_socket_t *csd = cs->pfd.desc.s;
|
|
|
|
if (c->aborted
|
|
|| ap_shutdown_conn(c, 0) != APR_SUCCESS || c->aborted
|
|
|| apr_socket_shutdown(csd, APR_SHUTDOWN_WRITE) != APR_SUCCESS) {
|
|
apr_socket_close(csd);
|
|
ap_push_pool(worker_queue_info, cs->p);
|
|
return 0;
|
|
}
|
|
return start_lingering_close_common(cs, 0);
|
|
}
|
|
|
|
/*
|
|
* forcibly close a lingering connection after the lingering period has
|
|
* expired
|
|
* Pre-condition: cs is not in any timeout queue and not in the pollset
|
|
* return: irrelevant (need same prototype as start_lingering_close)
|
|
*/
|
|
static int stop_lingering_close(event_conn_state_t *cs)
|
|
{
|
|
apr_status_t rv;
|
|
apr_socket_t *csd = ap_get_conn_socket(cs->c);
|
|
ap_log_error(APLOG_MARK, APLOG_TRACE4, 0, ap_server_conf,
|
|
"socket reached timeout in lingering-close state");
|
|
rv = apr_socket_close(csd);
|
|
if (rv != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, APLOGNO(00468) "error closing socket");
|
|
AP_DEBUG_ASSERT(0);
|
|
}
|
|
ap_push_pool(worker_queue_info, cs->p);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This runs before any non-MPM cleanup code on the connection;
|
|
* if the connection is currently suspended as far as modules
|
|
* know, provide notification of resumption.
|
|
*/
|
|
static apr_status_t ptrans_pre_cleanup(void *dummy)
|
|
{
|
|
event_conn_state_t *cs = dummy;
|
|
|
|
if (cs->suspended) {
|
|
notify_resume(cs);
|
|
}
|
|
return APR_SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* event_pre_read_request() and event_request_cleanup() track the
|
|
* current r for a given connection.
|
|
*/
|
|
static apr_status_t event_request_cleanup(void *dummy)
|
|
{
|
|
conn_rec *c = dummy;
|
|
event_conn_state_t *cs = ap_get_module_config(c->conn_config,
|
|
&mpm_event_module);
|
|
|
|
cs->r = NULL;
|
|
return APR_SUCCESS;
|
|
}
|
|
|
|
static void event_pre_read_request(request_rec *r, conn_rec *c)
|
|
{
|
|
event_conn_state_t *cs = ap_get_module_config(c->conn_config,
|
|
&mpm_event_module);
|
|
|
|
cs->r = r;
|
|
apr_pool_cleanup_register(r->pool, c, event_request_cleanup,
|
|
apr_pool_cleanup_null);
|
|
}
|
|
|
|
/*
|
|
* process one connection in the worker
|
|
*/
|
|
static void process_socket(apr_thread_t *thd, apr_pool_t * p, apr_socket_t * sock,
|
|
event_conn_state_t * cs, int my_child_num,
|
|
int my_thread_num)
|
|
{
|
|
conn_rec *c;
|
|
long conn_id = ID_FROM_CHILD_THREAD(my_child_num, my_thread_num);
|
|
int rc;
|
|
ap_sb_handle_t *sbh;
|
|
|
|
/* XXX: This will cause unbounded mem usage for long lasting connections */
|
|
ap_create_sb_handle(&sbh, p, my_child_num, my_thread_num);
|
|
|
|
if (cs == NULL) { /* This is a new connection */
|
|
listener_poll_type *pt = apr_pcalloc(p, sizeof(*pt));
|
|
cs = apr_pcalloc(p, sizeof(event_conn_state_t));
|
|
cs->bucket_alloc = apr_bucket_alloc_create(p);
|
|
c = ap_run_create_connection(p, ap_server_conf, sock,
|
|
conn_id, sbh, cs->bucket_alloc);
|
|
if (!c) {
|
|
ap_push_pool(worker_queue_info, p);
|
|
return;
|
|
}
|
|
apr_atomic_inc32(&connection_count);
|
|
apr_pool_cleanup_register(c->pool, cs, decrement_connection_count,
|
|
apr_pool_cleanup_null);
|
|
ap_set_module_config(c->conn_config, &mpm_event_module, cs);
|
|
c->current_thread = thd;
|
|
cs->c = c;
|
|
c->cs = &(cs->pub);
|
|
cs->p = p;
|
|
cs->pfd.desc_type = APR_POLL_SOCKET;
|
|
cs->pfd.reqevents = APR_POLLIN;
|
|
cs->pfd.desc.s = sock;
|
|
pt->type = PT_CSD;
|
|
pt->baton = cs;
|
|
cs->pfd.client_data = pt;
|
|
apr_pool_pre_cleanup_register(p, cs, ptrans_pre_cleanup);
|
|
TO_QUEUE_ELEM_INIT(cs);
|
|
|
|
ap_update_vhost_given_ip(c);
|
|
|
|
rc = ap_run_pre_connection(c, sock);
|
|
if (rc != OK && rc != DONE) {
|
|
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(00469)
|
|
"process_socket: connection aborted");
|
|
c->aborted = 1;
|
|
}
|
|
|
|
/**
|
|
* XXX If the platform does not have a usable way of bundling
|
|
* accept() with a socket readability check, like Win32,
|
|
* and there are measurable delays before the
|
|
* socket is readable due to the first data packet arriving,
|
|
* it might be better to create the cs on the listener thread
|
|
* with the state set to CONN_STATE_CHECK_REQUEST_LINE_READABLE
|
|
*
|
|
* FreeBSD users will want to enable the HTTP accept filter
|
|
* module in their kernel for the highest performance
|
|
* When the accept filter is active, sockets are kept in the
|
|
* kernel until a HTTP request is received.
|
|
*/
|
|
cs->pub.state = CONN_STATE_READ_REQUEST_LINE;
|
|
|
|
cs->pub.sense = CONN_SENSE_DEFAULT;
|
|
}
|
|
else {
|
|
c = cs->c;
|
|
c->sbh = sbh;
|
|
notify_resume(cs);
|
|
c->current_thread = thd;
|
|
/* Subsequent request on a conn, and thread number is part of ID */
|
|
c->id = conn_id;
|
|
}
|
|
|
|
if (c->clogging_input_filters && !c->aborted) {
|
|
/* Since we have an input filter which 'clogs' the input stream,
|
|
* like mod_ssl used to, lets just do the normal read from input
|
|
* filters, like the Worker MPM does. Filters that need to write
|
|
* where they would otherwise read, or read where they would
|
|
* otherwise write, should set the sense appropriately.
|
|
*/
|
|
apr_atomic_inc32(&clogged_count);
|
|
ap_run_process_connection(c);
|
|
if (cs->pub.state != CONN_STATE_SUSPENDED) {
|
|
cs->pub.state = CONN_STATE_LINGER;
|
|
}
|
|
apr_atomic_dec32(&clogged_count);
|
|
}
|
|
|
|
read_request:
|
|
if (cs->pub.state == CONN_STATE_READ_REQUEST_LINE) {
|
|
if (!c->aborted) {
|
|
ap_run_process_connection(c);
|
|
|
|
/* state will be updated upon return
|
|
* fall thru to either wait for readability/timeout or
|
|
* do lingering close
|
|
*/
|
|
}
|
|
else {
|
|
cs->pub.state = CONN_STATE_LINGER;
|
|
}
|
|
}
|
|
|
|
if (cs->pub.state == CONN_STATE_WRITE_COMPLETION) {
|
|
ap_filter_t *output_filter = c->output_filters;
|
|
apr_status_t rv;
|
|
ap_update_child_status_from_conn(sbh, SERVER_BUSY_WRITE, c);
|
|
while (output_filter->next != NULL) {
|
|
output_filter = output_filter->next;
|
|
}
|
|
rv = output_filter->frec->filter_func.out_func(output_filter, NULL);
|
|
if (rv != APR_SUCCESS) {
|
|
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, rv, c, APLOGNO(00470)
|
|
"network write failure in core output filter");
|
|
cs->pub.state = CONN_STATE_LINGER;
|
|
}
|
|
else if (c->data_in_output_filters) {
|
|
/* Still in WRITE_COMPLETION_STATE:
|
|
* Set a write timeout for this connection, and let the
|
|
* event thread poll for writeability.
|
|
*/
|
|
cs->expiration_time = ap_server_conf->timeout + apr_time_now();
|
|
c->sbh = NULL;
|
|
notify_suspend(cs);
|
|
apr_thread_mutex_lock(timeout_mutex);
|
|
TO_QUEUE_APPEND(write_completion_q, cs);
|
|
cs->pfd.reqevents = (
|
|
cs->pub.sense == CONN_SENSE_WANT_READ ? APR_POLLIN :
|
|
APR_POLLOUT) | APR_POLLHUP | APR_POLLERR;
|
|
cs->pub.sense = CONN_SENSE_DEFAULT;
|
|
rc = apr_pollset_add(event_pollset, &cs->pfd);
|
|
apr_thread_mutex_unlock(timeout_mutex);
|
|
return;
|
|
}
|
|
else if (c->keepalive != AP_CONN_KEEPALIVE || c->aborted ||
|
|
listener_may_exit) {
|
|
cs->pub.state = CONN_STATE_LINGER;
|
|
}
|
|
else if (c->data_in_input_filters) {
|
|
cs->pub.state = CONN_STATE_READ_REQUEST_LINE;
|
|
goto read_request;
|
|
}
|
|
else {
|
|
cs->pub.state = CONN_STATE_CHECK_REQUEST_LINE_READABLE;
|
|
}
|
|
}
|
|
|
|
if (cs->pub.state == CONN_STATE_LINGER) {
|
|
start_lingering_close_blocking(cs);
|
|
}
|
|
else if (cs->pub.state == CONN_STATE_CHECK_REQUEST_LINE_READABLE) {
|
|
/* It greatly simplifies the logic to use a single timeout value here
|
|
* because the new element can just be added to the end of the list and
|
|
* it will stay sorted in expiration time sequence. If brand new
|
|
* sockets are sent to the event thread for a readability check, this
|
|
* will be a slight behavior change - they use the non-keepalive
|
|
* timeout today. With a normal client, the socket will be readable in
|
|
* a few milliseconds anyway.
|
|
*/
|
|
cs->expiration_time = ap_server_conf->keep_alive_timeout +
|
|
apr_time_now();
|
|
c->sbh = NULL;
|
|
notify_suspend(cs);
|
|
apr_thread_mutex_lock(timeout_mutex);
|
|
TO_QUEUE_APPEND(keepalive_q, cs);
|
|
|
|
/* Add work to pollset. */
|
|
cs->pfd.reqevents = APR_POLLIN;
|
|
rc = apr_pollset_add(event_pollset, &cs->pfd);
|
|
apr_thread_mutex_unlock(timeout_mutex);
|
|
|
|
if (rc != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, rc, ap_server_conf,
|
|
"process_socket: apr_pollset_add failure");
|
|
AP_DEBUG_ASSERT(rc == APR_SUCCESS);
|
|
}
|
|
}
|
|
else if (cs->pub.state == CONN_STATE_SUSPENDED) {
|
|
cs->c->suspended_baton = cs;
|
|
apr_atomic_inc32(&suspended_count);
|
|
c->sbh = NULL;
|
|
notify_suspend(cs);
|
|
}
|
|
}
|
|
|
|
/* Put a SUSPENDED connection back into a queue. */
|
|
static apr_status_t event_resume_suspended (conn_rec *c) {
|
|
event_conn_state_t* cs = (event_conn_state_t*) c->suspended_baton;
|
|
if (cs == NULL) {
|
|
ap_log_cerror (APLOG_MARK, LOG_WARNING, 0, c, APLOGNO(02615)
|
|
"event_resume_suspended: suspended_baton is NULL");
|
|
return APR_EGENERAL;
|
|
} else if (!cs->suspended) {
|
|
ap_log_cerror (APLOG_MARK, LOG_WARNING, 0, c, APLOGNO(02616)
|
|
"event_resume_suspended: Thread isn't suspended");
|
|
return APR_EGENERAL;
|
|
}
|
|
apr_atomic_dec32(&suspended_count);
|
|
c->suspended_baton = NULL;
|
|
|
|
apr_thread_mutex_lock(timeout_mutex);
|
|
TO_QUEUE_APPEND(write_completion_q, cs);
|
|
cs->pfd.reqevents = (
|
|
cs->pub.sense == CONN_SENSE_WANT_READ ? APR_POLLIN :
|
|
APR_POLLOUT) | APR_POLLHUP | APR_POLLERR;
|
|
cs->pub.sense = CONN_SENSE_DEFAULT;
|
|
apr_pollset_add(event_pollset, &cs->pfd);
|
|
apr_thread_mutex_unlock(timeout_mutex);
|
|
|
|
return OK;
|
|
}
|
|
|
|
/* conns_this_child has gone to zero or below. See if the admin coded
|
|
"MaxConnectionsPerChild 0", and keep going in that case. Doing it this way
|
|
simplifies the hot path in worker_thread */
|
|
static void check_infinite_requests(void)
|
|
{
|
|
if (ap_max_requests_per_child) {
|
|
ap_log_error(APLOG_MARK, APLOG_TRACE1, 0, ap_server_conf,
|
|
"Stopping process due to MaxConnectionsPerChild");
|
|
signal_threads(ST_GRACEFUL);
|
|
}
|
|
else {
|
|
/* keep going */
|
|
conns_this_child = APR_INT32_MAX;
|
|
}
|
|
}
|
|
|
|
static void close_listeners(int process_slot, int *closed)
|
|
{
|
|
if (!*closed) {
|
|
int i;
|
|
disable_listensocks(process_slot);
|
|
ap_close_listeners_ex(my_bucket->listeners);
|
|
*closed = 1;
|
|
dying = 1;
|
|
ap_scoreboard_image->parent[process_slot].quiescing = 1;
|
|
for (i = 0; i < threads_per_child; ++i) {
|
|
ap_update_child_status_from_indexes(process_slot, i,
|
|
SERVER_GRACEFUL, NULL);
|
|
}
|
|
/* wake up the main thread */
|
|
kill(ap_my_pid, SIGTERM);
|
|
}
|
|
}
|
|
|
|
static void unblock_signal(int sig)
|
|
{
|
|
sigset_t sig_mask;
|
|
|
|
sigemptyset(&sig_mask);
|
|
sigaddset(&sig_mask, sig);
|
|
#if defined(SIGPROCMASK_SETS_THREAD_MASK)
|
|
sigprocmask(SIG_UNBLOCK, &sig_mask, NULL);
|
|
#else
|
|
pthread_sigmask(SIG_UNBLOCK, &sig_mask, NULL);
|
|
#endif
|
|
}
|
|
|
|
static void dummy_signal_handler(int sig)
|
|
{
|
|
/* XXX If specifying SIG_IGN is guaranteed to unblock a syscall,
|
|
* then we don't need this goofy function.
|
|
*/
|
|
}
|
|
|
|
|
|
#if HAVE_SERF
|
|
static apr_status_t s_socket_add(void *user_baton,
|
|
apr_pollfd_t *pfd,
|
|
void *serf_baton)
|
|
{
|
|
s_baton_t *s = (s_baton_t*)user_baton;
|
|
/* XXXXX: recycle listener_poll_types */
|
|
listener_poll_type *pt = ap_malloc(sizeof(*pt));
|
|
pt->type = PT_SERF;
|
|
pt->baton = serf_baton;
|
|
pfd->client_data = pt;
|
|
return apr_pollset_add(s->pollset, pfd);
|
|
}
|
|
|
|
static apr_status_t s_socket_remove(void *user_baton,
|
|
apr_pollfd_t *pfd,
|
|
void *serf_baton)
|
|
{
|
|
s_baton_t *s = (s_baton_t*)user_baton;
|
|
listener_poll_type *pt = pfd->client_data;
|
|
free(pt);
|
|
return apr_pollset_remove(s->pollset, pfd);
|
|
}
|
|
#endif
|
|
|
|
static apr_status_t init_pollset(apr_pool_t *p)
|
|
{
|
|
#if HAVE_SERF
|
|
s_baton_t *baton = NULL;
|
|
#endif
|
|
ap_listen_rec *lr;
|
|
listener_poll_type *pt;
|
|
int i = 0;
|
|
|
|
TO_QUEUE_INIT(write_completion_q);
|
|
TO_QUEUE_INIT(keepalive_q);
|
|
TO_QUEUE_INIT(linger_q);
|
|
TO_QUEUE_INIT(short_linger_q);
|
|
|
|
listener_pollfd = apr_palloc(p, sizeof(apr_pollfd_t) * num_listensocks);
|
|
for (lr = my_bucket->listeners; lr != NULL; lr = lr->next, i++) {
|
|
apr_pollfd_t *pfd;
|
|
AP_DEBUG_ASSERT(i < num_listensocks);
|
|
pfd = &listener_pollfd[i];
|
|
pt = apr_pcalloc(p, sizeof(*pt));
|
|
pfd->desc_type = APR_POLL_SOCKET;
|
|
pfd->desc.s = lr->sd;
|
|
pfd->reqevents = APR_POLLIN;
|
|
|
|
pt->type = PT_ACCEPT;
|
|
pt->baton = lr;
|
|
|
|
pfd->client_data = pt;
|
|
|
|
apr_socket_opt_set(pfd->desc.s, APR_SO_NONBLOCK, 1);
|
|
apr_pollset_add(event_pollset, pfd);
|
|
|
|
lr->accept_func = ap_unixd_accept;
|
|
}
|
|
|
|
#if HAVE_SERF
|
|
baton = apr_pcalloc(p, sizeof(*baton));
|
|
baton->pollset = event_pollset;
|
|
/* TODO: subpools, threads, reuse, etc. -- currently use malloc() inside :( */
|
|
baton->pool = p;
|
|
|
|
g_serf = serf_context_create_ex(baton,
|
|
s_socket_add,
|
|
s_socket_remove, p);
|
|
|
|
ap_register_provider(p, "mpm_serf",
|
|
"instance", "0", g_serf);
|
|
|
|
#endif
|
|
|
|
return APR_SUCCESS;
|
|
}
|
|
|
|
static apr_status_t push_timer2worker(timer_event_t* te)
|
|
{
|
|
return ap_queue_push_timer(worker_queue, te);
|
|
}
|
|
|
|
/*
|
|
* Pre-condition: pfd->cs is neither in pollset nor timeout queue
|
|
* this function may only be called by the listener
|
|
*/
|
|
static apr_status_t push2worker(const apr_pollfd_t * pfd,
|
|
apr_pollset_t * pollset)
|
|
{
|
|
listener_poll_type *pt = (listener_poll_type *) pfd->client_data;
|
|
event_conn_state_t *cs = (event_conn_state_t *) pt->baton;
|
|
apr_status_t rc;
|
|
|
|
rc = ap_queue_push(worker_queue, cs->pfd.desc.s, cs, cs->p);
|
|
if (rc != APR_SUCCESS) {
|
|
/* trash the connection; we couldn't queue the connected
|
|
* socket to a worker
|
|
*/
|
|
apr_bucket_alloc_destroy(cs->bucket_alloc);
|
|
apr_socket_close(cs->pfd.desc.s);
|
|
ap_log_error(APLOG_MARK, APLOG_CRIT, rc,
|
|
ap_server_conf, APLOGNO(00471) "push2worker: ap_queue_push failed");
|
|
ap_push_pool(worker_queue_info, cs->p);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* get_worker:
|
|
* If *have_idle_worker_p == 0, reserve a worker thread, and set
|
|
* *have_idle_worker_p = 1.
|
|
* If *have_idle_worker_p is already 1, will do nothing.
|
|
* If blocking == 1, block if all workers are currently busy.
|
|
* If no worker was available immediately, will set *all_busy to 1.
|
|
* XXX: If there are no workers, we should not block immediately but
|
|
* XXX: close all keep-alive connections first.
|
|
*/
|
|
static void get_worker(int *have_idle_worker_p, int blocking, int *all_busy)
|
|
{
|
|
apr_status_t rc;
|
|
|
|
if (*have_idle_worker_p) {
|
|
/* already reserved a worker thread - must have hit a
|
|
* transient error on a previous pass
|
|
*/
|
|
return;
|
|
}
|
|
|
|
if (blocking)
|
|
rc = ap_queue_info_wait_for_idler(worker_queue_info, all_busy);
|
|
else
|
|
rc = ap_queue_info_try_get_idler(worker_queue_info);
|
|
|
|
if (rc == APR_SUCCESS || APR_STATUS_IS_EOF(rc)) {
|
|
*have_idle_worker_p = 1;
|
|
}
|
|
else if (!blocking && rc == APR_EAGAIN) {
|
|
*all_busy = 1;
|
|
}
|
|
else {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, rc, ap_server_conf, APLOGNO(00472)
|
|
"ap_queue_info_wait_for_idler failed. "
|
|
"Attempting to shutdown process gracefully");
|
|
signal_threads(ST_GRACEFUL);
|
|
}
|
|
}
|
|
|
|
/* Structures to reuse */
|
|
static APR_RING_HEAD(timer_free_ring_t, timer_event_t) timer_free_ring;
|
|
|
|
static apr_skiplist *timer_skiplist;
|
|
|
|
static int indexing_comp(void *a, void *b)
|
|
{
|
|
apr_time_t t1 = (apr_time_t) (((timer_event_t *) a)->when);
|
|
apr_time_t t2 = (apr_time_t) (((timer_event_t *) b)->when);
|
|
AP_DEBUG_ASSERT(t1);
|
|
AP_DEBUG_ASSERT(t2);
|
|
return ((t1 < t2) ? -1 : ((t1 > t2) ? 1 : 0));
|
|
}
|
|
|
|
static int indexing_compk(void *ac, void *b)
|
|
{
|
|
apr_time_t *t1 = (apr_time_t *) ac;
|
|
apr_time_t t2 = (apr_time_t) (((timer_event_t *) b)->when);
|
|
AP_DEBUG_ASSERT(t2);
|
|
return ((*t1 < t2) ? -1 : ((*t1 > t2) ? 1 : 0));
|
|
}
|
|
|
|
static apr_thread_mutex_t *g_timer_skiplist_mtx;
|
|
|
|
static timer_event_t * event_get_timer_event(apr_time_t t,
|
|
ap_mpm_callback_fn_t *cbfn,
|
|
void *baton,
|
|
int insert,
|
|
apr_pollfd_t **remove)
|
|
{
|
|
timer_event_t *te;
|
|
/* oh yeah, and make locking smarter/fine grained. */
|
|
|
|
apr_thread_mutex_lock(g_timer_skiplist_mtx);
|
|
|
|
if (!APR_RING_EMPTY(&timer_free_ring, timer_event_t, link)) {
|
|
te = APR_RING_FIRST(&timer_free_ring);
|
|
APR_RING_REMOVE(te, link);
|
|
}
|
|
else {
|
|
te = apr_skiplist_alloc(timer_skiplist, sizeof(timer_event_t));
|
|
APR_RING_ELEM_INIT(te, link);
|
|
}
|
|
|
|
te->cbfunc = cbfn;
|
|
te->baton = baton;
|
|
te->canceled = 0;
|
|
te->when = t;
|
|
te->remove = remove;
|
|
|
|
if (insert) {
|
|
/* Okay, insert sorted by when.. */
|
|
apr_skiplist_insert(timer_skiplist, (void *)te);
|
|
}
|
|
apr_thread_mutex_unlock(g_timer_skiplist_mtx);
|
|
|
|
return te;
|
|
}
|
|
|
|
static apr_status_t event_register_timed_callback_ex(apr_time_t t,
|
|
ap_mpm_callback_fn_t *cbfn,
|
|
void *baton,
|
|
apr_pollfd_t **remove)
|
|
{
|
|
event_get_timer_event(t + apr_time_now(), cbfn, baton, 1, remove);
|
|
return APR_SUCCESS;
|
|
}
|
|
|
|
static apr_status_t event_register_timed_callback(apr_time_t t,
|
|
ap_mpm_callback_fn_t *cbfn,
|
|
void *baton)
|
|
{
|
|
event_register_timed_callback_ex(t, cbfn, baton, NULL);
|
|
return APR_SUCCESS;
|
|
}
|
|
|
|
static apr_status_t event_register_socket_callback_ex(apr_socket_t **s,
|
|
apr_pool_t *p,
|
|
int for_read,
|
|
ap_mpm_callback_fn_t *cbfn,
|
|
ap_mpm_callback_fn_t *tofn,
|
|
void *baton,
|
|
apr_time_t timeout)
|
|
{
|
|
apr_status_t rc, final_rc= APR_SUCCESS;
|
|
int i = 0, nsock;
|
|
socket_callback_baton_t *scb = apr_pcalloc(p, sizeof(*scb));
|
|
listener_poll_type *pt = apr_palloc(p, sizeof(*pt));
|
|
apr_pollfd_t **pfds = NULL;
|
|
|
|
while(s[i] != NULL) {
|
|
i++;
|
|
}
|
|
nsock = i;
|
|
|
|
pfds = apr_pcalloc(p, (nsock+1) * sizeof(apr_pollfd_t*));
|
|
|
|
pt->type = PT_USER;
|
|
pt->baton = scb;
|
|
|
|
scb->cbfunc = cbfn;
|
|
scb->user_baton = baton;
|
|
scb->nsock = nsock;
|
|
scb->pfds = pfds;
|
|
|
|
for (i = 0; i<nsock; i++) {
|
|
pfds[i] = apr_pcalloc(p, sizeof(apr_pollfd_t));
|
|
pfds[i]->desc_type = APR_POLL_SOCKET;
|
|
pfds[i]->reqevents = (for_read ? APR_POLLIN : APR_POLLOUT) | APR_POLLERR | APR_POLLHUP;
|
|
pfds[i]->desc.s = s[i];
|
|
pfds[i]->p = p;
|
|
pfds[i]->client_data = pt;
|
|
}
|
|
|
|
if (timeout > 0) {
|
|
/* XXX: This cancel timer event count fire before the pollset is updated */
|
|
scb->cancel_event = event_get_timer_event(timeout + apr_time_now(), tofn, baton, 1, pfds);
|
|
}
|
|
for (i = 0; i<nsock; i++) {
|
|
rc = apr_pollset_add(event_pollset, pfds[i]);
|
|
if (rc != APR_SUCCESS) final_rc = rc;
|
|
}
|
|
return final_rc;
|
|
}
|
|
static apr_status_t event_register_socket_callback(apr_socket_t **s,
|
|
apr_pool_t *p,
|
|
int for_read,
|
|
ap_mpm_callback_fn_t *cbfn,
|
|
void *baton)
|
|
{
|
|
return event_register_socket_callback_ex(s, p, for_read,
|
|
cbfn,
|
|
NULL, /* no timeout function */
|
|
baton,
|
|
0 /* no timeout */);
|
|
}
|
|
static apr_status_t event_unregister_socket_callback(apr_socket_t **s, apr_pool_t *p)
|
|
{
|
|
int i = 0, nsock;
|
|
apr_status_t final_rc = APR_SUCCESS;
|
|
apr_pollfd_t **pfds = NULL;
|
|
|
|
while(s[i] != NULL) {
|
|
i++;
|
|
}
|
|
nsock = i;
|
|
|
|
pfds = apr_palloc(p, nsock * sizeof(apr_pollfd_t*));
|
|
|
|
for (i = 0; i<nsock; i++) {
|
|
apr_status_t rc;
|
|
pfds[i] = apr_pcalloc(p, sizeof(apr_pollfd_t));
|
|
pfds[i]->desc_type = APR_POLL_SOCKET;
|
|
pfds[i]->reqevents = APR_POLLERR | APR_POLLHUP;
|
|
pfds[i]->desc.s = s[i];
|
|
pfds[i]->client_data = NULL;
|
|
rc = apr_pollset_remove(event_pollset, pfds[i]);
|
|
if (rc != APR_SUCCESS && !APR_STATUS_IS_NOTFOUND(rc)) final_rc = APR_SUCCESS;
|
|
}
|
|
|
|
return final_rc;
|
|
}
|
|
|
|
/*
|
|
* Close socket and clean up if remote closed its end while we were in
|
|
* lingering close.
|
|
* Only to be called in the listener thread;
|
|
* Pre-condition: cs is in one of the linger queues and in the pollset
|
|
*/
|
|
static void process_lingering_close(event_conn_state_t *cs, const apr_pollfd_t *pfd)
|
|
{
|
|
apr_socket_t *csd = ap_get_conn_socket(cs->c);
|
|
char dummybuf[2048];
|
|
apr_size_t nbytes;
|
|
apr_status_t rv;
|
|
struct timeout_queue *q;
|
|
q = (cs->pub.state == CONN_STATE_LINGER_SHORT) ? &short_linger_q : &linger_q;
|
|
|
|
/* socket is already in non-blocking state */
|
|
do {
|
|
nbytes = sizeof(dummybuf);
|
|
rv = apr_socket_recv(csd, dummybuf, &nbytes);
|
|
} while (rv == APR_SUCCESS);
|
|
|
|
if (APR_STATUS_IS_EAGAIN(rv)) {
|
|
return;
|
|
}
|
|
|
|
apr_thread_mutex_lock(timeout_mutex);
|
|
rv = apr_pollset_remove(event_pollset, pfd);
|
|
AP_DEBUG_ASSERT(rv == APR_SUCCESS);
|
|
|
|
rv = apr_socket_close(csd);
|
|
AP_DEBUG_ASSERT(rv == APR_SUCCESS);
|
|
|
|
TO_QUEUE_REMOVE(*q, cs);
|
|
apr_thread_mutex_unlock(timeout_mutex);
|
|
TO_QUEUE_ELEM_INIT(cs);
|
|
|
|
ap_push_pool(worker_queue_info, cs->p);
|
|
}
|
|
|
|
/* call 'func' for all elements of 'q' with timeout less than 'timeout_time'.
|
|
* Pre-condition: timeout_mutex must already be locked
|
|
* Post-condition: timeout_mutex will be locked again
|
|
*/
|
|
static void process_timeout_queue(struct timeout_queue *q,
|
|
apr_time_t timeout_time,
|
|
int (*func)(event_conn_state_t *))
|
|
{
|
|
int count = 0;
|
|
event_conn_state_t *first, *cs, *last;
|
|
apr_status_t rv;
|
|
if (!q->count) {
|
|
return;
|
|
}
|
|
AP_DEBUG_ASSERT(!APR_RING_EMPTY(&q->head, event_conn_state_t, timeout_list));
|
|
|
|
cs = first = APR_RING_FIRST(&q->head);
|
|
while (cs != APR_RING_SENTINEL(&q->head, event_conn_state_t, timeout_list)
|
|
&& cs->expiration_time < timeout_time) {
|
|
last = cs;
|
|
rv = apr_pollset_remove(event_pollset, &cs->pfd);
|
|
if (rv != APR_SUCCESS && !APR_STATUS_IS_NOTFOUND(rv)) {
|
|
ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, cs->c, APLOGNO(00473)
|
|
"apr_pollset_remove failed");
|
|
}
|
|
cs = APR_RING_NEXT(cs, timeout_list);
|
|
count++;
|
|
}
|
|
if (!count)
|
|
return;
|
|
|
|
APR_RING_UNSPLICE(first, last, timeout_list);
|
|
AP_DEBUG_ASSERT(q->count >= count);
|
|
q->count -= count;
|
|
apr_thread_mutex_unlock(timeout_mutex);
|
|
while (count) {
|
|
cs = APR_RING_NEXT(first, timeout_list);
|
|
TO_QUEUE_ELEM_INIT(first);
|
|
func(first);
|
|
first = cs;
|
|
count--;
|
|
}
|
|
apr_thread_mutex_lock(timeout_mutex);
|
|
}
|
|
|
|
static void * APR_THREAD_FUNC listener_thread(apr_thread_t * thd, void *dummy)
|
|
{
|
|
apr_status_t rc;
|
|
proc_info *ti = dummy;
|
|
int process_slot = ti->pid;
|
|
apr_pool_t *tpool = apr_thread_pool_get(thd);
|
|
apr_time_t timeout_time = 0, last_log;
|
|
int closed = 0, listeners_disabled = 0;
|
|
int have_idle_worker = 0;
|
|
|
|
last_log = apr_time_now();
|
|
free(ti);
|
|
|
|
/* the following times out events that are really close in the future
|
|
* to prevent extra poll calls
|
|
*
|
|
* current value is .1 second
|
|
*/
|
|
#define TIMEOUT_FUDGE_FACTOR 100000
|
|
#define EVENT_FUDGE_FACTOR 10000
|
|
|
|
rc = init_pollset(tpool);
|
|
if (rc != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, rc, ap_server_conf,
|
|
"failed to initialize pollset, "
|
|
"attempting to shutdown process gracefully");
|
|
signal_threads(ST_GRACEFUL);
|
|
return NULL;
|
|
}
|
|
|
|
/* Unblock the signal used to wake this thread up, and set a handler for
|
|
* it.
|
|
*/
|
|
unblock_signal(LISTENER_SIGNAL);
|
|
apr_signal(LISTENER_SIGNAL, dummy_signal_handler);
|
|
|
|
for (;;) {
|
|
timer_event_t *te;
|
|
const apr_pollfd_t *out_pfd;
|
|
apr_int32_t num = 0;
|
|
apr_uint32_t c_count, l_count, i_count;
|
|
apr_interval_time_t timeout_interval;
|
|
apr_time_t now;
|
|
int workers_were_busy = 0;
|
|
if (listener_may_exit) {
|
|
close_listeners(process_slot, &closed);
|
|
if (terminate_mode == ST_UNGRACEFUL
|
|
|| apr_atomic_read32(&connection_count) == 0)
|
|
break;
|
|
}
|
|
|
|
if (conns_this_child <= 0)
|
|
check_infinite_requests();
|
|
|
|
if (APLOGtrace6(ap_server_conf)) {
|
|
now = apr_time_now();
|
|
/* trace log status every second */
|
|
if (now - last_log > apr_time_from_msec(1000)) {
|
|
last_log = now;
|
|
apr_thread_mutex_lock(timeout_mutex);
|
|
ap_log_error(APLOG_MARK, APLOG_TRACE6, 0, ap_server_conf,
|
|
"connections: %u (clogged: %u write-completion: %d "
|
|
"keep-alive: %d lingering: %d suspended: %u)",
|
|
apr_atomic_read32(&connection_count),
|
|
apr_atomic_read32(&clogged_count),
|
|
write_completion_q.count,
|
|
keepalive_q.count,
|
|
apr_atomic_read32(&lingering_count),
|
|
apr_atomic_read32(&suspended_count));
|
|
apr_thread_mutex_unlock(timeout_mutex);
|
|
}
|
|
}
|
|
|
|
#if HAVE_SERF
|
|
rc = serf_context_prerun(g_serf);
|
|
if (rc != APR_SUCCESS) {
|
|
/* TOOD: what should do here? ugh. */
|
|
}
|
|
#endif
|
|
|
|
now = apr_time_now();
|
|
apr_thread_mutex_lock(g_timer_skiplist_mtx);
|
|
te = apr_skiplist_peek(timer_skiplist);
|
|
if (te) {
|
|
if (te->when > now) {
|
|
timeout_interval = te->when - now;
|
|
}
|
|
else {
|
|
timeout_interval = 1;
|
|
}
|
|
}
|
|
else {
|
|
timeout_interval = apr_time_from_msec(100);
|
|
}
|
|
while (te) {
|
|
if (te->when < now + EVENT_FUDGE_FACTOR) {
|
|
apr_skiplist_pop(timer_skiplist, NULL);
|
|
if (!te->canceled) {
|
|
if (te->remove != NULL) {
|
|
apr_pollfd_t **pfds;
|
|
for (pfds = (te->remove); *pfds != NULL; pfds++) {
|
|
apr_pollset_remove(event_pollset, *pfds);
|
|
}
|
|
}
|
|
push_timer2worker(te);
|
|
}
|
|
else {
|
|
APR_RING_INSERT_TAIL(&timer_free_ring, te, timer_event_t,
|
|
link);
|
|
}
|
|
}
|
|
else {
|
|
break;
|
|
}
|
|
te = apr_skiplist_peek(timer_skiplist);
|
|
}
|
|
apr_thread_mutex_unlock(g_timer_skiplist_mtx);
|
|
|
|
rc = apr_pollset_poll(event_pollset, timeout_interval, &num, &out_pfd);
|
|
if (rc != APR_SUCCESS) {
|
|
if (APR_STATUS_IS_EINTR(rc)) {
|
|
continue;
|
|
}
|
|
if (!APR_STATUS_IS_TIMEUP(rc)) {
|
|
ap_log_error(APLOG_MARK, APLOG_CRIT, rc, ap_server_conf,
|
|
"apr_pollset_poll failed. Attempting to "
|
|
"shutdown process gracefully");
|
|
signal_threads(ST_GRACEFUL);
|
|
}
|
|
}
|
|
|
|
if (listener_may_exit) {
|
|
close_listeners(process_slot, &closed);
|
|
if (terminate_mode == ST_UNGRACEFUL
|
|
|| apr_atomic_read32(&connection_count) == 0)
|
|
break;
|
|
}
|
|
|
|
while (num) {
|
|
listener_poll_type *pt = (listener_poll_type *) out_pfd->client_data;
|
|
if (pt->type == PT_CSD) {
|
|
/* one of the sockets is readable */
|
|
struct timeout_queue *remove_from_q = &write_completion_q;
|
|
int blocking = 1;
|
|
event_conn_state_t *cs = (event_conn_state_t *) pt->baton;
|
|
switch (cs->pub.state) {
|
|
case CONN_STATE_CHECK_REQUEST_LINE_READABLE:
|
|
cs->pub.state = CONN_STATE_READ_REQUEST_LINE;
|
|
remove_from_q = &keepalive_q;
|
|
/* don't wait for a worker for a keepalive request */
|
|
blocking = 0;
|
|
/* FALL THROUGH */
|
|
case CONN_STATE_WRITE_COMPLETION:
|
|
get_worker(&have_idle_worker, blocking,
|
|
&workers_were_busy);
|
|
apr_thread_mutex_lock(timeout_mutex);
|
|
TO_QUEUE_REMOVE(*remove_from_q, cs);
|
|
rc = apr_pollset_remove(event_pollset, &cs->pfd);
|
|
|
|
/*
|
|
* Some of the pollset backends, like KQueue or Epoll
|
|
* automagically remove the FD if the socket is closed,
|
|
* therefore, we can accept _SUCCESS or _NOTFOUND,
|
|
* and we still want to keep going
|
|
*/
|
|
if (rc != APR_SUCCESS && !APR_STATUS_IS_NOTFOUND(rc)) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, rc, ap_server_conf,
|
|
"pollset remove failed");
|
|
apr_thread_mutex_unlock(timeout_mutex);
|
|
start_lingering_close_nonblocking(cs);
|
|
break;
|
|
}
|
|
|
|
apr_thread_mutex_unlock(timeout_mutex);
|
|
TO_QUEUE_ELEM_INIT(cs);
|
|
/* If we didn't get a worker immediately for a keep-alive
|
|
* request, we close the connection, so that the client can
|
|
* re-connect to a different process.
|
|
*/
|
|
if (!have_idle_worker) {
|
|
start_lingering_close_nonblocking(cs);
|
|
break;
|
|
}
|
|
rc = push2worker(out_pfd, event_pollset);
|
|
if (rc != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_CRIT, rc,
|
|
ap_server_conf, "push2worker failed");
|
|
}
|
|
else {
|
|
have_idle_worker = 0;
|
|
}
|
|
break;
|
|
case CONN_STATE_LINGER_NORMAL:
|
|
case CONN_STATE_LINGER_SHORT:
|
|
process_lingering_close(cs, out_pfd);
|
|
break;
|
|
default:
|
|
ap_log_error(APLOG_MARK, APLOG_CRIT, rc,
|
|
ap_server_conf,
|
|
"event_loop: unexpected state %d",
|
|
cs->pub.state);
|
|
ap_assert(0);
|
|
}
|
|
}
|
|
else if (pt->type == PT_ACCEPT) {
|
|
/* A Listener Socket is ready for an accept() */
|
|
if (workers_were_busy) {
|
|
if (!listeners_disabled)
|
|
disable_listensocks(process_slot);
|
|
listeners_disabled = 1;
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
|
|
"All workers busy, not accepting new conns "
|
|
"in this process");
|
|
}
|
|
else if ((c_count = apr_atomic_read32(&connection_count))
|
|
> (l_count = apr_atomic_read32(&lingering_count))
|
|
&& (c_count - l_count
|
|
> ap_queue_info_get_idlers(worker_queue_info)
|
|
* worker_factor / WORKER_FACTOR_SCALE
|
|
+ threads_per_child))
|
|
{
|
|
if (!listeners_disabled)
|
|
disable_listensocks(process_slot);
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
|
|
"Too many open connections (%u), "
|
|
"not accepting new conns in this process",
|
|
apr_atomic_read32(&connection_count));
|
|
ap_log_error(APLOG_MARK, APLOG_TRACE1, 0, ap_server_conf,
|
|
"Idle workers: %u",
|
|
ap_queue_info_get_idlers(worker_queue_info));
|
|
listeners_disabled = 1;
|
|
}
|
|
else if (listeners_disabled) {
|
|
listeners_disabled = 0;
|
|
enable_listensocks(process_slot);
|
|
}
|
|
if (!listeners_disabled) {
|
|
void *csd = NULL;
|
|
ap_listen_rec *lr = (ap_listen_rec *) pt->baton;
|
|
apr_pool_t *ptrans; /* Pool for per-transaction stuff */
|
|
ap_pop_pool(&ptrans, worker_queue_info);
|
|
|
|
if (ptrans == NULL) {
|
|
/* create a new transaction pool for each accepted socket */
|
|
apr_allocator_t *allocator;
|
|
|
|
apr_allocator_create(&allocator);
|
|
apr_allocator_max_free_set(allocator,
|
|
ap_max_mem_free);
|
|
apr_pool_create_ex(&ptrans, pconf, NULL, allocator);
|
|
apr_allocator_owner_set(allocator, ptrans);
|
|
if (ptrans == NULL) {
|
|
ap_log_error(APLOG_MARK, APLOG_CRIT, rc,
|
|
ap_server_conf,
|
|
"Failed to create transaction pool");
|
|
signal_threads(ST_GRACEFUL);
|
|
return NULL;
|
|
}
|
|
}
|
|
apr_pool_tag(ptrans, "transaction");
|
|
|
|
get_worker(&have_idle_worker, 1, &workers_were_busy);
|
|
rc = lr->accept_func(&csd, lr, ptrans);
|
|
|
|
/* later we trash rv and rely on csd to indicate
|
|
* success/failure
|
|
*/
|
|
AP_DEBUG_ASSERT(rc == APR_SUCCESS || !csd);
|
|
|
|
if (rc == APR_EGENERAL) {
|
|
/* E[NM]FILE, ENOMEM, etc */
|
|
resource_shortage = 1;
|
|
signal_threads(ST_GRACEFUL);
|
|
}
|
|
|
|
if (csd != NULL) {
|
|
conns_this_child--;
|
|
rc = ap_queue_push(worker_queue, csd, NULL, ptrans);
|
|
if (rc != APR_SUCCESS) {
|
|
/* trash the connection; we couldn't queue the connected
|
|
* socket to a worker
|
|
*/
|
|
apr_socket_close(csd);
|
|
ap_log_error(APLOG_MARK, APLOG_CRIT, rc,
|
|
ap_server_conf,
|
|
"ap_queue_push failed");
|
|
ap_push_pool(worker_queue_info, ptrans);
|
|
}
|
|
else {
|
|
have_idle_worker = 0;
|
|
}
|
|
}
|
|
else {
|
|
ap_push_pool(worker_queue_info, ptrans);
|
|
}
|
|
}
|
|
} /* if:else on pt->type */
|
|
#if HAVE_SERF
|
|
else if (pt->type == PT_SERF) {
|
|
/* send socket to serf. */
|
|
/* XXXX: this doesn't require get_worker() */
|
|
serf_event_trigger(g_serf, pt->baton, out_pfd);
|
|
}
|
|
|
|
#endif
|
|
else if (pt->type == PT_USER) {
|
|
/* masquerade as a timer event that is firing */
|
|
int i = 0;
|
|
socket_callback_baton_t *baton = (socket_callback_baton_t *) pt->baton;
|
|
if (baton->cancel_event) {
|
|
baton->cancel_event->canceled = 1;
|
|
}
|
|
|
|
/* We only signal once per N sockets with this baton */
|
|
if (!(baton->signaled)) {
|
|
baton->signaled = 1;
|
|
te = event_get_timer_event(-1 /* fake timer */,
|
|
baton->cbfunc,
|
|
baton->user_baton,
|
|
0, /* don't insert it */
|
|
NULL /* no associated socket callback */);
|
|
/* remove all sockets in my set */
|
|
for (i = 0; i < baton->nsock; i++) {
|
|
apr_pollset_remove(event_pollset, baton->pfds[i]);
|
|
}
|
|
|
|
push_timer2worker(te);
|
|
}
|
|
}
|
|
out_pfd++;
|
|
num--;
|
|
} /* while for processing poll */
|
|
|
|
/* XXX possible optimization: stash the current time for use as
|
|
* r->request_time for new requests
|
|
*/
|
|
now = apr_time_now();
|
|
/* we only do this once per 0.1s (TIMEOUT_FUDGE_FACTOR) */
|
|
if (now > timeout_time) {
|
|
struct process_score *ps;
|
|
timeout_time = now + TIMEOUT_FUDGE_FACTOR;
|
|
|
|
/* handle timed out sockets */
|
|
apr_thread_mutex_lock(timeout_mutex);
|
|
|
|
/* Step 1: keepalive timeouts */
|
|
/* If all workers are busy, we kill older keep-alive connections so that they
|
|
* may connect to another process.
|
|
*/
|
|
if (workers_were_busy && keepalive_q.count) {
|
|
ap_log_error(APLOG_MARK, APLOG_TRACE1, 0, ap_server_conf,
|
|
"All workers are busy, will close %d keep-alive "
|
|
"connections",
|
|
keepalive_q.count);
|
|
process_timeout_queue(&keepalive_q,
|
|
timeout_time + ap_server_conf->keep_alive_timeout,
|
|
start_lingering_close_nonblocking);
|
|
}
|
|
else {
|
|
process_timeout_queue(&keepalive_q, timeout_time,
|
|
start_lingering_close_nonblocking);
|
|
}
|
|
/* Step 2: write completion timeouts */
|
|
process_timeout_queue(&write_completion_q, timeout_time,
|
|
start_lingering_close_nonblocking);
|
|
/* Step 3: (normal) lingering close completion timeouts */
|
|
process_timeout_queue(&linger_q, timeout_time, stop_lingering_close);
|
|
/* Step 4: (short) lingering close completion timeouts */
|
|
process_timeout_queue(&short_linger_q, timeout_time, stop_lingering_close);
|
|
|
|
ps = ap_get_scoreboard_process(process_slot);
|
|
ps->write_completion = write_completion_q.count;
|
|
ps->keep_alive = keepalive_q.count;
|
|
apr_thread_mutex_unlock(timeout_mutex);
|
|
|
|
ps->connections = apr_atomic_read32(&connection_count);
|
|
ps->suspended = apr_atomic_read32(&suspended_count);
|
|
ps->lingering_close = apr_atomic_read32(&lingering_count);
|
|
}
|
|
if (listeners_disabled && !workers_were_busy
|
|
&& ((c_count = apr_atomic_read32(&connection_count))
|
|
>= (l_count = apr_atomic_read32(&lingering_count))
|
|
&& (i_count = ap_queue_info_get_idlers(worker_queue_info)) > 0
|
|
&& (c_count - l_count
|
|
< (i_count - 1) * worker_factor / WORKER_FACTOR_SCALE
|
|
+ threads_per_child)))
|
|
{
|
|
listeners_disabled = 0;
|
|
enable_listensocks(process_slot);
|
|
}
|
|
/*
|
|
* XXX: do we need to set some timeout that re-enables the listensocks
|
|
* XXX: in case no other event occurs?
|
|
*/
|
|
} /* listener main loop */
|
|
|
|
close_listeners(process_slot, &closed);
|
|
ap_queue_term(worker_queue);
|
|
|
|
apr_thread_exit(thd, APR_SUCCESS);
|
|
return NULL;
|
|
}
|
|
|
|
/* XXX For ungraceful termination/restart, we definitely don't want to
|
|
* wait for active connections to finish but we may want to wait
|
|
* for idle workers to get out of the queue code and release mutexes,
|
|
* since those mutexes are cleaned up pretty soon and some systems
|
|
* may not react favorably (i.e., segfault) if operations are attempted
|
|
* on cleaned-up mutexes.
|
|
*/
|
|
static void *APR_THREAD_FUNC worker_thread(apr_thread_t * thd, void *dummy)
|
|
{
|
|
proc_info *ti = dummy;
|
|
int process_slot = ti->pid;
|
|
int thread_slot = ti->tid;
|
|
apr_status_t rv;
|
|
int is_idle = 0;
|
|
|
|
free(ti);
|
|
|
|
ap_scoreboard_image->servers[process_slot][thread_slot].pid = ap_my_pid;
|
|
ap_scoreboard_image->servers[process_slot][thread_slot].tid = apr_os_thread_current();
|
|
ap_scoreboard_image->servers[process_slot][thread_slot].generation = retained->my_generation;
|
|
ap_update_child_status_from_indexes(process_slot, thread_slot,
|
|
SERVER_STARTING, NULL);
|
|
|
|
while (!workers_may_exit) {
|
|
apr_socket_t *csd = NULL;
|
|
event_conn_state_t *cs;
|
|
timer_event_t *te = NULL;
|
|
apr_pool_t *ptrans; /* Pool for per-transaction stuff */
|
|
|
|
if (!is_idle) {
|
|
rv = ap_queue_info_set_idle(worker_queue_info, NULL);
|
|
if (rv != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
|
|
"ap_queue_info_set_idle failed. Attempting to "
|
|
"shutdown process gracefully.");
|
|
signal_threads(ST_GRACEFUL);
|
|
break;
|
|
}
|
|
is_idle = 1;
|
|
}
|
|
|
|
ap_update_child_status_from_indexes(process_slot, thread_slot,
|
|
dying ? SERVER_GRACEFUL : SERVER_READY, NULL);
|
|
worker_pop:
|
|
if (workers_may_exit) {
|
|
break;
|
|
}
|
|
|
|
rv = ap_queue_pop_something(worker_queue, &csd, &cs, &ptrans, &te);
|
|
|
|
if (rv != APR_SUCCESS) {
|
|
/* We get APR_EOF during a graceful shutdown once all the
|
|
* connections accepted by this server process have been handled.
|
|
*/
|
|
if (APR_STATUS_IS_EOF(rv)) {
|
|
break;
|
|
}
|
|
/* We get APR_EINTR whenever ap_queue_pop() has been interrupted
|
|
* from an explicit call to ap_queue_interrupt_all(). This allows
|
|
* us to unblock threads stuck in ap_queue_pop() when a shutdown
|
|
* is pending.
|
|
*
|
|
* If workers_may_exit is set and this is ungraceful termination/
|
|
* restart, we are bound to get an error on some systems (e.g.,
|
|
* AIX, which sanity-checks mutex operations) since the queue
|
|
* may have already been cleaned up. Don't log the "error" if
|
|
* workers_may_exit is set.
|
|
*/
|
|
else if (APR_STATUS_IS_EINTR(rv)) {
|
|
goto worker_pop;
|
|
}
|
|
/* We got some other error. */
|
|
else if (!workers_may_exit) {
|
|
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf,
|
|
"ap_queue_pop failed");
|
|
}
|
|
continue;
|
|
}
|
|
if (te != NULL) {
|
|
te->cbfunc(te->baton);
|
|
{
|
|
apr_thread_mutex_lock(g_timer_skiplist_mtx);
|
|
APR_RING_INSERT_TAIL(&timer_free_ring, te, timer_event_t, link);
|
|
apr_thread_mutex_unlock(g_timer_skiplist_mtx);
|
|
}
|
|
}
|
|
else {
|
|
is_idle = 0;
|
|
worker_sockets[thread_slot] = csd;
|
|
process_socket(thd, ptrans, csd, cs, process_slot, thread_slot);
|
|
worker_sockets[thread_slot] = NULL;
|
|
}
|
|
}
|
|
|
|
ap_update_child_status_from_indexes(process_slot, thread_slot,
|
|
dying ? SERVER_DEAD :
|
|
SERVER_GRACEFUL,
|
|
(request_rec *) NULL);
|
|
|
|
apr_thread_exit(thd, APR_SUCCESS);
|
|
return NULL;
|
|
}
|
|
|
|
static int check_signal(int signum)
|
|
{
|
|
switch (signum) {
|
|
case SIGTERM:
|
|
case SIGINT:
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
static void create_listener_thread(thread_starter * ts)
|
|
{
|
|
int my_child_num = ts->child_num_arg;
|
|
apr_threadattr_t *thread_attr = ts->threadattr;
|
|
proc_info *my_info;
|
|
apr_status_t rv;
|
|
|
|
my_info = (proc_info *) ap_malloc(sizeof(proc_info));
|
|
my_info->pid = my_child_num;
|
|
my_info->tid = -1; /* listener thread doesn't have a thread slot */
|
|
my_info->sd = 0;
|
|
rv = apr_thread_create(&ts->listener, thread_attr, listener_thread,
|
|
my_info, pchild);
|
|
if (rv != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf, APLOGNO(00474)
|
|
"apr_thread_create: unable to create listener thread");
|
|
/* let the parent decide how bad this really is */
|
|
clean_child_exit(APEXIT_CHILDSICK);
|
|
}
|
|
apr_os_thread_get(&listener_os_thread, ts->listener);
|
|
}
|
|
|
|
/* XXX under some circumstances not understood, children can get stuck
|
|
* in start_threads forever trying to take over slots which will
|
|
* never be cleaned up; for now there is an APLOG_DEBUG message issued
|
|
* every so often when this condition occurs
|
|
*/
|
|
static void *APR_THREAD_FUNC start_threads(apr_thread_t * thd, void *dummy)
|
|
{
|
|
thread_starter *ts = dummy;
|
|
apr_thread_t **threads = ts->threads;
|
|
apr_threadattr_t *thread_attr = ts->threadattr;
|
|
int child_num_arg = ts->child_num_arg;
|
|
int my_child_num = child_num_arg;
|
|
proc_info *my_info;
|
|
apr_status_t rv;
|
|
int i;
|
|
int threads_created = 0;
|
|
int listener_started = 0;
|
|
int loops;
|
|
int prev_threads_created;
|
|
int max_recycled_pools = -1;
|
|
int good_methods[] = {APR_POLLSET_KQUEUE, APR_POLLSET_PORT, APR_POLLSET_EPOLL};
|
|
|
|
/* We must create the fd queues before we start up the listener
|
|
* and worker threads. */
|
|
worker_queue = apr_pcalloc(pchild, sizeof(*worker_queue));
|
|
rv = ap_queue_init(worker_queue, threads_per_child, pchild);
|
|
if (rv != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,
|
|
"ap_queue_init() failed");
|
|
clean_child_exit(APEXIT_CHILDFATAL);
|
|
}
|
|
|
|
if (ap_max_mem_free != APR_ALLOCATOR_MAX_FREE_UNLIMITED) {
|
|
/* If we want to conserve memory, let's not keep an unlimited number of
|
|
* pools & allocators.
|
|
* XXX: This should probably be a separate config directive
|
|
*/
|
|
max_recycled_pools = threads_per_child * 3 / 4 ;
|
|
}
|
|
rv = ap_queue_info_create(&worker_queue_info, pchild,
|
|
threads_per_child, max_recycled_pools);
|
|
if (rv != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,
|
|
"ap_queue_info_create() failed");
|
|
clean_child_exit(APEXIT_CHILDFATAL);
|
|
}
|
|
|
|
/* Create the timeout mutex and main pollset before the listener
|
|
* thread starts.
|
|
*/
|
|
rv = apr_thread_mutex_create(&timeout_mutex, APR_THREAD_MUTEX_DEFAULT,
|
|
pchild);
|
|
if (rv != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf,
|
|
"creation of the timeout mutex failed.");
|
|
clean_child_exit(APEXIT_CHILDFATAL);
|
|
}
|
|
|
|
/* Create the main pollset */
|
|
for (i = 0; i < sizeof(good_methods) / sizeof(void*); i++) {
|
|
rv = apr_pollset_create_ex(&event_pollset,
|
|
threads_per_child*2, /* XXX don't we need more, to handle
|
|
* connections in K-A or lingering
|
|
* close?
|
|
*/
|
|
pchild, APR_POLLSET_THREADSAFE | APR_POLLSET_NOCOPY | APR_POLLSET_NODEFAULT,
|
|
good_methods[i]);
|
|
if (rv == APR_SUCCESS) {
|
|
break;
|
|
}
|
|
}
|
|
if (rv != APR_SUCCESS) {
|
|
rv = apr_pollset_create(&event_pollset,
|
|
threads_per_child*2, /* XXX don't we need more, to handle
|
|
* connections in K-A or lingering
|
|
* close?
|
|
*/
|
|
pchild, APR_POLLSET_THREADSAFE | APR_POLLSET_NOCOPY);
|
|
}
|
|
if (rv != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf,
|
|
"apr_pollset_create with Thread Safety failed.");
|
|
clean_child_exit(APEXIT_CHILDFATAL);
|
|
}
|
|
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(02471)
|
|
"start_threads: Using %s", apr_pollset_method_name(event_pollset));
|
|
worker_sockets = apr_pcalloc(pchild, threads_per_child
|
|
* sizeof(apr_socket_t *));
|
|
|
|
loops = prev_threads_created = 0;
|
|
while (1) {
|
|
/* threads_per_child does not include the listener thread */
|
|
for (i = 0; i < threads_per_child; i++) {
|
|
int status =
|
|
ap_scoreboard_image->servers[child_num_arg][i].status;
|
|
|
|
if (status != SERVER_GRACEFUL && status != SERVER_DEAD) {
|
|
continue;
|
|
}
|
|
|
|
my_info = (proc_info *) ap_malloc(sizeof(proc_info));
|
|
my_info->pid = my_child_num;
|
|
my_info->tid = i;
|
|
my_info->sd = 0;
|
|
|
|
/* We are creating threads right now */
|
|
ap_update_child_status_from_indexes(my_child_num, i,
|
|
SERVER_STARTING, NULL);
|
|
/* We let each thread update its own scoreboard entry. This is
|
|
* done because it lets us deal with tid better.
|
|
*/
|
|
rv = apr_thread_create(&threads[i], thread_attr,
|
|
worker_thread, my_info, pchild);
|
|
if (rv != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,
|
|
"apr_thread_create: unable to create worker thread");
|
|
/* let the parent decide how bad this really is */
|
|
clean_child_exit(APEXIT_CHILDSICK);
|
|
}
|
|
threads_created++;
|
|
}
|
|
|
|
/* Start the listener only when there are workers available */
|
|
if (!listener_started && threads_created) {
|
|
create_listener_thread(ts);
|
|
listener_started = 1;
|
|
}
|
|
|
|
|
|
if (start_thread_may_exit || threads_created == threads_per_child) {
|
|
break;
|
|
}
|
|
/* wait for previous generation to clean up an entry */
|
|
apr_sleep(apr_time_from_sec(1));
|
|
++loops;
|
|
if (loops % 120 == 0) { /* every couple of minutes */
|
|
if (prev_threads_created == threads_created) {
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
|
|
"child %" APR_PID_T_FMT " isn't taking over "
|
|
"slots very quickly (%d of %d)",
|
|
ap_my_pid, threads_created,
|
|
threads_per_child);
|
|
}
|
|
prev_threads_created = threads_created;
|
|
}
|
|
}
|
|
|
|
/* What state should this child_main process be listed as in the
|
|
* scoreboard...?
|
|
* ap_update_child_status_from_indexes(my_child_num, i, SERVER_STARTING,
|
|
* (request_rec *) NULL);
|
|
*
|
|
* This state should be listed separately in the scoreboard, in some kind
|
|
* of process_status, not mixed in with the worker threads' status.
|
|
* "life_status" is almost right, but it's in the worker's structure, and
|
|
* the name could be clearer. gla
|
|
*/
|
|
apr_thread_exit(thd, APR_SUCCESS);
|
|
return NULL;
|
|
}
|
|
|
|
static void join_workers(apr_thread_t * listener, apr_thread_t ** threads)
|
|
{
|
|
int i;
|
|
apr_status_t rv, thread_rv;
|
|
|
|
if (listener) {
|
|
int iter;
|
|
|
|
/* deal with a rare timing window which affects waking up the
|
|
* listener thread... if the signal sent to the listener thread
|
|
* is delivered between the time it verifies that the
|
|
* listener_may_exit flag is clear and the time it enters a
|
|
* blocking syscall, the signal didn't do any good... work around
|
|
* that by sleeping briefly and sending it again
|
|
*/
|
|
|
|
iter = 0;
|
|
while (iter < 10 && !dying) {
|
|
/* listener has not stopped accepting yet */
|
|
apr_sleep(apr_time_make(0, 500000));
|
|
wakeup_listener();
|
|
++iter;
|
|
}
|
|
if (iter >= 10) {
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00475)
|
|
"the listener thread didn't stop accepting");
|
|
}
|
|
else {
|
|
rv = apr_thread_join(&thread_rv, listener);
|
|
if (rv != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00476)
|
|
"apr_thread_join: unable to join listener thread");
|
|
}
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < threads_per_child; i++) {
|
|
if (threads[i]) { /* if we ever created this thread */
|
|
rv = apr_thread_join(&thread_rv, threads[i]);
|
|
if (rv != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00477)
|
|
"apr_thread_join: unable to join worker "
|
|
"thread %d", i);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void join_start_thread(apr_thread_t * start_thread_id)
|
|
{
|
|
apr_status_t rv, thread_rv;
|
|
|
|
start_thread_may_exit = 1; /* tell it to give up in case it is still
|
|
* trying to take over slots from a
|
|
* previous generation
|
|
*/
|
|
rv = apr_thread_join(&thread_rv, start_thread_id);
|
|
if (rv != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00478)
|
|
"apr_thread_join: unable to join the start " "thread");
|
|
}
|
|
}
|
|
|
|
static void child_main(int child_num_arg, int child_bucket)
|
|
{
|
|
apr_thread_t **threads;
|
|
apr_status_t rv;
|
|
thread_starter *ts;
|
|
apr_threadattr_t *thread_attr;
|
|
apr_thread_t *start_thread_id;
|
|
apr_pool_t *pskip;
|
|
int i;
|
|
|
|
mpm_state = AP_MPMQ_STARTING; /* for benefit of any hooks that run as this
|
|
* child initializes
|
|
*/
|
|
ap_my_pid = getpid();
|
|
ap_fatal_signal_child_setup(ap_server_conf);
|
|
apr_pool_create(&pchild, pconf);
|
|
|
|
/* close unused listeners and pods */
|
|
for (i = 0; i < retained->num_buckets; i++) {
|
|
if (i != child_bucket) {
|
|
ap_close_listeners_ex(all_buckets[i].listeners);
|
|
ap_mpm_podx_close(all_buckets[i].pod);
|
|
}
|
|
}
|
|
|
|
/*stuff to do before we switch id's, so we have permissions. */
|
|
ap_reopen_scoreboard(pchild, NULL, 0);
|
|
|
|
if (ap_run_drop_privileges(pchild, ap_server_conf)) {
|
|
clean_child_exit(APEXIT_CHILDFATAL);
|
|
}
|
|
|
|
apr_thread_mutex_create(&g_timer_skiplist_mtx, APR_THREAD_MUTEX_DEFAULT, pchild);
|
|
APR_RING_INIT(&timer_free_ring, timer_event_t, link);
|
|
apr_pool_create(&pskip, pchild);
|
|
apr_skiplist_init(&timer_skiplist, pskip);
|
|
apr_skiplist_set_compare(timer_skiplist, indexing_comp, indexing_compk);
|
|
ap_run_child_init(pchild, ap_server_conf);
|
|
|
|
/* done with init critical section */
|
|
|
|
/* Just use the standard apr_setup_signal_thread to block all signals
|
|
* from being received. The child processes no longer use signals for
|
|
* any communication with the parent process.
|
|
*/
|
|
rv = apr_setup_signal_thread();
|
|
if (rv != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, APLOGNO(00479)
|
|
"Couldn't initialize signal thread");
|
|
clean_child_exit(APEXIT_CHILDFATAL);
|
|
}
|
|
|
|
if (ap_max_requests_per_child) {
|
|
conns_this_child = ap_max_requests_per_child;
|
|
}
|
|
else {
|
|
/* coding a value of zero means infinity */
|
|
conns_this_child = APR_INT32_MAX;
|
|
}
|
|
|
|
/* Setup worker threads */
|
|
|
|
/* clear the storage; we may not create all our threads immediately,
|
|
* and we want a 0 entry to indicate a thread which was not created
|
|
*/
|
|
threads = ap_calloc(threads_per_child, sizeof(apr_thread_t *));
|
|
ts = apr_palloc(pchild, sizeof(*ts));
|
|
|
|
apr_threadattr_create(&thread_attr, pchild);
|
|
/* 0 means PTHREAD_CREATE_JOINABLE */
|
|
apr_threadattr_detach_set(thread_attr, 0);
|
|
|
|
if (ap_thread_stacksize != 0) {
|
|
rv = apr_threadattr_stacksize_set(thread_attr, ap_thread_stacksize);
|
|
if (rv != APR_SUCCESS && rv != APR_ENOTIMPL) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf, APLOGNO(02436)
|
|
"WARNING: ThreadStackSize of %" APR_SIZE_T_FMT " is "
|
|
"inappropriate, using default",
|
|
ap_thread_stacksize);
|
|
}
|
|
}
|
|
|
|
ts->threads = threads;
|
|
ts->listener = NULL;
|
|
ts->child_num_arg = child_num_arg;
|
|
ts->threadattr = thread_attr;
|
|
|
|
rv = apr_thread_create(&start_thread_id, thread_attr, start_threads,
|
|
ts, pchild);
|
|
if (rv != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf, APLOGNO(00480)
|
|
"apr_thread_create: unable to create worker thread");
|
|
/* let the parent decide how bad this really is */
|
|
clean_child_exit(APEXIT_CHILDSICK);
|
|
}
|
|
|
|
mpm_state = AP_MPMQ_RUNNING;
|
|
|
|
/* If we are only running in one_process mode, we will want to
|
|
* still handle signals. */
|
|
if (one_process) {
|
|
/* Block until we get a terminating signal. */
|
|
apr_signal_thread(check_signal);
|
|
/* make sure the start thread has finished; signal_threads()
|
|
* and join_workers() depend on that
|
|
*/
|
|
/* XXX join_start_thread() won't be awakened if one of our
|
|
* threads encounters a critical error and attempts to
|
|
* shutdown this child
|
|
*/
|
|
join_start_thread(start_thread_id);
|
|
|
|
/* helps us terminate a little more quickly than the dispatch of the
|
|
* signal thread; beats the Pipe of Death and the browsers
|
|
*/
|
|
signal_threads(ST_UNGRACEFUL);
|
|
|
|
/* A terminating signal was received. Now join each of the
|
|
* workers to clean them up.
|
|
* If the worker already exited, then the join frees
|
|
* their resources and returns.
|
|
* If the worker hasn't exited, then this blocks until
|
|
* they have (then cleans up).
|
|
*/
|
|
join_workers(ts->listener, threads);
|
|
}
|
|
else { /* !one_process */
|
|
/* remove SIGTERM from the set of blocked signals... if one of
|
|
* the other threads in the process needs to take us down
|
|
* (e.g., for MaxConnectionsPerChild) it will send us SIGTERM
|
|
*/
|
|
unblock_signal(SIGTERM);
|
|
apr_signal(SIGTERM, dummy_signal_handler);
|
|
/* Watch for any messages from the parent over the POD */
|
|
while (1) {
|
|
rv = ap_mpm_podx_check(my_bucket->pod);
|
|
if (rv == AP_MPM_PODX_NORESTART) {
|
|
/* see if termination was triggered while we slept */
|
|
switch (terminate_mode) {
|
|
case ST_GRACEFUL:
|
|
rv = AP_MPM_PODX_GRACEFUL;
|
|
break;
|
|
case ST_UNGRACEFUL:
|
|
rv = AP_MPM_PODX_RESTART;
|
|
break;
|
|
}
|
|
}
|
|
if (rv == AP_MPM_PODX_GRACEFUL || rv == AP_MPM_PODX_RESTART) {
|
|
/* make sure the start thread has finished;
|
|
* signal_threads() and join_workers depend on that
|
|
*/
|
|
join_start_thread(start_thread_id);
|
|
signal_threads(rv ==
|
|
AP_MPM_PODX_GRACEFUL ? ST_GRACEFUL : ST_UNGRACEFUL);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* A terminating signal was received. Now join each of the
|
|
* workers to clean them up.
|
|
* If the worker already exited, then the join frees
|
|
* their resources and returns.
|
|
* If the worker hasn't exited, then this blocks until
|
|
* they have (then cleans up).
|
|
*/
|
|
join_workers(ts->listener, threads);
|
|
}
|
|
|
|
free(threads);
|
|
|
|
clean_child_exit(resource_shortage ? APEXIT_CHILDSICK : 0);
|
|
}
|
|
|
|
static int make_child(server_rec * s, int slot, int bucket)
|
|
{
|
|
int pid;
|
|
|
|
if (slot + 1 > retained->max_daemons_limit) {
|
|
retained->max_daemons_limit = slot + 1;
|
|
}
|
|
|
|
if (one_process) {
|
|
my_bucket = &all_buckets[0];
|
|
|
|
set_signals();
|
|
event_note_child_started(slot, getpid());
|
|
child_main(slot, 0);
|
|
/* NOTREACHED */
|
|
ap_assert(0);
|
|
return -1;
|
|
}
|
|
|
|
if ((pid = fork()) == -1) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, errno, s, APLOGNO(00481)
|
|
"fork: Unable to fork new process");
|
|
|
|
/* fork didn't succeed. There's no need to touch the scoreboard;
|
|
* if we were trying to replace a failed child process, then
|
|
* server_main_loop() marked its workers SERVER_DEAD, and if
|
|
* we were trying to replace a child process that exited normally,
|
|
* its worker_thread()s left SERVER_DEAD or SERVER_GRACEFUL behind.
|
|
*/
|
|
|
|
/* In case system resources are maxxed out, we don't want
|
|
Apache running away with the CPU trying to fork over and
|
|
over and over again. */
|
|
apr_sleep(apr_time_from_sec(10));
|
|
|
|
return -1;
|
|
}
|
|
|
|
if (!pid) {
|
|
my_bucket = &all_buckets[bucket];
|
|
|
|
#ifdef HAVE_BINDPROCESSOR
|
|
/* By default, AIX binds to a single processor. This bit unbinds
|
|
* children which will then bind to another CPU.
|
|
*/
|
|
int status = bindprocessor(BINDPROCESS, (int) getpid(),
|
|
PROCESSOR_CLASS_ANY);
|
|
if (status != OK)
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, errno,
|
|
ap_server_conf, APLOGNO(00482)
|
|
"processor unbind failed");
|
|
#endif
|
|
RAISE_SIGSTOP(MAKE_CHILD);
|
|
|
|
apr_signal(SIGTERM, just_die);
|
|
child_main(slot, bucket);
|
|
/* NOTREACHED */
|
|
ap_assert(0);
|
|
return -1;
|
|
}
|
|
|
|
if (ap_scoreboard_image->parent[slot].pid != 0) {
|
|
/* This new child process is squatting on the scoreboard
|
|
* entry owned by an exiting child process, which cannot
|
|
* exit until all active requests complete.
|
|
*/
|
|
event_note_child_lost_slot(slot, pid);
|
|
}
|
|
ap_scoreboard_image->parent[slot].quiescing = 0;
|
|
ap_scoreboard_image->parent[slot].not_accepting = 0;
|
|
ap_scoreboard_image->parent[slot].bucket = bucket;
|
|
event_note_child_started(slot, pid);
|
|
return 0;
|
|
}
|
|
|
|
/* start up a bunch of children */
|
|
static void startup_children(int number_to_start)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; number_to_start && i < ap_daemons_limit; ++i) {
|
|
if (ap_scoreboard_image->parent[i].pid != 0) {
|
|
continue;
|
|
}
|
|
if (make_child(ap_server_conf, i, i % retained->num_buckets) < 0) {
|
|
break;
|
|
}
|
|
--number_to_start;
|
|
}
|
|
}
|
|
|
|
static void perform_idle_server_maintenance(int child_bucket, int num_buckets)
|
|
{
|
|
int i, j;
|
|
int idle_thread_count;
|
|
worker_score *ws;
|
|
process_score *ps;
|
|
int free_length;
|
|
int totally_free_length = 0;
|
|
int free_slots[MAX_SPAWN_RATE];
|
|
int last_non_dead;
|
|
int total_non_dead;
|
|
int active_thread_count = 0;
|
|
|
|
/* initialize the free_list */
|
|
free_length = 0;
|
|
|
|
idle_thread_count = 0;
|
|
last_non_dead = -1;
|
|
total_non_dead = 0;
|
|
|
|
for (i = 0; i < ap_daemons_limit; ++i) {
|
|
/* Initialization to satisfy the compiler. It doesn't know
|
|
* that threads_per_child is always > 0 */
|
|
int status = SERVER_DEAD;
|
|
int any_dying_threads = 0;
|
|
int any_dead_threads = 0;
|
|
int all_dead_threads = 1;
|
|
int child_threads_active = 0;
|
|
|
|
if (i >= retained->max_daemons_limit
|
|
&& totally_free_length == retained->idle_spawn_rate[child_bucket])
|
|
/* short cut if all active processes have been examined and
|
|
* enough empty scoreboard slots have been found
|
|
*/
|
|
|
|
break;
|
|
ps = &ap_scoreboard_image->parent[i];
|
|
for (j = 0; j < threads_per_child; j++) {
|
|
ws = &ap_scoreboard_image->servers[i][j];
|
|
status = ws->status;
|
|
|
|
/* XXX any_dying_threads is probably no longer needed GLA */
|
|
any_dying_threads = any_dying_threads ||
|
|
(status == SERVER_GRACEFUL);
|
|
any_dead_threads = any_dead_threads || (status == SERVER_DEAD);
|
|
all_dead_threads = all_dead_threads &&
|
|
(status == SERVER_DEAD || status == SERVER_GRACEFUL);
|
|
|
|
/* We consider a starting server as idle because we started it
|
|
* at least a cycle ago, and if it still hasn't finished starting
|
|
* then we're just going to swamp things worse by forking more.
|
|
* So we hopefully won't need to fork more if we count it.
|
|
* This depends on the ordering of SERVER_READY and SERVER_STARTING.
|
|
*/
|
|
if (ps->pid != 0) { /* XXX just set all_dead_threads in outer
|
|
for loop if no pid? not much else matters */
|
|
if (status <= SERVER_READY && !ps->quiescing && !ps->not_accepting
|
|
&& ps->generation == retained->my_generation
|
|
&& ps->bucket == child_bucket)
|
|
{
|
|
++idle_thread_count;
|
|
}
|
|
if (status >= SERVER_READY && status < SERVER_GRACEFUL) {
|
|
++child_threads_active;
|
|
}
|
|
}
|
|
}
|
|
active_thread_count += child_threads_active;
|
|
if (any_dead_threads
|
|
&& totally_free_length < retained->idle_spawn_rate[child_bucket]
|
|
&& free_length < MAX_SPAWN_RATE / num_buckets
|
|
&& (!ps->pid /* no process in the slot */
|
|
|| ps->quiescing)) { /* or at least one is going away */
|
|
if (all_dead_threads) {
|
|
/* great! we prefer these, because the new process can
|
|
* start more threads sooner. So prioritize this slot
|
|
* by putting it ahead of any slots with active threads.
|
|
*
|
|
* first, make room by moving a slot that's potentially still
|
|
* in use to the end of the array
|
|
*/
|
|
free_slots[free_length] = free_slots[totally_free_length];
|
|
free_slots[totally_free_length++] = i;
|
|
}
|
|
else {
|
|
/* slot is still in use - back of the bus
|
|
*/
|
|
free_slots[free_length] = i;
|
|
}
|
|
++free_length;
|
|
}
|
|
else if (child_threads_active == threads_per_child) {
|
|
had_healthy_child = 1;
|
|
}
|
|
/* XXX if (!ps->quiescing) is probably more reliable GLA */
|
|
if (!any_dying_threads) {
|
|
last_non_dead = i;
|
|
++total_non_dead;
|
|
}
|
|
}
|
|
|
|
if (retained->sick_child_detected) {
|
|
if (had_healthy_child) {
|
|
/* Assume this is a transient error, even though it may not be. Leave
|
|
* the server up in case it is able to serve some requests or the
|
|
* problem will be resolved.
|
|
*/
|
|
retained->sick_child_detected = 0;
|
|
}
|
|
else {
|
|
/* looks like a basket case, as no child ever fully initialized; give up.
|
|
*/
|
|
shutdown_pending = 1;
|
|
child_fatal = 1;
|
|
ap_log_error(APLOG_MARK, APLOG_ALERT, 0,
|
|
ap_server_conf, APLOGNO(02324)
|
|
"A resource shortage or other unrecoverable failure "
|
|
"was encountered before any child process initialized "
|
|
"successfully... httpd is exiting!");
|
|
/* the child already logged the failure details */
|
|
return;
|
|
}
|
|
}
|
|
|
|
retained->max_daemons_limit = last_non_dead + 1;
|
|
|
|
if (idle_thread_count > max_spare_threads / num_buckets) {
|
|
/* Kill off one child */
|
|
ap_mpm_podx_signal(all_buckets[child_bucket].pod,
|
|
AP_MPM_PODX_GRACEFUL);
|
|
retained->idle_spawn_rate[child_bucket] = 1;
|
|
}
|
|
else if (idle_thread_count < min_spare_threads / num_buckets) {
|
|
/* terminate the free list */
|
|
if (free_length == 0) { /* scoreboard is full, can't fork */
|
|
|
|
if (active_thread_count >= ap_daemons_limit * threads_per_child) {
|
|
if (!retained->maxclients_reported) {
|
|
/* only report this condition once */
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(00484)
|
|
"server reached MaxRequestWorkers setting, "
|
|
"consider raising the MaxRequestWorkers "
|
|
"setting");
|
|
retained->maxclients_reported = 1;
|
|
}
|
|
}
|
|
else {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(00485)
|
|
"scoreboard is full, not at MaxRequestWorkers");
|
|
}
|
|
retained->idle_spawn_rate[child_bucket] = 1;
|
|
}
|
|
else {
|
|
if (free_length > retained->idle_spawn_rate[child_bucket]) {
|
|
free_length = retained->idle_spawn_rate[child_bucket];
|
|
}
|
|
if (retained->idle_spawn_rate[child_bucket] >= 8) {
|
|
ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(00486)
|
|
"server seems busy, (you may need "
|
|
"to increase StartServers, ThreadsPerChild "
|
|
"or Min/MaxSpareThreads), "
|
|
"spawning %d children, there are around %d idle "
|
|
"threads, and %d total children", free_length,
|
|
idle_thread_count, total_non_dead);
|
|
}
|
|
for (i = 0; i < free_length; ++i) {
|
|
make_child(ap_server_conf, free_slots[i], child_bucket);
|
|
}
|
|
/* the next time around we want to spawn twice as many if this
|
|
* wasn't good enough, but not if we've just done a graceful
|
|
*/
|
|
if (retained->hold_off_on_exponential_spawning) {
|
|
--retained->hold_off_on_exponential_spawning;
|
|
}
|
|
else if (retained->idle_spawn_rate[child_bucket]
|
|
< MAX_SPAWN_RATE / num_buckets) {
|
|
retained->idle_spawn_rate[child_bucket] *= 2;
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
retained->idle_spawn_rate[child_bucket] = 1;
|
|
}
|
|
}
|
|
|
|
static void server_main_loop(int remaining_children_to_start, int num_buckets)
|
|
{
|
|
ap_generation_t old_gen;
|
|
int child_slot;
|
|
apr_exit_why_e exitwhy;
|
|
int status, processed_status;
|
|
apr_proc_t pid;
|
|
int i;
|
|
|
|
while (!restart_pending && !shutdown_pending) {
|
|
ap_wait_or_timeout(&exitwhy, &status, &pid, pconf, ap_server_conf);
|
|
|
|
if (pid.pid != -1) {
|
|
processed_status = ap_process_child_status(&pid, exitwhy, status);
|
|
child_slot = ap_find_child_by_pid(&pid);
|
|
if (processed_status == APEXIT_CHILDFATAL) {
|
|
/* fix race condition found in PR 39311
|
|
* A child created at the same time as a graceful happens
|
|
* can find the lock missing and create a fatal error.
|
|
* It is not fatal for the last generation to be in this state.
|
|
*/
|
|
if (child_slot < 0
|
|
|| ap_get_scoreboard_process(child_slot)->generation
|
|
== retained->my_generation) {
|
|
shutdown_pending = 1;
|
|
child_fatal = 1;
|
|
return;
|
|
}
|
|
else {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, ap_server_conf, APLOGNO(00487)
|
|
"Ignoring fatal error in child of previous "
|
|
"generation (pid %ld).",
|
|
(long)pid.pid);
|
|
retained->sick_child_detected = 1;
|
|
}
|
|
}
|
|
else if (processed_status == APEXIT_CHILDSICK) {
|
|
/* tell perform_idle_server_maintenance to check into this
|
|
* on the next timer pop
|
|
*/
|
|
retained->sick_child_detected = 1;
|
|
}
|
|
/* non-fatal death... note that it's gone in the scoreboard. */
|
|
if (child_slot >= 0) {
|
|
process_score *ps;
|
|
|
|
for (i = 0; i < threads_per_child; i++)
|
|
ap_update_child_status_from_indexes(child_slot, i,
|
|
SERVER_DEAD,
|
|
(request_rec *) NULL);
|
|
|
|
event_note_child_killed(child_slot, 0, 0);
|
|
ps = &ap_scoreboard_image->parent[child_slot];
|
|
ps->quiescing = 0;
|
|
if (processed_status == APEXIT_CHILDSICK) {
|
|
/* resource shortage, minimize the fork rate */
|
|
retained->idle_spawn_rate[ps->bucket] = 1;
|
|
}
|
|
else if (remaining_children_to_start
|
|
&& child_slot < ap_daemons_limit) {
|
|
/* we're still doing a 1-for-1 replacement of dead
|
|
* children with new children
|
|
*/
|
|
make_child(ap_server_conf, child_slot, ps->bucket);
|
|
--remaining_children_to_start;
|
|
}
|
|
}
|
|
else if (ap_unregister_extra_mpm_process(pid.pid, &old_gen) == 1) {
|
|
|
|
event_note_child_killed(-1, /* already out of the scoreboard */
|
|
pid.pid, old_gen);
|
|
if (processed_status == APEXIT_CHILDSICK
|
|
&& old_gen == retained->my_generation) {
|
|
/* resource shortage, minimize the fork rate */
|
|
for (i = 0; i < num_buckets; i++) {
|
|
retained->idle_spawn_rate[i] = 1;
|
|
}
|
|
}
|
|
#if APR_HAS_OTHER_CHILD
|
|
}
|
|
else if (apr_proc_other_child_alert(&pid, APR_OC_REASON_DEATH,
|
|
status) == 0) {
|
|
/* handled */
|
|
#endif
|
|
}
|
|
else if (retained->is_graceful) {
|
|
/* Great, we've probably just lost a slot in the
|
|
* scoreboard. Somehow we don't know about this child.
|
|
*/
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0,
|
|
ap_server_conf, APLOGNO(00488)
|
|
"long lost child came home! (pid %ld)",
|
|
(long) pid.pid);
|
|
}
|
|
/* Don't perform idle maintenance when a child dies,
|
|
* only do it when there's a timeout. Remember only a
|
|
* finite number of children can die, and it's pretty
|
|
* pathological for a lot to die suddenly.
|
|
*/
|
|
continue;
|
|
}
|
|
else if (remaining_children_to_start) {
|
|
/* we hit a 1 second timeout in which none of the previous
|
|
* generation of children needed to be reaped... so assume
|
|
* they're all done, and pick up the slack if any is left.
|
|
*/
|
|
startup_children(remaining_children_to_start);
|
|
remaining_children_to_start = 0;
|
|
/* In any event we really shouldn't do the code below because
|
|
* few of the servers we just started are in the IDLE state
|
|
* yet, so we'd mistakenly create an extra server.
|
|
*/
|
|
continue;
|
|
}
|
|
|
|
for (i = 0; i < num_buckets; i++) {
|
|
perform_idle_server_maintenance(i, num_buckets);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int event_run(apr_pool_t * _pconf, apr_pool_t * plog, server_rec * s)
|
|
{
|
|
int num_buckets = retained->num_buckets;
|
|
int remaining_children_to_start;
|
|
int i;
|
|
|
|
ap_log_pid(pconf, ap_pid_fname);
|
|
|
|
if (!retained->is_graceful) {
|
|
if (ap_run_pre_mpm(s->process->pool, SB_SHARED) != OK) {
|
|
mpm_state = AP_MPMQ_STOPPING;
|
|
return !OK;
|
|
}
|
|
/* fix the generation number in the global score; we just got a new,
|
|
* cleared scoreboard
|
|
*/
|
|
ap_scoreboard_image->global->running_generation = retained->my_generation;
|
|
}
|
|
|
|
restart_pending = shutdown_pending = 0;
|
|
set_signals();
|
|
|
|
/* Don't thrash since num_buckets depends on the
|
|
* system and the number of online CPU cores...
|
|
*/
|
|
if (ap_daemons_limit < num_buckets)
|
|
ap_daemons_limit = num_buckets;
|
|
if (ap_daemons_to_start < num_buckets)
|
|
ap_daemons_to_start = num_buckets;
|
|
if (min_spare_threads < threads_per_child * num_buckets)
|
|
min_spare_threads = threads_per_child * num_buckets;
|
|
if (max_spare_threads < min_spare_threads + threads_per_child * num_buckets)
|
|
max_spare_threads = min_spare_threads + threads_per_child * num_buckets;
|
|
|
|
/* If we're doing a graceful_restart then we're going to see a lot
|
|
* of children exiting immediately when we get into the main loop
|
|
* below (because we just sent them AP_SIG_GRACEFUL). This happens pretty
|
|
* rapidly... and for each one that exits we may start a new one, until
|
|
* there are at least min_spare_threads idle threads, counting across
|
|
* all children. But we may be permitted to start more children than
|
|
* that, so we'll just keep track of how many we're
|
|
* supposed to start up without the 1 second penalty between each fork.
|
|
*/
|
|
remaining_children_to_start = ap_daemons_to_start;
|
|
if (remaining_children_to_start > ap_daemons_limit) {
|
|
remaining_children_to_start = ap_daemons_limit;
|
|
}
|
|
if (!retained->is_graceful) {
|
|
startup_children(remaining_children_to_start);
|
|
remaining_children_to_start = 0;
|
|
}
|
|
else {
|
|
/* give the system some time to recover before kicking into
|
|
* exponential mode */
|
|
retained->hold_off_on_exponential_spawning = 10;
|
|
}
|
|
|
|
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00489)
|
|
"%s configured -- resuming normal operations",
|
|
ap_get_server_description());
|
|
ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(00490)
|
|
"Server built: %s", ap_get_server_built());
|
|
ap_log_command_line(plog, s);
|
|
ap_log_common(s);
|
|
|
|
mpm_state = AP_MPMQ_RUNNING;
|
|
|
|
server_main_loop(remaining_children_to_start, num_buckets);
|
|
mpm_state = AP_MPMQ_STOPPING;
|
|
|
|
if (shutdown_pending && !retained->is_graceful) {
|
|
/* Time to shut down:
|
|
* Kill child processes, tell them to call child_exit, etc...
|
|
*/
|
|
for (i = 0; i < num_buckets; i++) {
|
|
ap_mpm_podx_killpg(all_buckets[i].pod, ap_daemons_limit,
|
|
AP_MPM_PODX_RESTART);
|
|
}
|
|
ap_reclaim_child_processes(1, /* Start with SIGTERM */
|
|
event_note_child_killed);
|
|
|
|
if (!child_fatal) {
|
|
/* cleanup pid file on normal shutdown */
|
|
ap_remove_pid(pconf, ap_pid_fname);
|
|
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0,
|
|
ap_server_conf, APLOGNO(00491) "caught SIGTERM, shutting down");
|
|
}
|
|
return DONE;
|
|
} else if (shutdown_pending) {
|
|
/* Time to gracefully shut down:
|
|
* Kill child processes, tell them to call child_exit, etc...
|
|
*/
|
|
int active_children;
|
|
int index;
|
|
apr_time_t cutoff = 0;
|
|
|
|
/* Close our listeners, and then ask our children to do same */
|
|
ap_close_listeners();
|
|
for (i = 0; i < num_buckets; i++) {
|
|
ap_mpm_podx_killpg(all_buckets[i].pod, ap_daemons_limit,
|
|
AP_MPM_PODX_GRACEFUL);
|
|
}
|
|
ap_relieve_child_processes(event_note_child_killed);
|
|
|
|
if (!child_fatal) {
|
|
/* cleanup pid file on normal shutdown */
|
|
ap_remove_pid(pconf, ap_pid_fname);
|
|
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00492)
|
|
"caught " AP_SIG_GRACEFUL_STOP_STRING
|
|
", shutting down gracefully");
|
|
}
|
|
|
|
if (ap_graceful_shutdown_timeout) {
|
|
cutoff = apr_time_now() +
|
|
apr_time_from_sec(ap_graceful_shutdown_timeout);
|
|
}
|
|
|
|
/* Don't really exit until each child has finished */
|
|
shutdown_pending = 0;
|
|
do {
|
|
/* Pause for a second */
|
|
apr_sleep(apr_time_from_sec(1));
|
|
|
|
/* Relieve any children which have now exited */
|
|
ap_relieve_child_processes(event_note_child_killed);
|
|
|
|
active_children = 0;
|
|
for (index = 0; index < ap_daemons_limit; ++index) {
|
|
if (ap_mpm_safe_kill(MPM_CHILD_PID(index), 0) == APR_SUCCESS) {
|
|
active_children = 1;
|
|
/* Having just one child is enough to stay around */
|
|
break;
|
|
}
|
|
}
|
|
} while (!shutdown_pending && active_children &&
|
|
(!ap_graceful_shutdown_timeout || apr_time_now() < cutoff));
|
|
|
|
/* We might be here because we received SIGTERM, either
|
|
* way, try and make sure that all of our processes are
|
|
* really dead.
|
|
*/
|
|
for (i = 0; i < num_buckets; i++) {
|
|
ap_mpm_podx_killpg(all_buckets[i].pod, ap_daemons_limit,
|
|
AP_MPM_PODX_RESTART);
|
|
}
|
|
ap_reclaim_child_processes(1, event_note_child_killed);
|
|
|
|
return DONE;
|
|
}
|
|
|
|
/* we've been told to restart */
|
|
apr_signal(SIGHUP, SIG_IGN);
|
|
|
|
if (one_process) {
|
|
/* not worth thinking about */
|
|
return DONE;
|
|
}
|
|
|
|
/* advance to the next generation */
|
|
/* XXX: we really need to make sure this new generation number isn't in
|
|
* use by any of the children.
|
|
*/
|
|
++retained->my_generation;
|
|
ap_scoreboard_image->global->running_generation = retained->my_generation;
|
|
|
|
if (retained->is_graceful) {
|
|
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00493)
|
|
AP_SIG_GRACEFUL_STRING
|
|
" received. Doing graceful restart");
|
|
/* wake up the children...time to die. But we'll have more soon */
|
|
for (i = 0; i < num_buckets; i++) {
|
|
ap_mpm_podx_killpg(all_buckets[i].pod, ap_daemons_limit,
|
|
AP_MPM_PODX_GRACEFUL);
|
|
}
|
|
|
|
/* This is mostly for debugging... so that we know what is still
|
|
* gracefully dealing with existing request.
|
|
*/
|
|
|
|
}
|
|
else {
|
|
/* Kill 'em all. Since the child acts the same on the parents SIGTERM
|
|
* and a SIGHUP, we may as well use the same signal, because some user
|
|
* pthreads are stealing signals from us left and right.
|
|
*/
|
|
for (i = 0; i < num_buckets; i++) {
|
|
ap_mpm_podx_killpg(all_buckets[i].pod, ap_daemons_limit,
|
|
AP_MPM_PODX_RESTART);
|
|
}
|
|
|
|
ap_reclaim_child_processes(1, /* Start with SIGTERM */
|
|
event_note_child_killed);
|
|
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00494)
|
|
"SIGHUP received. Attempting to restart");
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
/* This really should be a post_config hook, but the error log is already
|
|
* redirected by that point, so we need to do this in the open_logs phase.
|
|
*/
|
|
static int event_open_logs(apr_pool_t * p, apr_pool_t * plog,
|
|
apr_pool_t * ptemp, server_rec * s)
|
|
{
|
|
int startup = 0;
|
|
int level_flags = 0;
|
|
int num_buckets = 0;
|
|
ap_listen_rec **listen_buckets;
|
|
apr_status_t rv;
|
|
int i;
|
|
|
|
pconf = p;
|
|
|
|
/* the reverse of pre_config, we want this only the first time around */
|
|
if (retained->module_loads == 1) {
|
|
startup = 1;
|
|
level_flags |= APLOG_STARTUP;
|
|
}
|
|
|
|
if ((num_listensocks = ap_setup_listeners(ap_server_conf)) < 1) {
|
|
ap_log_error(APLOG_MARK, APLOG_ALERT | level_flags, 0,
|
|
(startup ? NULL : s),
|
|
"no listening sockets available, shutting down");
|
|
return DONE;
|
|
}
|
|
|
|
if (one_process) {
|
|
num_buckets = 1;
|
|
}
|
|
else if (retained->is_graceful) {
|
|
/* Preserve the number of buckets on graceful restarts. */
|
|
num_buckets = retained->num_buckets;
|
|
}
|
|
if ((rv = ap_duplicate_listeners(pconf, ap_server_conf,
|
|
&listen_buckets, &num_buckets))) {
|
|
ap_log_error(APLOG_MARK, APLOG_CRIT | level_flags, rv,
|
|
(startup ? NULL : s),
|
|
"could not duplicate listeners");
|
|
return DONE;
|
|
}
|
|
|
|
all_buckets = apr_pcalloc(pconf, num_buckets * sizeof(*all_buckets));
|
|
for (i = 0; i < num_buckets; i++) {
|
|
if (!one_process && /* no POD in one_process mode */
|
|
(rv = ap_mpm_podx_open(pconf, &all_buckets[i].pod))) {
|
|
ap_log_error(APLOG_MARK, APLOG_CRIT | level_flags, rv,
|
|
(startup ? NULL : s),
|
|
"could not open pipe-of-death");
|
|
return DONE;
|
|
}
|
|
all_buckets[i].listeners = listen_buckets[i];
|
|
}
|
|
|
|
if (retained->max_buckets < num_buckets) {
|
|
int new_max, *new_ptr;
|
|
new_max = retained->max_buckets * 2;
|
|
if (new_max < num_buckets) {
|
|
new_max = num_buckets;
|
|
}
|
|
new_ptr = (int *)apr_palloc(ap_pglobal, new_max * sizeof(int));
|
|
memcpy(new_ptr, retained->idle_spawn_rate,
|
|
retained->num_buckets * sizeof(int));
|
|
retained->idle_spawn_rate = new_ptr;
|
|
retained->max_buckets = new_max;
|
|
}
|
|
if (retained->num_buckets < num_buckets) {
|
|
int rate_max = 1;
|
|
/* If new buckets are added, set their idle spawn rate to
|
|
* the highest so far, so that they get filled as quickly
|
|
* as the existing ones.
|
|
*/
|
|
for (i = 0; i < retained->num_buckets; i++) {
|
|
if (rate_max < retained->idle_spawn_rate[i]) {
|
|
rate_max = retained->idle_spawn_rate[i];
|
|
}
|
|
}
|
|
for (/* up to date i */; i < num_buckets; i++) {
|
|
retained->idle_spawn_rate[i] = rate_max;
|
|
}
|
|
}
|
|
retained->num_buckets = num_buckets;
|
|
|
|
/* for skiplist */
|
|
srand((unsigned int)apr_time_now());
|
|
return OK;
|
|
}
|
|
|
|
static int event_pre_config(apr_pool_t * pconf, apr_pool_t * plog,
|
|
apr_pool_t * ptemp)
|
|
{
|
|
int no_detach, debug, foreground;
|
|
apr_status_t rv;
|
|
const char *userdata_key = "mpm_event_module";
|
|
|
|
mpm_state = AP_MPMQ_STARTING;
|
|
|
|
debug = ap_exists_config_define("DEBUG");
|
|
|
|
if (debug) {
|
|
foreground = one_process = 1;
|
|
no_detach = 0;
|
|
}
|
|
else {
|
|
one_process = ap_exists_config_define("ONE_PROCESS");
|
|
no_detach = ap_exists_config_define("NO_DETACH");
|
|
foreground = ap_exists_config_define("FOREGROUND");
|
|
}
|
|
|
|
/* sigh, want this only the second time around */
|
|
retained = ap_retained_data_get(userdata_key);
|
|
if (!retained) {
|
|
retained = ap_retained_data_create(userdata_key, sizeof(*retained));
|
|
retained->max_daemons_limit = -1;
|
|
}
|
|
++retained->module_loads;
|
|
if (retained->module_loads == 2) {
|
|
/* test for correct operation of fdqueue */
|
|
static apr_uint32_t foo1, foo2;
|
|
|
|
apr_atomic_set32(&foo1, 100);
|
|
foo2 = apr_atomic_add32(&foo1, -10);
|
|
if (foo2 != 100 || foo1 != 90) {
|
|
ap_log_error(APLOG_MARK, APLOG_CRIT, 0, NULL, APLOGNO(02405)
|
|
"atomics not working as expected - add32 of negative number");
|
|
return HTTP_INTERNAL_SERVER_ERROR;
|
|
}
|
|
|
|
rv = apr_pollset_create(&event_pollset, 1, plog,
|
|
APR_POLLSET_THREADSAFE | APR_POLLSET_NOCOPY);
|
|
if (rv != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL, APLOGNO(00495)
|
|
"Couldn't create a Thread Safe Pollset. "
|
|
"Is it supported on your platform?"
|
|
"Also check system or user limits!");
|
|
return HTTP_INTERNAL_SERVER_ERROR;
|
|
}
|
|
apr_pollset_destroy(event_pollset);
|
|
|
|
if (!one_process && !foreground) {
|
|
/* before we detach, setup crash handlers to log to errorlog */
|
|
ap_fatal_signal_setup(ap_server_conf, pconf);
|
|
rv = apr_proc_detach(no_detach ? APR_PROC_DETACH_FOREGROUND
|
|
: APR_PROC_DETACH_DAEMONIZE);
|
|
if (rv != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL, APLOGNO(00496)
|
|
"apr_proc_detach failed");
|
|
return HTTP_INTERNAL_SERVER_ERROR;
|
|
}
|
|
}
|
|
}
|
|
|
|
parent_pid = ap_my_pid = getpid();
|
|
|
|
ap_listen_pre_config();
|
|
ap_daemons_to_start = DEFAULT_START_DAEMON;
|
|
min_spare_threads = DEFAULT_MIN_FREE_DAEMON * DEFAULT_THREADS_PER_CHILD;
|
|
max_spare_threads = DEFAULT_MAX_FREE_DAEMON * DEFAULT_THREADS_PER_CHILD;
|
|
server_limit = DEFAULT_SERVER_LIMIT;
|
|
thread_limit = DEFAULT_THREAD_LIMIT;
|
|
ap_daemons_limit = server_limit;
|
|
threads_per_child = DEFAULT_THREADS_PER_CHILD;
|
|
max_workers = ap_daemons_limit * threads_per_child;
|
|
had_healthy_child = 0;
|
|
ap_extended_status = 0;
|
|
|
|
return OK;
|
|
}
|
|
|
|
static int event_check_config(apr_pool_t *p, apr_pool_t *plog,
|
|
apr_pool_t *ptemp, server_rec *s)
|
|
{
|
|
int startup = 0;
|
|
|
|
/* the reverse of pre_config, we want this only the first time around */
|
|
if (retained->module_loads == 1) {
|
|
startup = 1;
|
|
}
|
|
|
|
if (server_limit > MAX_SERVER_LIMIT) {
|
|
if (startup) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00497)
|
|
"WARNING: ServerLimit of %d exceeds compile-time "
|
|
"limit of", server_limit);
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
|
|
" %d servers, decreasing to %d.",
|
|
MAX_SERVER_LIMIT, MAX_SERVER_LIMIT);
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00498)
|
|
"ServerLimit of %d exceeds compile-time limit "
|
|
"of %d, decreasing to match",
|
|
server_limit, MAX_SERVER_LIMIT);
|
|
}
|
|
server_limit = MAX_SERVER_LIMIT;
|
|
}
|
|
else if (server_limit < 1) {
|
|
if (startup) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00499)
|
|
"WARNING: ServerLimit of %d not allowed, "
|
|
"increasing to 1.", server_limit);
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00500)
|
|
"ServerLimit of %d not allowed, increasing to 1",
|
|
server_limit);
|
|
}
|
|
server_limit = 1;
|
|
}
|
|
|
|
/* you cannot change ServerLimit across a restart; ignore
|
|
* any such attempts
|
|
*/
|
|
if (!retained->first_server_limit) {
|
|
retained->first_server_limit = server_limit;
|
|
}
|
|
else if (server_limit != retained->first_server_limit) {
|
|
/* don't need a startup console version here */
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00501)
|
|
"changing ServerLimit to %d from original value of %d "
|
|
"not allowed during restart",
|
|
server_limit, retained->first_server_limit);
|
|
server_limit = retained->first_server_limit;
|
|
}
|
|
|
|
if (thread_limit > MAX_THREAD_LIMIT) {
|
|
if (startup) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00502)
|
|
"WARNING: ThreadLimit of %d exceeds compile-time "
|
|
"limit of", thread_limit);
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
|
|
" %d threads, decreasing to %d.",
|
|
MAX_THREAD_LIMIT, MAX_THREAD_LIMIT);
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00503)
|
|
"ThreadLimit of %d exceeds compile-time limit "
|
|
"of %d, decreasing to match",
|
|
thread_limit, MAX_THREAD_LIMIT);
|
|
}
|
|
thread_limit = MAX_THREAD_LIMIT;
|
|
}
|
|
else if (thread_limit < 1) {
|
|
if (startup) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00504)
|
|
"WARNING: ThreadLimit of %d not allowed, "
|
|
"increasing to 1.", thread_limit);
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00505)
|
|
"ThreadLimit of %d not allowed, increasing to 1",
|
|
thread_limit);
|
|
}
|
|
thread_limit = 1;
|
|
}
|
|
|
|
/* you cannot change ThreadLimit across a restart; ignore
|
|
* any such attempts
|
|
*/
|
|
if (!retained->first_thread_limit) {
|
|
retained->first_thread_limit = thread_limit;
|
|
}
|
|
else if (thread_limit != retained->first_thread_limit) {
|
|
/* don't need a startup console version here */
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00506)
|
|
"changing ThreadLimit to %d from original value of %d "
|
|
"not allowed during restart",
|
|
thread_limit, retained->first_thread_limit);
|
|
thread_limit = retained->first_thread_limit;
|
|
}
|
|
|
|
if (threads_per_child > thread_limit) {
|
|
if (startup) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00507)
|
|
"WARNING: ThreadsPerChild of %d exceeds ThreadLimit "
|
|
"of", threads_per_child);
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
|
|
" %d threads, decreasing to %d.",
|
|
thread_limit, thread_limit);
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
|
|
" To increase, please see the ThreadLimit "
|
|
"directive.");
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00508)
|
|
"ThreadsPerChild of %d exceeds ThreadLimit "
|
|
"of %d, decreasing to match",
|
|
threads_per_child, thread_limit);
|
|
}
|
|
threads_per_child = thread_limit;
|
|
}
|
|
else if (threads_per_child < 1) {
|
|
if (startup) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00509)
|
|
"WARNING: ThreadsPerChild of %d not allowed, "
|
|
"increasing to 1.", threads_per_child);
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00510)
|
|
"ThreadsPerChild of %d not allowed, increasing to 1",
|
|
threads_per_child);
|
|
}
|
|
threads_per_child = 1;
|
|
}
|
|
|
|
if (max_workers < threads_per_child) {
|
|
if (startup) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00511)
|
|
"WARNING: MaxRequestWorkers of %d is less than "
|
|
"ThreadsPerChild of", max_workers);
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
|
|
" %d, increasing to %d. MaxRequestWorkers must be at "
|
|
"least as large",
|
|
threads_per_child, threads_per_child);
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
|
|
" as the number of threads in a single server.");
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00512)
|
|
"MaxRequestWorkers of %d is less than ThreadsPerChild "
|
|
"of %d, increasing to match",
|
|
max_workers, threads_per_child);
|
|
}
|
|
max_workers = threads_per_child;
|
|
}
|
|
|
|
ap_daemons_limit = max_workers / threads_per_child;
|
|
|
|
if (max_workers % threads_per_child) {
|
|
int tmp_max_workers = ap_daemons_limit * threads_per_child;
|
|
|
|
if (startup) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00513)
|
|
"WARNING: MaxRequestWorkers of %d is not an integer "
|
|
"multiple of", max_workers);
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
|
|
" ThreadsPerChild of %d, decreasing to nearest "
|
|
"multiple %d,", threads_per_child,
|
|
tmp_max_workers);
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
|
|
" for a maximum of %d servers.",
|
|
ap_daemons_limit);
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00514)
|
|
"MaxRequestWorkers of %d is not an integer multiple "
|
|
"of ThreadsPerChild of %d, decreasing to nearest "
|
|
"multiple %d", max_workers, threads_per_child,
|
|
tmp_max_workers);
|
|
}
|
|
max_workers = tmp_max_workers;
|
|
}
|
|
|
|
if (ap_daemons_limit > server_limit) {
|
|
if (startup) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00515)
|
|
"WARNING: MaxRequestWorkers of %d would require %d "
|
|
"servers and ", max_workers, ap_daemons_limit);
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
|
|
" would exceed ServerLimit of %d, decreasing to %d.",
|
|
server_limit, server_limit * threads_per_child);
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
|
|
" To increase, please see the ServerLimit "
|
|
"directive.");
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00516)
|
|
"MaxRequestWorkers of %d would require %d servers and "
|
|
"exceed ServerLimit of %d, decreasing to %d",
|
|
max_workers, ap_daemons_limit, server_limit,
|
|
server_limit * threads_per_child);
|
|
}
|
|
ap_daemons_limit = server_limit;
|
|
}
|
|
|
|
/* ap_daemons_to_start > ap_daemons_limit checked in ap_mpm_run() */
|
|
if (ap_daemons_to_start < 1) {
|
|
if (startup) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00517)
|
|
"WARNING: StartServers of %d not allowed, "
|
|
"increasing to 1.", ap_daemons_to_start);
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00518)
|
|
"StartServers of %d not allowed, increasing to 1",
|
|
ap_daemons_to_start);
|
|
}
|
|
ap_daemons_to_start = 1;
|
|
}
|
|
|
|
if (min_spare_threads < 1) {
|
|
if (startup) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00519)
|
|
"WARNING: MinSpareThreads of %d not allowed, "
|
|
"increasing to 1", min_spare_threads);
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
|
|
" to avoid almost certain server failure.");
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
|
|
" Please read the documentation.");
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00520)
|
|
"MinSpareThreads of %d not allowed, increasing to 1",
|
|
min_spare_threads);
|
|
}
|
|
min_spare_threads = 1;
|
|
}
|
|
|
|
/* max_spare_threads < min_spare_threads + threads_per_child
|
|
* checked in ap_mpm_run()
|
|
*/
|
|
|
|
return OK;
|
|
}
|
|
|
|
static void event_hooks(apr_pool_t * p)
|
|
{
|
|
/* Our open_logs hook function must run before the core's, or stderr
|
|
* will be redirected to a file, and the messages won't print to the
|
|
* console.
|
|
*/
|
|
static const char *const aszSucc[] = { "core.c", NULL };
|
|
one_process = 0;
|
|
ap_force_set_tz(p);
|
|
|
|
ap_hook_open_logs(event_open_logs, NULL, aszSucc, APR_HOOK_REALLY_FIRST);
|
|
/* we need to set the MPM state before other pre-config hooks use MPM query
|
|
* to retrieve it, so register as REALLY_FIRST
|
|
*/
|
|
ap_hook_pre_config(event_pre_config, NULL, NULL, APR_HOOK_REALLY_FIRST);
|
|
ap_hook_check_config(event_check_config, NULL, NULL, APR_HOOK_MIDDLE);
|
|
ap_hook_mpm(event_run, NULL, NULL, APR_HOOK_MIDDLE);
|
|
ap_hook_mpm_query(event_query, NULL, NULL, APR_HOOK_MIDDLE);
|
|
ap_hook_mpm_register_timed_callback(event_register_timed_callback, NULL, NULL,
|
|
APR_HOOK_MIDDLE);
|
|
ap_hook_mpm_register_socket_callback(event_register_socket_callback, NULL, NULL,
|
|
APR_HOOK_MIDDLE);
|
|
ap_hook_mpm_register_socket_callback_timeout(event_register_socket_callback_ex, NULL, NULL,
|
|
APR_HOOK_MIDDLE);
|
|
ap_hook_mpm_unregister_socket_callback(event_unregister_socket_callback, NULL, NULL,
|
|
APR_HOOK_MIDDLE);
|
|
ap_hook_pre_read_request(event_pre_read_request, NULL, NULL, APR_HOOK_MIDDLE);
|
|
ap_hook_mpm_get_name(event_get_name, NULL, NULL, APR_HOOK_MIDDLE);
|
|
ap_hook_mpm_resume_suspended(event_resume_suspended, NULL, NULL, APR_HOOK_MIDDLE);
|
|
}
|
|
|
|
static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy,
|
|
const char *arg)
|
|
{
|
|
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
|
|
if (err != NULL) {
|
|
return err;
|
|
}
|
|
|
|
ap_daemons_to_start = atoi(arg);
|
|
return NULL;
|
|
}
|
|
|
|
static const char *set_min_spare_threads(cmd_parms * cmd, void *dummy,
|
|
const char *arg)
|
|
{
|
|
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
|
|
if (err != NULL) {
|
|
return err;
|
|
}
|
|
|
|
min_spare_threads = atoi(arg);
|
|
return NULL;
|
|
}
|
|
|
|
static const char *set_max_spare_threads(cmd_parms * cmd, void *dummy,
|
|
const char *arg)
|
|
{
|
|
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
|
|
if (err != NULL) {
|
|
return err;
|
|
}
|
|
|
|
max_spare_threads = atoi(arg);
|
|
return NULL;
|
|
}
|
|
|
|
static const char *set_max_workers(cmd_parms * cmd, void *dummy,
|
|
const char *arg)
|
|
{
|
|
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
|
|
if (err != NULL) {
|
|
return err;
|
|
}
|
|
if (!strcasecmp(cmd->cmd->name, "MaxClients")) {
|
|
ap_log_error(APLOG_MARK, APLOG_INFO, 0, NULL, APLOGNO(00521)
|
|
"MaxClients is deprecated, use MaxRequestWorkers "
|
|
"instead.");
|
|
}
|
|
max_workers = atoi(arg);
|
|
return NULL;
|
|
}
|
|
|
|
static const char *set_threads_per_child(cmd_parms * cmd, void *dummy,
|
|
const char *arg)
|
|
{
|
|
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
|
|
if (err != NULL) {
|
|
return err;
|
|
}
|
|
|
|
threads_per_child = atoi(arg);
|
|
return NULL;
|
|
}
|
|
static const char *set_server_limit (cmd_parms *cmd, void *dummy, const char *arg)
|
|
{
|
|
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
|
|
if (err != NULL) {
|
|
return err;
|
|
}
|
|
|
|
server_limit = atoi(arg);
|
|
return NULL;
|
|
}
|
|
|
|
static const char *set_thread_limit(cmd_parms * cmd, void *dummy,
|
|
const char *arg)
|
|
{
|
|
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
|
|
if (err != NULL) {
|
|
return err;
|
|
}
|
|
|
|
thread_limit = atoi(arg);
|
|
return NULL;
|
|
}
|
|
|
|
static const char *set_worker_factor(cmd_parms * cmd, void *dummy,
|
|
const char *arg)
|
|
{
|
|
double val;
|
|
char *endptr;
|
|
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
|
|
if (err != NULL) {
|
|
return err;
|
|
}
|
|
|
|
val = strtod(arg, &endptr);
|
|
if (*endptr)
|
|
return "error parsing value";
|
|
|
|
if (val <= 0)
|
|
return "AsyncRequestWorkerFactor argument must be a positive number";
|
|
|
|
worker_factor = val * WORKER_FACTOR_SCALE;
|
|
if (worker_factor == 0)
|
|
worker_factor = 1;
|
|
return NULL;
|
|
}
|
|
|
|
|
|
static const command_rec event_cmds[] = {
|
|
LISTEN_COMMANDS,
|
|
AP_INIT_TAKE1("StartServers", set_daemons_to_start, NULL, RSRC_CONF,
|
|
"Number of child processes launched at server startup"),
|
|
AP_INIT_TAKE1("ServerLimit", set_server_limit, NULL, RSRC_CONF,
|
|
"Maximum number of child processes for this run of Apache"),
|
|
AP_INIT_TAKE1("MinSpareThreads", set_min_spare_threads, NULL, RSRC_CONF,
|
|
"Minimum number of idle threads, to handle request spikes"),
|
|
AP_INIT_TAKE1("MaxSpareThreads", set_max_spare_threads, NULL, RSRC_CONF,
|
|
"Maximum number of idle threads"),
|
|
AP_INIT_TAKE1("MaxClients", set_max_workers, NULL, RSRC_CONF,
|
|
"Deprecated name of MaxRequestWorkers"),
|
|
AP_INIT_TAKE1("MaxRequestWorkers", set_max_workers, NULL, RSRC_CONF,
|
|
"Maximum number of threads alive at the same time"),
|
|
AP_INIT_TAKE1("ThreadsPerChild", set_threads_per_child, NULL, RSRC_CONF,
|
|
"Number of threads each child creates"),
|
|
AP_INIT_TAKE1("ThreadLimit", set_thread_limit, NULL, RSRC_CONF,
|
|
"Maximum number of worker threads per child process for this "
|
|
"run of Apache - Upper limit for ThreadsPerChild"),
|
|
AP_INIT_TAKE1("AsyncRequestWorkerFactor", set_worker_factor, NULL, RSRC_CONF,
|
|
"How many additional connects will be accepted per idle "
|
|
"worker thread"),
|
|
AP_GRACEFUL_SHUTDOWN_TIMEOUT_COMMAND,
|
|
{NULL}
|
|
};
|
|
|
|
AP_DECLARE_MODULE(mpm_event) = {
|
|
MPM20_MODULE_STUFF,
|
|
NULL, /* hook to run before apache parses args */
|
|
NULL, /* create per-directory config structure */
|
|
NULL, /* merge per-directory config structures */
|
|
NULL, /* create per-server config structure */
|
|
NULL, /* merge per-server config structures */
|
|
event_cmds, /* command apr_table_t */
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event_hooks /* register_hooks */
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};
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