mirror of
https://github.com/MariaDB/server.git
synced 2025-11-03 14:33:32 +03:00
294 lines
8.0 KiB
C
294 lines
8.0 KiB
C
/* Copyright (C) 2000 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/*
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Functions to handle initializating and allocationg of all mysys & debug
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thread variables.
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*/
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#include "mysys_priv.h"
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#include <m_string.h>
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#ifdef THREAD
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#ifdef USE_TLS
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pthread_key(struct st_my_thread_var*, THR_KEY_mysys);
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#else
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pthread_key(struct st_my_thread_var, THR_KEY_mysys);
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#endif /* USE_TLS */
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pthread_mutex_t THR_LOCK_malloc,THR_LOCK_open,
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THR_LOCK_lock,THR_LOCK_isam,THR_LOCK_myisam,THR_LOCK_heap,
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THR_LOCK_net, THR_LOCK_charset;
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#if !defined(HAVE_LOCALTIME_R) || !defined(HAVE_GMTIME_R)
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pthread_mutex_t LOCK_localtime_r;
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#endif
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#ifndef HAVE_GETHOSTBYNAME_R
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pthread_mutex_t LOCK_gethostbyname_r;
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#endif
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#ifdef PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
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pthread_mutexattr_t my_fast_mutexattr;
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#endif
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#ifdef PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP
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pthread_mutexattr_t my_errorcheck_mutexattr;
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#endif
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/*
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initialize thread environment
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SYNOPSIS
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my_thread_global_init()
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RETURN
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0 ok
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1 error (Couldn't create THR_KEY_mysys)
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*/
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my_bool my_thread_global_init(void)
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{
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if (pthread_key_create(&THR_KEY_mysys,0))
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{
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fprintf(stderr,"Can't initialize threads: error %d\n",errno);
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return 1;
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}
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#ifdef PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
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/*
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Set mutex type to "fast" a.k.a "adaptive"
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The mutex kind determines what happens if a thread attempts to lock
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a mutex it already owns with pthread_mutex_lock(3). If the mutex
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is of the ``fast'' kind, pthread_mutex_lock(3) simply suspends
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the calling thread forever. If the mutex is of the ``error checking''
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kind, pthread_mutex_lock(3) returns immediately with the error
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code EDEADLK.
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*/
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pthread_mutexattr_init(&my_fast_mutexattr);
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pthread_mutexattr_settype(&my_fast_mutexattr,
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PTHREAD_MUTEX_ADAPTIVE_NP);
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#endif
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#ifdef PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP
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/*
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Set mutex type to "errorcheck" a.k.a "adaptive"
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*/
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pthread_mutexattr_init(&my_errorcheck_mutexattr);
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pthread_mutexattr_settype(&my_errorcheck_mutexattr,
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PTHREAD_MUTEX_ERRORCHECK);
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#endif
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pthread_mutex_init(&THR_LOCK_malloc,MY_MUTEX_INIT_FAST);
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pthread_mutex_init(&THR_LOCK_open,MY_MUTEX_INIT_FAST);
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pthread_mutex_init(&THR_LOCK_lock,MY_MUTEX_INIT_FAST);
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pthread_mutex_init(&THR_LOCK_isam,MY_MUTEX_INIT_SLOW);
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pthread_mutex_init(&THR_LOCK_myisam,MY_MUTEX_INIT_SLOW);
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pthread_mutex_init(&THR_LOCK_heap,MY_MUTEX_INIT_FAST);
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pthread_mutex_init(&THR_LOCK_net,MY_MUTEX_INIT_FAST);
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pthread_mutex_init(&THR_LOCK_charset,MY_MUTEX_INIT_FAST);
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#if defined( __WIN__) || defined(OS2)
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win_pthread_init();
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#endif
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#if !defined(HAVE_LOCALTIME_R) || !defined(HAVE_GMTIME_R)
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pthread_mutex_init(&LOCK_localtime_r,MY_MUTEX_INIT_SLOW);
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#endif
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#ifndef HAVE_GETHOSTBYNAME_R
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pthread_mutex_init(&LOCK_gethostbyname_r,MY_MUTEX_INIT_SLOW);
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#endif
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if (my_thread_init())
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{
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my_thread_global_end(); /* Clean up */
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return 1;
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}
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return 0;
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}
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void my_thread_global_end(void)
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{
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pthread_key_delete(THR_KEY_mysys);
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#ifdef PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
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pthread_mutexattr_destroy(&my_fast_mutexattr);
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#endif
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#ifdef PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP
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pthread_mutexattr_destroy(&my_errorcheck_mutexattr);
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#endif
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pthread_mutex_destroy(&THR_LOCK_malloc);
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pthread_mutex_destroy(&THR_LOCK_open);
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pthread_mutex_destroy(&THR_LOCK_lock);
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pthread_mutex_destroy(&THR_LOCK_isam);
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pthread_mutex_destroy(&THR_LOCK_myisam);
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pthread_mutex_destroy(&THR_LOCK_heap);
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pthread_mutex_destroy(&THR_LOCK_net);
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pthread_mutex_destroy(&THR_LOCK_charset);
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#if !defined(HAVE_LOCALTIME_R) || !defined(HAVE_GMTIME_R)
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pthread_mutex_destroy(&LOCK_localtime_r);
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#endif
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#ifndef HAVE_GETHOSTBYNAME_R
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pthread_mutex_destroy(&LOCK_gethostbyname_r);
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#endif
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}
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static long thread_id=0;
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/*
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We can't use mutex_locks here if we are using windows as
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we may have compiled the program with SAFE_MUTEX, in which
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case the checking of mutex_locks will not work until
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the pthread_self thread specific variable is initialized.
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*/
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my_bool my_thread_init(void)
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{
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struct st_my_thread_var *tmp;
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my_bool error=0;
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#ifdef EXTRA_DEBUG_THREADS
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fprintf(stderr,"my_thread_init(): thread_id=%ld\n",pthread_self());
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#endif
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#if !defined(__WIN__) || defined(USE_TLS) || ! defined(SAFE_MUTEX)
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pthread_mutex_lock(&THR_LOCK_lock);
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#endif
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#if !defined(__WIN__) || defined(USE_TLS)
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if (my_pthread_getspecific(struct st_my_thread_var *,THR_KEY_mysys))
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{
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#ifdef EXTRA_DEBUG_THREADS
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fprintf(stderr,"my_thread_init() called more than once in thread %ld\n",
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pthread_self());
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#endif
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goto end;
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}
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if (!(tmp= (struct st_my_thread_var *) calloc(1, sizeof(*tmp))))
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{
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error= 1;
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goto end;
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}
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pthread_setspecific(THR_KEY_mysys,tmp);
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#else
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/*
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Skip initialization if the thread specific variable is already initialized
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*/
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if (THR_KEY_mysys.id)
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goto end;
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tmp= &THR_KEY_mysys;
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#endif
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tmp->id= ++thread_id;
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#if defined(__WIN__) && defined(EMBEDDED_LIBRARY)
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tmp->thread_self= (pthread_t)getpid();
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#endif
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pthread_mutex_init(&tmp->mutex,MY_MUTEX_INIT_FAST);
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pthread_cond_init(&tmp->suspend, NULL);
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tmp->init= 1;
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end:
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#if !defined(__WIN__) || defined(USE_TLS) || ! defined(SAFE_MUTEX)
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pthread_mutex_unlock(&THR_LOCK_lock);
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#endif
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return error;
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}
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void my_thread_end(void)
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{
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struct st_my_thread_var *tmp;
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tmp= my_pthread_getspecific(struct st_my_thread_var*,THR_KEY_mysys);
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#ifdef EXTRA_DEBUG_THREADS
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fprintf(stderr,"my_thread_end(): tmp=%p,thread_id=%ld\n",
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tmp,pthread_self());
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#endif
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if (tmp && tmp->init)
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{
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#if !defined(DBUG_OFF)
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/* tmp->dbug is allocated inside DBUG library */
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if (tmp->dbug)
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{
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free(tmp->dbug);
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tmp->dbug=0;
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}
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#endif
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#if !defined(__bsdi__) && !defined(__OpenBSD__) || defined(HAVE_mit_thread)
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/* bsdi and openbsd 3.5 dumps core here */
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pthread_cond_destroy(&tmp->suspend);
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#endif
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pthread_mutex_destroy(&tmp->mutex);
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#if (!defined(__WIN__) && !defined(OS2)) || defined(USE_TLS)
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free(tmp);
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#else
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tmp->init= 0;
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#endif
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}
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/* The following free has to be done, even if my_thread_var() is 0 */
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#if (!defined(__WIN__) && !defined(OS2)) || defined(USE_TLS)
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pthread_setspecific(THR_KEY_mysys,0);
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#endif
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}
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struct st_my_thread_var *_my_thread_var(void)
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{
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struct st_my_thread_var *tmp=
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my_pthread_getspecific(struct st_my_thread_var*,THR_KEY_mysys);
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#if defined(USE_TLS)
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/* This can only happen in a .DLL */
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if (!tmp)
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{
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my_thread_init();
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tmp=my_pthread_getspecific(struct st_my_thread_var*,THR_KEY_mysys);
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}
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#endif
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return tmp;
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}
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/****************************************************************************
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Get name of current thread.
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****************************************************************************/
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#define UNKNOWN_THREAD -1
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long my_thread_id()
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{
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#if defined(HAVE_PTHREAD_GETSEQUENCE_NP)
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return pthread_getsequence_np(pthread_self());
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#elif (defined(__sun) || defined(__sgi) || defined(__linux__)) && !defined(HAVE_mit_thread)
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return pthread_self();
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#else
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return my_thread_var->id;
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#endif
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}
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#ifdef DBUG_OFF
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const char *my_thread_name(void)
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{
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return "no_name";
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}
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#else
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const char *my_thread_name(void)
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{
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char name_buff[100];
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struct st_my_thread_var *tmp=my_thread_var;
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if (!tmp->name[0])
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{
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long id=my_thread_id();
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sprintf(name_buff,"T@%ld", id);
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strmake(tmp->name,name_buff,THREAD_NAME_SIZE);
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}
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return tmp->name;
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}
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#endif /* DBUG_OFF */
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#endif /* THREAD */
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