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144 lines
3.7 KiB
C
144 lines
3.7 KiB
C
/* Copyright (C) 1997-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _AIO_MISC_H
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#define _AIO_MISC_H 1
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#include <aio.h>
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#include <pthread.h>
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/* Extend the operation enum. */
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enum
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{
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LIO_DSYNC = LIO_NOP + 1,
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LIO_SYNC,
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LIO_READ64 = LIO_READ | 128,
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LIO_WRITE64 = LIO_WRITE | 128
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};
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/* Union of the two request types. */
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typedef union
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{
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struct aiocb aiocb;
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struct aiocb64 aiocb64;
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} aiocb_union;
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/* Used to synchronize. */
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struct waitlist
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{
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struct waitlist *next;
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/* The next two fields is used in synchronous `lio_listio' operations. */
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#ifndef DONT_NEED_AIO_MISC_COND
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pthread_cond_t *cond;
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#endif
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int *result;
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volatile unsigned int *counterp;
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/* The next field is used in asynchronous `lio_listio' operations. */
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struct sigevent *sigevp;
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#ifdef BROKEN_THREAD_SIGNALS
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/* XXX See requestlist, it's used to work around the broken signal
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handling in Linux. */
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pid_t caller_pid;
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#endif
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};
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/* Status of a request. */
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enum
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{
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no,
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queued,
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yes,
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allocated,
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done
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};
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/* Used to queue requests.. */
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struct requestlist
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{
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int running;
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struct requestlist *last_fd;
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struct requestlist *next_fd;
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struct requestlist *next_prio;
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struct requestlist *next_run;
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/* Pointer to the actual data. */
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aiocb_union *aiocbp;
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#ifdef BROKEN_THREAD_SIGNALS
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/* PID of the initiator thread.
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XXX This is only necessary for the broken signal handling on Linux. */
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pid_t caller_pid;
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#endif
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/* List of waiting processes. */
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struct waitlist *waiting;
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};
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/* Lock for global I/O list of requests. */
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extern pthread_mutex_t __aio_requests_mutex attribute_hidden;
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/* Enqueue request. */
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extern struct requestlist *__aio_enqueue_request (aiocb_union *aiocbp,
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int operation)
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attribute_hidden internal_function;
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/* Find request entry for given AIO control block. */
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extern struct requestlist *__aio_find_req (aiocb_union *elem)
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attribute_hidden internal_function;
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/* Find request entry for given file descriptor. */
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extern struct requestlist *__aio_find_req_fd (int fildes)
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attribute_hidden internal_function;
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/* Remove request from the list. */
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extern void __aio_remove_request (struct requestlist *last,
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struct requestlist *req, int all)
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attribute_hidden internal_function;
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/* Release the entry for the request. */
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extern void __aio_free_request (struct requestlist *req)
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attribute_hidden internal_function;
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/* Notify initiator of request and tell this everybody listening. */
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extern void __aio_notify (struct requestlist *req)
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attribute_hidden internal_function;
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/* Notify initiator of request. */
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#ifdef BROKEN_THREAD_SIGNALS
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extern int __aio_notify_only (struct sigevent *sigev, pid_t caller_pid)
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attribute_hidden internal_function;
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#else
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extern int __aio_notify_only (struct sigevent *sigev)
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attribute_hidden internal_function;
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#endif
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/* Send the signal. */
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extern int __aio_sigqueue (int sig, const union sigval val, pid_t caller_pid)
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attribute_hidden internal_function;
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#endif /* aio_misc.h */
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