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41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
120 lines
3.4 KiB
C
120 lines
3.4 KiB
C
/* Notify initiator of AIO request.
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Copyright (C) 1997,98,99,2000,01 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "aio_misc.h"
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static void *
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notify_func_wrapper (void *arg)
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{
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struct sigevent *sigev = arg;
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sigev->sigev_notify_function (sigev->sigev_value);
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return NULL;
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}
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int
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internal_function
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__aio_notify_only (struct sigevent *sigev, pid_t caller_pid)
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{
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int result = 0;
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/* Send the signal to notify about finished processing of the request. */
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if (sigev->sigev_notify == SIGEV_THREAD)
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{
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/* We have to start a thread. */
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pthread_t tid;
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pthread_attr_t attr, *pattr;
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pattr = (pthread_attr_t *) sigev->sigev_notify_attributes;
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if (pattr == NULL)
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{
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pthread_attr_init (&attr);
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pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
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pattr = &attr;
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}
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if (pthread_create (&tid, pattr, notify_func_wrapper, sigev) < 0)
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result = -1;
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}
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else if (sigev->sigev_notify == SIGEV_SIGNAL)
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{
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/* We have to send a signal. */
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#if _POSIX_REALTIME_SIGNALS
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/* Note that the standard gives us the option of using a plain
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non-queuing signal here when SA_SIGINFO is not set for the signal. */
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if (__aio_sigqueue (sigev->sigev_signo, sigev->sigev_value, caller_pid)
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< 0)
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result = -1;
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#else
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/* There are no queued signals on this system at all. */
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result = raise (sigev->sigev_signo);
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#endif
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}
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return result;
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}
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void
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internal_function
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__aio_notify (struct requestlist *req)
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{
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struct waitlist *waitlist;
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struct aiocb *aiocbp = &req->aiocbp->aiocb;
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if (__aio_notify_only (&aiocbp->aio_sigevent, req->caller_pid) != 0)
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{
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/* XXX What shall we do if already an error is set by
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read/write/fsync? */
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aiocbp->__error_code = errno;
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aiocbp->__return_value = -1;
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}
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/* Now also notify possibly waiting threads. */
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waitlist = req->waiting;
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while (waitlist != NULL)
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{
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struct waitlist *next = waitlist->next;
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/* Decrement the counter. This is used in both cases. */
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--*waitlist->counterp;
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if (waitlist->sigevp == NULL)
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pthread_cond_signal (waitlist->cond);
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else
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/* This is part of a asynchronous `lio_listio' operation. If
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this request is the last one, send the signal. */
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if (*waitlist->counterp == 0)
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{
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__aio_notify_only (waitlist->sigevp, waitlist->caller_pid);
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/* This is tricky. See lio_listio.c for the reason why
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this works. */
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free ((void *) waitlist->counterp);
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}
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waitlist = next;
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}
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}
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