3a9eb648bb
1999-08-15 Ulrich Drepper <drepper@cygnus.com> * sysdeps/unix/sysv/linux/aio_sigqueue.c: Take extra parameter and initialize si_pid from it. * sysdeps/generic/aio_sigqueue.c (__aio_sigqueue): Take extra parameter. * rt/aio_misc.c (__aio_enqueue_request): Initialize caller_pid. * rt/aio_misc.h (struct waitlist): Add caller_pid element. (struct requestlist): Likewise. Adjust prototypes of __aio_notify_only and __aio_sigqueue. * rt/notify.c (__aio_notify_only): Take extra parameter. Pass it to __aio_sigqueue. (__aio_notify): Pass caller PID to __aio_notify_only. * rt/aio_suspend.c: Initialize caller_pid. * rt/lio_listio.c: Likewise. * rt/lio_listio64.c: Likewise. * rt/lio_listio.c: If nothing has to be done free mutex before signalling. * rt/lio_listio64.c: Likewise.
134 lines
4.2 KiB
C
134 lines
4.2 KiB
C
/* Suspend until termination of a requests.
|
|
Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
|
|
/* We use an UGLY hack to prevent gcc from finding us cheating. The
|
|
implementation of aio_suspend and aio_suspend64 are identical and so
|
|
we want to avoid code duplication by using aliases. But gcc sees
|
|
the different parameter lists and prints a warning. We define here
|
|
a function so that aio_suspend64 has no prototype. */
|
|
#define aio_suspend64 XXX
|
|
#include <aio.h>
|
|
/* And undo the hack. */
|
|
#undef aio_suspend64
|
|
|
|
#include <errno.h>
|
|
|
|
#include "aio_misc.h"
|
|
|
|
|
|
int
|
|
aio_suspend (list, nent, timeout)
|
|
const struct aiocb *const list[];
|
|
int nent;
|
|
const struct timespec *timeout;
|
|
{
|
|
struct waitlist waitlist[nent];
|
|
struct requestlist *requestlist[nent];
|
|
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
|
|
int cnt;
|
|
int result = 0;
|
|
int dummy;
|
|
int none = 1;
|
|
|
|
/* Request the mutex. */
|
|
pthread_mutex_lock (&__aio_requests_mutex);
|
|
|
|
/* There is not yet a finished request. Signal the request that
|
|
we are working for it. */
|
|
for (cnt = 0; cnt < nent; ++cnt)
|
|
if (list[cnt] != NULL && list[cnt]->__error_code == EINPROGRESS)
|
|
{
|
|
requestlist[cnt] = __aio_find_req ((aiocb_union *) list[cnt]);
|
|
|
|
if (requestlist[cnt] != NULL)
|
|
{
|
|
waitlist[cnt].cond = &cond;
|
|
waitlist[cnt].next = requestlist[cnt]->waiting;
|
|
waitlist[cnt].counterp = &dummy;
|
|
waitlist[cnt].sigevp = NULL;
|
|
waitlist[cnt].caller_pid = 0; /* Not needed. */
|
|
requestlist[cnt]->waiting = &waitlist[cnt];
|
|
none = 0;
|
|
}
|
|
}
|
|
|
|
/* If there is a not finished request wait for it. */
|
|
if (!none)
|
|
{
|
|
int oldstate;
|
|
|
|
/* Since `pthread_cond_wait'/`pthread_cond_timedwait' are cancelation
|
|
points we must be careful. We added entries to the waiting lists
|
|
which we must remove. So defer cancelation for now. */
|
|
pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &oldstate);
|
|
|
|
if (timeout == NULL)
|
|
result = pthread_cond_wait (&cond, &__aio_requests_mutex);
|
|
else
|
|
result = pthread_cond_timedwait (&cond, &__aio_requests_mutex,
|
|
timeout);
|
|
|
|
/* Now remove the entry in the waiting list for all requests
|
|
which didn't terminate. */
|
|
for (cnt = 0; cnt < nent; ++cnt)
|
|
if (list[cnt] != NULL && list[cnt]->__error_code == EINPROGRESS
|
|
&& requestlist[cnt] != NULL)
|
|
{
|
|
struct waitlist **listp = &requestlist[cnt]->waiting;
|
|
|
|
/* There is the chance that we cannot find our entry anymore.
|
|
This could happen if the request terminated and restarted
|
|
again. */
|
|
while (*listp != NULL && *listp != &waitlist[cnt])
|
|
listp = &(*listp)->next;
|
|
|
|
if (*listp != NULL)
|
|
*listp = (*listp)->next;
|
|
}
|
|
|
|
/* Now it's time to restore the cancelation state. */
|
|
pthread_setcancelstate (oldstate, NULL);
|
|
|
|
/* Release the conditional variable. */
|
|
if (pthread_cond_destroy (&cond) != 0)
|
|
/* This must never happen. */
|
|
abort ();
|
|
|
|
if (result != 0)
|
|
{
|
|
/* An error occurred. Possibly it's EINTR. We have to translate
|
|
the timeout error report of `pthread_cond_timedwait' to the
|
|
form expected from `aio_suspend'. */
|
|
if (result == ETIMEDOUT)
|
|
__set_errno (EAGAIN);
|
|
|
|
result = -1;
|
|
}
|
|
}
|
|
|
|
/* Release the mutex. */
|
|
pthread_mutex_unlock (&__aio_requests_mutex);
|
|
|
|
return result;
|
|
}
|
|
|
|
weak_alias (aio_suspend, aio_suspend64)
|