mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-23 11:20:07 +00:00
110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/* Notify initiator of AIO request.
|
|
Copyright (C) 1997, 1998, 1999, 2000 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. */
|
|
|
|
#include <errno.h>
|
|
#include <pthread.h>
|
|
#include <stdlib.h>
|
|
#include "aio_misc.h"
|
|
|
|
|
|
static void *
|
|
notify_func_wrapper (void *arg)
|
|
{
|
|
struct sigevent *sigev = arg;
|
|
sigev->sigev_notify_function (sigev->sigev_value);
|
|
return NULL;
|
|
}
|
|
|
|
|
|
int
|
|
internal_function
|
|
__aio_notify_only (struct sigevent *sigev, pid_t caller_pid)
|
|
{
|
|
int result = 0;
|
|
|
|
/* Send the signal to notify about finished processing of the request. */
|
|
if (sigev->sigev_notify == SIGEV_THREAD)
|
|
{
|
|
/* We have to start a thread. */
|
|
pthread_t tid;
|
|
pthread_attr_t attr, *pattr;
|
|
|
|
pattr = (pthread_attr_t *) sigev->sigev_notify_attributes;
|
|
if (pattr == NULL)
|
|
{
|
|
pthread_attr_init (&attr);
|
|
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
|
|
pattr = &attr;
|
|
}
|
|
|
|
if (pthread_create (&tid, pattr, notify_func_wrapper, sigev) < 0)
|
|
result = -1;
|
|
}
|
|
else if (sigev->sigev_notify == SIGEV_SIGNAL)
|
|
/* We have to send a signal. */
|
|
if (__aio_sigqueue (sigev->sigev_signo, sigev->sigev_value, caller_pid)
|
|
< 0)
|
|
result = -1;
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
void
|
|
internal_function
|
|
__aio_notify (struct requestlist *req)
|
|
{
|
|
struct waitlist *waitlist;
|
|
struct aiocb *aiocbp = &req->aiocbp->aiocb;
|
|
|
|
if (__aio_notify_only (&aiocbp->aio_sigevent, req->caller_pid) != 0)
|
|
{
|
|
/* XXX What shall we do if already an error is set by
|
|
read/write/fsync? */
|
|
aiocbp->__error_code = errno;
|
|
aiocbp->__return_value = -1;
|
|
}
|
|
|
|
/* Now also notify possibly waiting threads. */
|
|
waitlist = req->waiting;
|
|
while (waitlist != NULL)
|
|
{
|
|
struct waitlist *next = waitlist->next;
|
|
|
|
/* Decrement the counter. This is used in both cases. */
|
|
--*waitlist->counterp;
|
|
|
|
if (waitlist->sigevp == NULL)
|
|
pthread_cond_signal (waitlist->cond);
|
|
else
|
|
/* This is part of a asynchronous `lio_listio' operation. If
|
|
this request is the last one, send the signal. */
|
|
if (*waitlist->counterp == 0)
|
|
{
|
|
__aio_notify_only (waitlist->sigevp, waitlist->caller_pid);
|
|
/* This is tricky. See lio_listio.c for the reason why
|
|
this works. */
|
|
free ((void *) waitlist->counterp);
|
|
}
|
|
|
|
waitlist = next;
|
|
}
|
|
}
|