d349482e96
2006-02-25 Shantonu Sen <ssen@opendarwin.org> * config/posix/sem.h: Define BROKEN_POSIX_SEMAPHORES functions. * config/posix/sem.c: Implement the above. 2006-02-25 Andreas Tobler <a.tobler@schweiz.ch> * configure.ac (HAVE_BROKEN_POSIX_SEMAPHORES): Check for darwin and define HAVE_BROKEN_POSIX_SEMAPHORES. * configure: Rebuilt. * config.h.in: Rebuilt. From-SVN: r111441
127 lines
3.1 KiB
C
127 lines
3.1 KiB
C
/* Copyright (C) 2005, 2006 Free Software Foundation, Inc.
|
|
Contributed by Richard Henderson <rth@redhat.com>.
|
|
|
|
This file is part of the GNU OpenMP Library (libgomp).
|
|
|
|
Libgomp is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or
|
|
(at your option) any later version.
|
|
|
|
Libgomp 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 Lesser General Public License for
|
|
more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with libgomp; see the file COPYING.LIB. If not, write to the
|
|
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
|
|
MA 02110-1301, USA. */
|
|
|
|
/* As a special exception, if you link this library with other files, some
|
|
of which are compiled with GCC, to produce an executable, this library
|
|
does not by itself cause the resulting executable to be covered by the
|
|
GNU General Public License. This exception does not however invalidate
|
|
any other reasons why the executable file might be covered by the GNU
|
|
General Public License. */
|
|
|
|
/* This is the default POSIX 1003.1b implementation of a semaphore
|
|
synchronization mechanism for libgomp. This type is private to
|
|
the library.
|
|
|
|
This is a bit heavy weight for what we need, in that we're not
|
|
interested in sem_wait as a cancelation point, but it's not too
|
|
bad for a default. */
|
|
|
|
#include "libgomp.h"
|
|
|
|
#ifdef HAVE_BROKEN_POSIX_SEMAPHORES
|
|
#include <stdlib.h>
|
|
|
|
void gomp_sem_init (gomp_sem_t *sem, int value)
|
|
{
|
|
int ret;
|
|
|
|
ret = pthread_mutex_init (&sem->mutex, NULL);
|
|
if (ret)
|
|
return;
|
|
|
|
ret = pthread_cond_init (&sem->cond, NULL);
|
|
if (ret)
|
|
return;
|
|
|
|
sem->value = value;
|
|
}
|
|
|
|
void gomp_sem_wait (gomp_sem_t *sem)
|
|
{
|
|
int ret;
|
|
|
|
ret = pthread_mutex_lock (&sem->mutex);
|
|
if (ret)
|
|
return;
|
|
|
|
if (sem->value > 0)
|
|
{
|
|
sem->value--;
|
|
ret = pthread_mutex_unlock (&sem->mutex);
|
|
return;
|
|
}
|
|
|
|
while (sem->value <= 0)
|
|
{
|
|
ret = pthread_cond_wait (&sem->cond, &sem->mutex);
|
|
if (ret)
|
|
{
|
|
pthread_mutex_unlock (&sem->mutex);
|
|
return;
|
|
}
|
|
}
|
|
|
|
sem->value--;
|
|
ret = pthread_mutex_unlock (&sem->mutex);
|
|
return;
|
|
}
|
|
|
|
void gomp_sem_post (gomp_sem_t *sem)
|
|
{
|
|
int ret;
|
|
|
|
ret = pthread_mutex_lock (&sem->mutex);
|
|
if (ret)
|
|
return;
|
|
|
|
sem->value++;
|
|
|
|
ret = pthread_mutex_unlock (&sem->mutex);
|
|
if (ret)
|
|
return;
|
|
|
|
ret = pthread_cond_signal (&sem->cond);
|
|
|
|
return;
|
|
}
|
|
|
|
void gomp_sem_destroy (gomp_sem_t *sem)
|
|
{
|
|
int ret;
|
|
|
|
ret = pthread_mutex_destroy (&sem->mutex);
|
|
if (ret)
|
|
return;
|
|
|
|
ret = pthread_cond_destroy (&sem->cond);
|
|
|
|
return;
|
|
}
|
|
#else /* HAVE_BROKEN_POSIX_SEMAPHORES */
|
|
void
|
|
gomp_sem_wait (gomp_sem_t *sem)
|
|
{
|
|
/* With POSIX, the wait can be canceled by signals. We don't want that.
|
|
It is expected that the return value here is -1 and errno is EINTR. */
|
|
while (sem_wait (sem) != 0)
|
|
continue;
|
|
}
|
|
#endif
|