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/* Copyright (C) 2005-2022 Free Software Foundation, Inc.
Contributed by Richard Henderson <rth@redhat.com>.
This file is part of the GNU Offloading and Multi Processing Library
(libgomp).
Libgomp is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, 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 General Public License for
more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* 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. */
#ifndef GOMP_SEM_H
#define GOMP_SEM_H 1
#ifdef HAVE_ATTRIBUTE_VISIBILITY
# pragma GCC visibility push(default)
#endif
#include <semaphore.h>
#ifdef HAVE_ATTRIBUTE_VISIBILITY
# pragma GCC visibility pop
#endif
#ifdef HAVE_BROKEN_POSIX_SEMAPHORES
#include <pthread.h>
struct gomp_sem
{
pthread_mutex_t mutex;
pthread_cond_t cond;
int value;
};
typedef struct gomp_sem gomp_sem_t;
extern void gomp_sem_init (gomp_sem_t *sem, int value);
extern void gomp_sem_wait (gomp_sem_t *sem);
extern void gomp_sem_post (gomp_sem_t *sem);
extern void gomp_sem_destroy (gomp_sem_t *sem);
extern int gomp_sem_getcount (gomp_sem_t *sem);
#else /* HAVE_BROKEN_POSIX_SEMAPHORES */
typedef sem_t gomp_sem_t;
static inline void gomp_sem_init (gomp_sem_t *sem, int value)
{
sem_init (sem, 0, value);
}
extern void gomp_sem_wait (gomp_sem_t *sem);
static inline void gomp_sem_post (gomp_sem_t *sem)
{
sem_post (sem);
}
static inline void gomp_sem_destroy (gomp_sem_t *sem)
{
sem_destroy (sem);
}
static inline int gomp_sem_getcount (gomp_sem_t *sem)
{
int val;
if (sem_getvalue (sem, &val) < 0)
return -1;
return val;
}
#endif /* doesn't HAVE_BROKEN_POSIX_SEMAPHORES */
#endif /* GOMP_SEM_H */
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