/* Copyright (C) 2002-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _SEMAPHORE_H
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#define _SEMAPHORE_H 1
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#include <features.h>
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#include <sys/types.h>
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#ifdef __USE_XOPEN2K
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# include <bits/types/struct_timespec.h>
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#endif
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/* Get the definition for sem_t. */
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#include <bits/semaphore.h>
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__BEGIN_DECLS
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/* Initialize semaphore object SEM to VALUE. If PSHARED then share it
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with other processes. */
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extern int sem_init (sem_t *__sem, int __pshared, unsigned int __value)
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__THROW __nonnull ((1));
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/* Free resources associated with semaphore object SEM. */
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extern int sem_destroy (sem_t *__sem) __THROW __nonnull ((1));
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/* Open a named semaphore NAME with open flags OFLAG. */
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extern sem_t *sem_open (const char *__name, int __oflag, ...)
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__THROW __nonnull ((1));
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/* Close descriptor for named semaphore SEM. */
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extern int sem_close (sem_t *__sem) __THROW __nonnull ((1));
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/* Remove named semaphore NAME. */
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extern int sem_unlink (const char *__name) __THROW __nonnull ((1));
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/* Wait for SEM being posted.
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This function is a cancellation point and therefore not marked with
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__THROW. */
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extern int sem_wait (sem_t *__sem) __nonnull ((1));
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#ifdef __USE_XOPEN2K
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/* Similar to `sem_wait' but wait only until ABSTIME.
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This function is a cancellation point and therefore not marked with
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__THROW. */
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extern int sem_timedwait (sem_t *__restrict __sem,
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const struct timespec *__restrict __abstime)
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__nonnull ((1, 2));
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#endif
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#ifdef __USE_GNU
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extern int sem_clockwait (sem_t *__restrict __sem,
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clockid_t clock,
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const struct timespec *__restrict __abstime)
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__nonnull ((1, 3));
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#endif
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/* Test whether SEM is posted. */
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extern int sem_trywait (sem_t *__sem) __THROWNL __nonnull ((1));
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/* Post SEM. */
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extern int sem_post (sem_t *__sem) __THROWNL __nonnull ((1));
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/* Get current value of SEM and store it in *SVAL. */
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extern int sem_getvalue (sem_t *__restrict __sem, int *__restrict __sval)
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__THROW __nonnull ((1, 2));
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__END_DECLS
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#endif /* semaphore.h */
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