/* Copyright (C) 2002-2018 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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<http://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;

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/* Free resources associated with semaphore object SEM. */

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extern int sem_destroy (sem_t *__sem) __THROW;

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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, ...) __THROW;

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/* Close descriptor for named semaphore SEM. */

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extern int sem_close (sem_t *__sem) __THROW;

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/* Remove named semaphore NAME. */

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extern int sem_unlink (const char *__name) __THROW;

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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);

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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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#endif

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/* Test whether SEM is posted. */

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extern int sem_trywait (sem_t *__sem) __THROWNL;

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/* Post SEM. */

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extern int sem_post (sem_t *__sem) __THROWNL;

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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;

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__END_DECLS

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#endif /* semaphore.h */

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