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/* Copyright (C) 2002-2020 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library 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. 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ #ifndef _SEMAPHORE_H #define _SEMAPHORE_H 1 #include <features.h> #include <sys/types.h> #ifdef __USE_XOPEN2K # include <bits/types/struct_timespec.h> #endif /* Get the definition for sem_t. */ #include <bits/semaphore.h> __BEGIN_DECLS /* Initialize semaphore object SEM to VALUE. If PSHARED then share it with other processes. */ extern int sem_init (sem_t *__sem, int __pshared, unsigned int __value) __THROW __nonnull ((1)); /* Free resources associated with semaphore object SEM. */ extern int sem_destroy (sem_t *__sem) __THROW __nonnull ((1)); /* Open a named semaphore NAME with open flags OFLAG. */ extern sem_t *sem_open (const char *__name, int __oflag, ...) __THROW __nonnull ((1)); /* Close descriptor for named semaphore SEM. */ extern int sem_close (sem_t *__sem) __THROW __nonnull ((1)); /* Remove named semaphore NAME. */ extern int sem_unlink (const char *__name) __THROW __nonnull ((1)); /* Wait for SEM being posted. This function is a cancellation point and therefore not marked with __THROW. */ extern int sem_wait (sem_t *__sem) __nonnull ((1)); #ifdef __USE_XOPEN2K /* Similar to `sem_wait' but wait only until ABSTIME. This function is a cancellation point and therefore not marked with __THROW. */ extern int sem_timedwait (sem_t *__restrict __sem, const struct timespec *__restrict __abstime) __nonnull ((1, 2)); #endif #ifdef __USE_GNU extern int sem_clockwait (sem_t *__restrict __sem, clockid_t clock, const struct timespec *__restrict __abstime) __nonnull ((1, 3)); #endif /* Test whether SEM is posted. */ extern int sem_trywait (sem_t *__sem) __THROWNL __nonnull ((1)); /* Post SEM. */ extern int sem_post (sem_t *__sem) __THROWNL __nonnull ((1)); /* Get current value of SEM and store it in *SVAL. */ extern int sem_getvalue (sem_t *__restrict __sem, int *__restrict __sval) __THROW __nonnull ((1, 2)); __END_DECLS #endif /* semaphore.h */