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- /* Linuxthreads - a simple clone()-based implementation of Posix */
- /* threads for Linux. */
- /* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */
- /* */
- /* This program is free software; you can redistribute it and/or */
- /* modify it under the terms of the GNU Library General Public License */
- /* as published by the Free Software Foundation; either version 2 */
- /* of the License, or (at your option) any later version. */
- /* */
- /* This program 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 Library General Public License for more details. */
- #ifndef _SEMAPHORE_H
- #define _SEMAPHORE_H 1
- #include <features.h>
- #include <sys/types.h>
- #include <limits.h>
- #ifdef __USE_XOPEN2K
- # define __need_timespec
- # include <time.h>
- #endif
- #ifndef _PTHREAD_DESCR_DEFINED
- /* Thread descriptors. Needed for `sem_t' definition. */
- typedef struct _pthread_descr_struct *_pthread_descr;
- # define _PTHREAD_DESCR_DEFINED
- #endif
- /* System specific semaphore definition. */
- typedef struct
- {
- struct _pthread_fastlock __sem_lock;
- int __sem_value;
- _pthread_descr __sem_waiting;
- } sem_t;
- /* Value returned if `sem_open' failed. */
- #define SEM_FAILED ((sem_t *) 0)
- /* Maximum value the semaphore can have. */
- #ifndef SEM_VALUE_MAX
- #define SEM_VALUE_MAX ((int) ((~0u) >> 1))
- #endif
- __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;
- /* Free resources associated with semaphore object SEM. */
- extern int sem_destroy (sem_t *__sem) __THROW;
- /* Open a named semaphore NAME with open flags OFLAG. */
- extern sem_t *sem_open (const char *__name, int __oflag, ...) __THROW;
- /* Close descriptor for named semaphore SEM. */
- extern int sem_close (sem_t *__sem) __THROW;
- /* Remove named semaphore NAME. */
- extern int sem_unlink (const char *__name) __THROW;
- /* Wait for SEM being posted.
- This function is a cancellation point and therefore not marked with
- __THROW. */
- extern int sem_wait (sem_t *__sem);
- #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);
- #endif
- /* Test whether SEM is posted. */
- extern int sem_trywait (sem_t *__sem) __THROWNL;
- /* Post SEM. */
- extern int sem_post (sem_t *__sem) __THROWNL;
- /* Get current value of SEM and store it in *SVAL. */
- extern int sem_getvalue (sem_t *__restrict __sem, int *__restrict __sval)
- __THROW;
- __END_DECLS
- #endif /* semaphore.h */
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