/* Copyright (C) 2005 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 Library General Public License as published by the Free Software Foundation; either version 2 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifndef _SEMAPHORE_H #define _SEMAPHORE_H 1 #include __BEGIN_DECLS #include #define SEM_FAILED ((void *) 0) typedef struct __semaphore sem_t; /* Initialize semaphore *SEM with value VALUE. */ extern int sem_init (sem_t *sem, int pshared, unsigned value); /* Destroy semaphore *SEM created with sem_init. */ extern int sem_destroy (sem_t *sem); /* Store the value of semaphore *SEM in *VALUE. */ extern int sem_getvalue (sem_t *restrict sem, int *restrict value); /* Perform a down operation on semaphore *SEM. */ extern int sem_wait (sem_t *sem); /* Perform a down operation on semaphore *SEM if it can be done so without blocking. */ extern int sem_trywait (sem_t *sem); /* Perform a down operation on semaphore *SEM but don't wait longer than TIMEOUT. */ extern int sem_timedwait (sem_t *restrict sem, const struct timespec *restrict timeout); /* Perform an up operation on semaphore *SEM. */ extern int sem_post (sem_t *sem); /* Open a named semaphore. */ extern sem_t *sem_open (const char *name, int open_flags, ...); /* Close a semaphore returned by sem_open. */ extern int sem_close (sem_t *sem); /* Unlink a named semaphore. */ extern int sem_unlink (const char *name); __END_DECLS #endif /* semaphore.h */