1*53ee8cc1Swenshuai.xi /* Copyright (C) 2002, 2003 Free Software Foundation, Inc. 2*53ee8cc1Swenshuai.xi This file is part of the GNU C Library. 3*53ee8cc1Swenshuai.xi 4*53ee8cc1Swenshuai.xi The GNU C Library is free software; you can redistribute it and/or 5*53ee8cc1Swenshuai.xi modify it under the terms of the GNU Lesser General Public 6*53ee8cc1Swenshuai.xi License as published by the Free Software Foundation; either 7*53ee8cc1Swenshuai.xi version 2.1 of the License, or (at your option) any later version. 8*53ee8cc1Swenshuai.xi 9*53ee8cc1Swenshuai.xi The GNU C Library is distributed in the hope that it will be useful, 10*53ee8cc1Swenshuai.xi but WITHOUT ANY WARRANTY; without even the implied warranty of 11*53ee8cc1Swenshuai.xi MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12*53ee8cc1Swenshuai.xi Lesser General Public License for more details. 13*53ee8cc1Swenshuai.xi 14*53ee8cc1Swenshuai.xi You should have received a copy of the GNU Lesser General Public 15*53ee8cc1Swenshuai.xi License along with the GNU C Library; if not, write to the Free 16*53ee8cc1Swenshuai.xi Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 17*53ee8cc1Swenshuai.xi 02111-1307 USA. */ 18*53ee8cc1Swenshuai.xi 19*53ee8cc1Swenshuai.xi #ifndef _SEMAPHORE_H 20*53ee8cc1Swenshuai.xi #define _SEMAPHORE_H 1 21*53ee8cc1Swenshuai.xi 22*53ee8cc1Swenshuai.xi #include <features.h> 23*53ee8cc1Swenshuai.xi #include <sys/types.h> 24*53ee8cc1Swenshuai.xi #ifdef __USE_XOPEN2K 25*53ee8cc1Swenshuai.xi # define __need_timespec 26*53ee8cc1Swenshuai.xi # include <time.h> 27*53ee8cc1Swenshuai.xi #endif 28*53ee8cc1Swenshuai.xi 29*53ee8cc1Swenshuai.xi /* Get the definition for sem_t. */ 30*53ee8cc1Swenshuai.xi #include <bits/semaphore.h> 31*53ee8cc1Swenshuai.xi 32*53ee8cc1Swenshuai.xi 33*53ee8cc1Swenshuai.xi __BEGIN_DECLS 34*53ee8cc1Swenshuai.xi 35*53ee8cc1Swenshuai.xi /* Initialize semaphore object SEM to VALUE. If PSHARED then share it 36*53ee8cc1Swenshuai.xi with other processes. */ 37*53ee8cc1Swenshuai.xi extern int sem_init (sem_t *__sem, int __pshared, unsigned int __value) 38*53ee8cc1Swenshuai.xi __THROW; 39*53ee8cc1Swenshuai.xi /* Free resources associated with semaphore object SEM. */ 40*53ee8cc1Swenshuai.xi extern int sem_destroy (sem_t *__sem) __THROW; 41*53ee8cc1Swenshuai.xi 42*53ee8cc1Swenshuai.xi /* Open a named semaphore NAME with open flags OFLAG. */ 43*53ee8cc1Swenshuai.xi extern sem_t *sem_open (__const char *__name, int __oflag, ...) __THROW; 44*53ee8cc1Swenshuai.xi 45*53ee8cc1Swenshuai.xi /* Close descriptor for named semaphore SEM. */ 46*53ee8cc1Swenshuai.xi extern int sem_close (sem_t *__sem) __THROW; 47*53ee8cc1Swenshuai.xi 48*53ee8cc1Swenshuai.xi /* Remove named semaphore NAME. */ 49*53ee8cc1Swenshuai.xi extern int sem_unlink (__const char *__name) __THROW; 50*53ee8cc1Swenshuai.xi 51*53ee8cc1Swenshuai.xi /* Wait for SEM being posted. 52*53ee8cc1Swenshuai.xi 53*53ee8cc1Swenshuai.xi This function is a cancellation point and therefore not marked with 54*53ee8cc1Swenshuai.xi __THROW. */ 55*53ee8cc1Swenshuai.xi extern int sem_wait (sem_t *__sem); 56*53ee8cc1Swenshuai.xi 57*53ee8cc1Swenshuai.xi #ifdef __USE_XOPEN2K 58*53ee8cc1Swenshuai.xi /* Similar to `sem_wait' but wait only until ABSTIME. 59*53ee8cc1Swenshuai.xi 60*53ee8cc1Swenshuai.xi This function is a cancellation point and therefore not marked with 61*53ee8cc1Swenshuai.xi __THROW. */ 62*53ee8cc1Swenshuai.xi extern int sem_timedwait (sem_t *__restrict __sem, 63*53ee8cc1Swenshuai.xi __const struct timespec *__restrict __abstime); 64*53ee8cc1Swenshuai.xi #endif 65*53ee8cc1Swenshuai.xi 66*53ee8cc1Swenshuai.xi /* Test whether SEM is posted. */ 67*53ee8cc1Swenshuai.xi extern int sem_trywait (sem_t *__sem) __THROW; 68*53ee8cc1Swenshuai.xi 69*53ee8cc1Swenshuai.xi /* Post SEM. */ 70*53ee8cc1Swenshuai.xi extern int sem_post (sem_t *__sem) __THROW; 71*53ee8cc1Swenshuai.xi 72*53ee8cc1Swenshuai.xi /* Get current value of SEM and store it in *SVAL. */ 73*53ee8cc1Swenshuai.xi extern int sem_getvalue (sem_t *__restrict __sem, int *__restrict __sval) 74*53ee8cc1Swenshuai.xi __THROW; 75*53ee8cc1Swenshuai.xi 76*53ee8cc1Swenshuai.xi 77*53ee8cc1Swenshuai.xi __END_DECLS 78*53ee8cc1Swenshuai.xi 79*53ee8cc1Swenshuai.xi #endif /* semaphore.h */ 80