1 /* Copyright (C) 1995-1999, 2000, 2003 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, see 16 <http://www.gnu.org/licenses/>. */ 17 18 #ifndef _SYS_SEM_H 19 #define _SYS_SEM_H 1 20 21 #include <features.h> 22 23 #define __need_size_t 24 #include <stddef.h> 25 26 /* Get common definition of System V style IPC. */ 27 #include <sys/ipc.h> 28 29 /* Get system dependent definition of `struct semid_ds' and more. */ 30 #include <bits/sem.h> 31 32 #ifdef __USE_GNU 33 # define __need_timespec 34 # include <time.h> 35 #endif 36 37 /* The following System V style IPC functions implement a semaphore 38 handling. The definition is found in XPG2. */ 39 40 /* Structure used for argument to `semop' to describe operations. */ 41 struct sembuf 42 { 43 unsigned short int sem_num; /* semaphore number */ 44 short int sem_op; /* semaphore operation */ 45 short int sem_flg; /* operation flag */ 46 }; 47 48 49 __BEGIN_DECLS 50 51 /* Semaphore control operation. */ 52 extern int semctl (int __semid, int __semnum, int __cmd, ...) __THROW; 53 54 /* Get semaphore. */ 55 extern int semget (key_t __key, int __nsems, int __semflg) __THROW; 56 57 /* Operate on semaphore. */ 58 extern int semop (int __semid, struct sembuf *__sops, size_t __nsops) __THROW; 59 60 #ifdef __USE_GNU 61 /* Operate on semaphore with timeout. */ 62 extern int semtimedop (int __semid, struct sembuf *__sops, size_t __nsops, 63 const struct timespec *__timeout) __THROW; 64 #endif 65 66 __END_DECLS 67 68 #endif /* sys/sem.h */ 69