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glibc  2.9
sem.h
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00001 /* Copyright (C) 1995-1999, 2000, 2003 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #ifndef _SYS_SEM_H
00020 #define _SYS_SEM_H   1
00021 
00022 #include <features.h>
00023 
00024 #define __need_size_t
00025 #include <stddef.h>
00026 
00027 /* Get common definition of System V style IPC.  */
00028 #include <sys/ipc.h>
00029 
00030 /* Get system dependent definition of `struct semid_ds' and more.  */
00031 #include <bits/sem.h>
00032 
00033 #ifdef __USE_GNU
00034 # define __need_timespec
00035 # include <time.h>
00036 #endif
00037 
00038 /* The following System V style IPC functions implement a semaphore
00039    handling.  The definition is found in XPG2.  */
00040 
00041 /* Structure used for argument to `semop' to describe operations.  */
00042 struct sembuf
00043 {
00044   unsigned short int sem_num;      /* semaphore number */
00045   short int sem_op;         /* semaphore operation */
00046   short int sem_flg;        /* operation flag */
00047 };
00048 
00049 
00050 __BEGIN_DECLS
00051 
00052 /* Semaphore control operation.  */
00053 extern int semctl (int __semid, int __semnum, int __cmd, ...) __THROW;
00054 
00055 /* Get semaphore.  */
00056 extern int semget (key_t __key, int __nsems, int __semflg) __THROW;
00057 
00058 /* Operate on semaphore.  */
00059 extern int semop (int __semid, struct sembuf *__sops, size_t __nsops) __THROW;
00060 
00061 #ifdef __USE_GNU
00062 /* Operate on semaphore with timeout.  */
00063 extern int semtimedop (int __semid, struct sembuf *__sops, size_t __nsops,
00064                      __const struct timespec *__timeout) __THROW;
00065 #endif
00066 
00067 __END_DECLS
00068 
00069 #endif /* sys/sem.h */