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sem.h
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/* Copyright (C) 1995-2018 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 Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #ifndef _SYS_SEM_H #define _SYS_SEM_H 1 #include <features.h> #define __need_size_t #include <stddef.h> /* Get common definition of System V style IPC. */ #include <sys/ipc.h> /* Get system dependent definition of `struct semid_ds' and more. */ #include <bits/sem.h> #ifdef __USE_GNU # include <bits/types/struct_timespec.h> #endif /* The following System V style IPC functions implement a semaphore handling. The definition is found in XPG2. */ /* Structure used for argument to `semop' to describe operations. */ struct sembuf { unsigned short int sem_num; /* semaphore number */ short int sem_op; /* semaphore operation */ short int sem_flg; /* operation flag */ }; __BEGIN_DECLS /* Semaphore control operation. */ extern int semctl (int __semid, int __semnum, int __cmd, ...) __THROW; /* Get semaphore. */ extern int semget (key_t __key, int __nsems, int __semflg) __THROW; /* Operate on semaphore. */ extern int semop (int __semid, struct sembuf *__sops, size_t __nsops) __THROW; #ifdef __USE_GNU /* Operate on semaphore with timeout. */ extern int semtimedop (int __semid, struct sembuf *__sops, size_t __nsops, const struct timespec *__timeout) __THROW; #endif __END_DECLS #endif /* sys/sem.h */