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tasks/libposix/include/posix/sys/sem.h

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+/* Copyright (C) 1995-1999, 2000 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#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>
+
+/* 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;
+
+__END_DECLS
+
+#endif /* sys/sem.h */