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/* Copyright (C) 1995, 1996, 1997, 1998 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifdef HAVE_CYGWIN
#ifndef _SYS_SEM_H
#define _SYS_SEM_H 1
typedef long __key_t;
typedef long __time_t;
#include <features.h>
#include <sys/types.h>
/* Get common definition of System V style IPC. */
#include <apc_winipc.h>
/* Get system dependent definition of `struct semid_ds' and more. */
/* #include <bits/sem.h> */
/* Flags for `semop'. */
#define SEM_UNDO 0x1000 /* undo the operation on exit */
/* Commands for `semctl'. */
#define GETPID 11 /* get sempid */
#define GETVAL 12 /* get semval */
#define GETALL 13 /* get all semval's */
#define GETNCNT 14 /* get semncnt */
#define GETZCNT 15 /* get semzcnt */
#define SETVAL 16 /* set semval */
#define SETALL 17 /* set all semval's */
/* Data structure describing a set of semaphores. */
struct semid_ds
{
struct ipc_perm sem_perm; /* operation permission struct */
__time_t sem_otime; /* last semop() time */
__time_t sem_ctime; /* last time changed by semctl() */
struct sem *__sembase; /* ptr to first semaphore in array */
struct sem_queue *__sem_pending; /* pending operations */
struct sem_queue *__sem_pending_last; /* last pending operation */
struct sem_undo *__undo; /* ondo requests on this array */
unsigned short int sem_nsems; /* number of semaphores in set */
};
/* The user should define a union like the following to use it for arguments
for `semctl'. */
union semun
{
int val; /* <= value for SETVAL */
struct semid_ds *buf; /* <= buffer for IPC_STAT & IPC_SET */
unsigned short int *array; /* <= array for GETALL & SETALL */
struct seminfo *__buf; /* <= buffer for IPC_INFO */
};
/* 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
{
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 __P ((int __semid, int __semnum, int __cmd, ...));
/* Get semaphore. */
extern int semget __P ((key_t __key, int __nsems, int __semflg));
/* Operate on semaphore. */
extern int semop __P ((int __semid, struct sembuf *__sops,
unsigned int __nsops));
__END_DECLS
#endif /* sys/sem.h */
#endif /* HAVE_CYGWIN */
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