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/*  semaphore.h
 *
 *  $Id: semaphore.h,v 1.2 2001-09-27 11:59:13 chris Exp $
 */
 
#ifndef __POSIX_SEMAPHORE_h
#define __POSIX_SEMAPHORE_h
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <sys/features.h>
 
#if defined(_POSIX_SEMAPHORES)
 
#include <sys/time.h>
 
/*
 *  11.1 Semaphore Characteristics, P1003.1b-1993, p.219
 */
 
typedef int sem_t;
 
/*
 *  11.2.1 Initialize an Unnamed Semaphore, P1003.1b-1993, p.219
 */
 
int sem_init(
  sem_t         *sem,
  int            pshared,
  unsigned int   value
);
 
/*
 *  11.2.2 Destroy an Unnamed Semaphore, P1003.1b-1993, p.220
 */
 
int sem_destroy(
  sem_t *sem
);
 
/*
 *  11.2.3 Initialize/Open a Named Semaphore, P1003.1b-1993, p.221
 *
 *  NOTE: Follows open() calling conventions.
 */
 
sem_t *sem_open(
  const char *name,
  int         oflag,
  ...
);
 
/*
 *  11.2.4 Close a Named Semaphore, P1003.1b-1993, p.224
 */
 
int sem_close(
  sem_t *sem
);
 
/*
 *  11.2.5 Remove a Named Semaphore, P1003.1b-1993, p.225
 */
 
int sem_unlink(
  const char *name
);
 
/*
 *  11.2.6 Lock a Semaphore, P1003.1b-1993, p.226
 *
 *  NOTE: P1003.4b/D8 adds sem_timedwait(), p. 27
 */
 
int sem_wait(
  sem_t *sem
);
 
int sem_trywait(
  sem_t *sem
);
 
#if defined(_POSIX_TIMEOUTS)
int sem_timedwait(
  sem_t                 *sem,
  const struct timespec *timeout
);
#endif
 
/*
 *  11.2.7 Unlock a Semaphore, P1003.1b-1993, p.227
 */
 
int sem_post(
  sem_t  *sem
);
 
/*
 *  11.2.8 Get the Value of a Semaphore, P1003.1b-1993, p.229
 */
 
int sem_getvalue(
  sem_t  *sem,
  int    *sval
);
 
#endif   /* _POSIX_SEMAPHORES */
 
#ifdef __cplusplus
}
#endif
 
#endif
/* end of include file */