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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 */