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/*

 *  mutexunlock.c,v 1.3 2001/01/24 14:17:28 joel Exp

 */

#if HAVE_CONFIG_H

#include "config.h"

#endif

#include <assert.h>

#include <errno.h>

#include <pthread.h>

#include <rtems/system.h>

#include <rtems/score/coremutex.h>

#include <rtems/score/watchdog.h>

#if defined(RTEMS_MULTIPROCESSING)

#include <rtems/score/mpci.h>

#endif

#include <rtems/posix/mutex.h>

#include <rtems/posix/priority.h>

#include <rtems/posix/time.h>

/*PAGE

 *

 *  11.3.3 Locking and Unlocking a Mutex, P1003.1c/Draft 10, p. 93

 *

 *  NOTE: P1003.4b/D8 adds pthread_mutex_timedlock(), p. 29

 */

int pthread_mutex_unlock(

  pthread_mutex_t           *mutex

)

{

  register POSIX_Mutex_Control *the_mutex;

  Objects_Locations             location;

  CORE_mutex_Status             status;

  the_mutex = _POSIX_Mutex_Get( mutex, &location );

  switch ( location ) {

    case OBJECTS_REMOTE:

#if defined(RTEMS_MULTIPROCESSING)

      return _POSIX_Mutex_MP_Send_request_packet(

          POSIX_MUTEX_MP_RELEASE_REQUEST,

          *mutex,

          0,                    /* Not used */

          MPCI_DEFAULT_TIMEOUT

      );

#endif

    case OBJECTS_ERROR:

      return EINVAL;

    case OBJECTS_LOCAL:

      status = _CORE_mutex_Surrender(

        &the_mutex->Mutex,

        the_mutex->Object.id,

#if defined(RTEMS_MULTIPROCESSING)

        _POSIX_Threads_mutex_MP_support

#else

        NULL

#endif

      );

      _Thread_Enable_dispatch();

      return _POSIX_Mutex_From_core_mutex_status( status );

      break;

  }

  return POSIX_BOTTOM_REACHED();

}