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/*

 *  mutexsetprioceiling.c,v 1.4 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

 *

 *  13.6.2 Change the Priority Ceiling of a Mutex, P1003.1c/Draft 10, p. 131

 */

int pthread_mutex_setprioceiling(

  pthread_mutex_t   *mutex,

  int                prioceiling,

  int               *old_ceiling

)

{

  register POSIX_Mutex_Control *the_mutex;

  Objects_Locations             location;

  Priority_Control              the_priority;

  int                           status;

  if ( !old_ceiling )

    return EINVAL;

  if ( !_POSIX_Priority_Is_valid( prioceiling ) )

    return EINVAL;

  the_priority = _POSIX_Priority_To_core( prioceiling );

  /*

   *  Must acquire the mutex before we can change it's ceiling

   */

  status = pthread_mutex_lock( mutex );

  if ( status )

    return status;

  the_mutex = _POSIX_Mutex_Get( mutex, &location );

  switch ( location ) {

    case OBJECTS_REMOTE:

#if defined(RTEMS_MULTIPROCESSING)

      /*  XXX It feels questionable to set the ceiling on a remote mutex. */

      return EINVAL;

#endif

    case OBJECTS_ERROR:

      return EINVAL;        /* impossible to get here */

    case OBJECTS_LOCAL:

      *old_ceiling = _POSIX_Priority_From_core(

        the_mutex->Mutex.Attributes.priority_ceiling

      );

      the_mutex->Mutex.Attributes.priority_ceiling = the_priority;

      _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 0;

  }

  return POSIX_BOTTOM_REACHED();

}