path: root/cpukit/posix/src/condsignalsupp.c

/**
 * @file
 *
 * @brief Implements wake up version of the "signal" operation
 * @ingroup POSIX_COND_VARS Condition Variables
 */

/*
 *  COPYRIGHT (c) 1989-2007.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.rtems.com/license/LICENSE.
 */

#if HAVE_CONFIG_H
#include "config.h"
#endif

#include <pthread.h>
#include <errno.h>

#include <rtems/system.h>
#include <rtems/score/object.h>
#include <rtems/score/states.h>
#include <rtems/score/watchdog.h>
#include <rtems/posix/condimpl.h>
#include <rtems/posix/time.h>
#include <rtems/posix/muteximpl.h>

/*
 *  _POSIX_Condition_variables_Signal_support
 *
 *  A support routine which implements guts of the broadcast and single task
 *  wake up version of the "signal" operation.
 */

int _POSIX_Condition_variables_Signal_support(
  pthread_cond_t            *cond,
  bool                       is_broadcast
)
{
  register POSIX_Condition_variables_Control *the_cond;
  Objects_Locations                           location;
  Thread_Control                             *the_thread;

  the_cond = _POSIX_Condition_variables_Get( cond, &location );
  switch ( location ) {

    case OBJECTS_LOCAL:
      do {
        the_thread = _Thread_queue_Dequeue( &the_cond->Wait_queue );
        if ( !the_thread )
          the_cond->Mutex = POSIX_CONDITION_VARIABLES_NO_MUTEX;
      } while ( is_broadcast && the_thread );

      _Objects_Put( &the_cond->Object );

      return 0;

#if defined(RTEMS_MULTIPROCESSING)
    case OBJECTS_REMOTE:
#endif
    case OBJECTS_ERROR:
      break;
  }

  return EINVAL;
}