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/*

 *  Message Queue Manager

 *

 *

 *  COPYRIGHT (c) 1989-1999.

 *  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.OARcorp.com/rtems/license.html.

 *

 *  $Id: msgqflush.c,v 1.2 2001-09-27 11:59:19 chris Exp $

 */

#include <rtems/system.h>

#include <rtems/score/sysstate.h>

#include <rtems/score/chain.h>

#include <rtems/score/isr.h>

#include <rtems/score/coremsg.h>

#include <rtems/score/object.h>

#include <rtems/score/states.h>

#include <rtems/score/thread.h>

#include <rtems/score/wkspace.h>

#if defined(RTEMS_MULTIPROCESSING)

#include <rtems/score/mpci.h>

#endif

#include <rtems/rtems/status.h>

#include <rtems/rtems/attr.h>

#include <rtems/rtems/message.h>

#include <rtems/rtems/options.h>

#include <rtems/rtems/support.h>

/*PAGE

 *

 *  rtems_message_queue_flush

 *

 *  This directive removes all pending messages from a queue and returns

 *  the number of messages removed.  If no messages were present then

 *  a count of zero is returned.

 *

 *  Input parameters:

 *    id    - queue id

 *    count - return area for count

 *

 *  Output parameters:

 *    count             - number of messages removed ( 0 = empty queue )

 *    RTEMS_SUCCESSFUL - if successful

 *    error code        - if unsuccessful

 */

rtems_status_code rtems_message_queue_flush(

  Objects_Id  id,

  unsigned32 *count

)

{

  register Message_queue_Control *the_message_queue;

  Objects_Locations               location;

  the_message_queue = _Message_queue_Get( id, &location );

  switch ( location ) {

    case OBJECTS_REMOTE:

#if defined(RTEMS_MULTIPROCESSING)

      _Thread_Executing->Wait.return_argument = count;

      return

        _Message_queue_MP_Send_request_packet(

          MESSAGE_QUEUE_MP_FLUSH_REQUEST,

          id,

          0,                               /* buffer not used */

          0,                               /* size */

          0,                               /* option_set not used */

          MPCI_DEFAULT_TIMEOUT

        );

#endif

    case OBJECTS_ERROR:

      return RTEMS_INVALID_ID;

    case OBJECTS_LOCAL:

      *count = _CORE_message_queue_Flush( &the_message_queue->message_queue );

      _Thread_Enable_dispatch();

      return RTEMS_SUCCESSFUL;

  }

  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */

}