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/*
* Message Queue Manager
*
*
* COPYRIGHT (c) 1989-1998.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* 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.
*
* $Id$
*/
#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_get_number_pending
*
* This directive returns the number of messages pending.
*
* 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_get_number_pending(
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_GET_NUMBER_PENDING_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 = the_message_queue->message_queue.number_of_pending_messages;
_Thread_Enable_dispatch();
return RTEMS_SUCCESSFUL;
}
return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */
}
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