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/**
* @file
*
* @brief RTEMS Message Queue Get Number Pending
* @ingroup ClassicMessageQueue Message Queues
*/
/*
* COPYRIGHT (c) 1989-2014.
* 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.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/rtems/messageimpl.h>
rtems_status_code rtems_message_queue_get_number_pending(
rtems_id id,
uint32_t *count
)
{
Message_queue_Control *the_message_queue;
Objects_Locations location;
ISR_lock_Context lock_context;
if ( !count )
return RTEMS_INVALID_ADDRESS;
the_message_queue = _Message_queue_Get_interrupt_disable(
id,
&location,
&lock_context
);
switch ( location ) {
case OBJECTS_LOCAL:
_CORE_message_queue_Acquire_critical(
&the_message_queue->message_queue,
&lock_context
);
*count = the_message_queue->message_queue.number_of_pending_messages;
_CORE_message_queue_Release(
&the_message_queue->message_queue,
&lock_context
);
return RTEMS_SUCCESSFUL;
#if defined(RTEMS_MULTIPROCESSING)
case OBJECTS_REMOTE:
_Thread_Get_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:
break;
}
return RTEMS_INVALID_ID;
}
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