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/*
* CORE Message Queue Handler
*
* DESCRIPTION:
*
* This package is the implementation of the CORE Message Queue Handler.
* This core object provides task synchronization and communication functions
* via messages passed to queue objects.
*
* 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/chain.h>
#include <rtems/score/isr.h>
#include <rtems/score/object.h>
#include <rtems/score/coremsg.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
/*PAGE
*
* _CORE_message_queue_Flush_support
*
* This message handler routine removes all messages from a message queue
* and returns them to the inactive message pool. The number of messages
* flushed from the queue is returned
*
* Input parameters:
* the_message_queue - pointer to message queue
*
* Output parameters:
* returns - number of messages placed on inactive chain
*
* INTERRUPT LATENCY:
* only case
*/
unsigned32 _CORE_message_queue_Flush_support(
CORE_message_queue_Control *the_message_queue
)
{
ISR_Level level;
Chain_Node *inactive_first;
Chain_Node *message_queue_first;
Chain_Node *message_queue_last;
unsigned32 count;
_ISR_Disable( level );
inactive_first = the_message_queue->Inactive_messages.first;
message_queue_first = the_message_queue->Pending_messages.first;
message_queue_last = the_message_queue->Pending_messages.last;
the_message_queue->Inactive_messages.first = message_queue_first;
message_queue_last->next = inactive_first;
inactive_first->previous = message_queue_last;
message_queue_first->previous =
_Chain_Head( &the_message_queue->Inactive_messages );
_Chain_Initialize_empty( &the_message_queue->Pending_messages );
count = the_message_queue->number_of_pending_messages;
the_message_queue->number_of_pending_messages = 0;
_ISR_Enable( level );
return count;
}
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