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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [rtems/] [src/] [msgqflush.c] - Blame information for rev 30

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/*
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 *  Message Queue Manager
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 *
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 *
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 *  COPYRIGHT (c) 1989-1999.
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 *  On-Line Applications Research Corporation (OAR).
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 *
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 *  The license and distribution terms for this file may be
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 *  found in the file LICENSE in this distribution or at
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 *  http://www.OARcorp.com/rtems/license.html.
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 *
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 *  $Id: msgqflush.c,v 1.2 2001-09-27 11:59:19 chris Exp $
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 */
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#include <rtems/system.h>
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#include <rtems/score/sysstate.h>
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#include <rtems/score/chain.h>
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#include <rtems/score/isr.h>
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#include <rtems/score/coremsg.h>
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#include <rtems/score/object.h>
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#include <rtems/score/states.h>
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#include <rtems/score/thread.h>
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#include <rtems/score/wkspace.h>
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#if defined(RTEMS_MULTIPROCESSING)
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#include <rtems/score/mpci.h>
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#endif
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#include <rtems/rtems/status.h>
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#include <rtems/rtems/attr.h>
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#include <rtems/rtems/message.h>
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#include <rtems/rtems/options.h>
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#include <rtems/rtems/support.h>
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/*PAGE
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 *
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 *  rtems_message_queue_flush
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 *
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 *  This directive removes all pending messages from a queue and returns
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 *  the number of messages removed.  If no messages were present then
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 *  a count of zero is returned.
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 *
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 *  Input parameters:
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 *    id    - queue id
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 *    count - return area for count
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 *
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 *  Output parameters:
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 *    count             - number of messages removed ( 0 = empty queue )
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 *    RTEMS_SUCCESSFUL - if successful
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 *    error code        - if unsuccessful
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 */
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rtems_status_code rtems_message_queue_flush(
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  Objects_Id  id,
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  unsigned32 *count
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)
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{
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  register Message_queue_Control *the_message_queue;
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  Objects_Locations               location;
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  the_message_queue = _Message_queue_Get( id, &location );
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  switch ( location ) {
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    case OBJECTS_REMOTE:
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#if defined(RTEMS_MULTIPROCESSING)
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      _Thread_Executing->Wait.return_argument = count;
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      return
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        _Message_queue_MP_Send_request_packet(
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          MESSAGE_QUEUE_MP_FLUSH_REQUEST,
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          id,
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          0,                               /* buffer not used */
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          0,                               /* size */
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          0,                               /* option_set not used */
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          MPCI_DEFAULT_TIMEOUT
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        );
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#endif
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    case OBJECTS_ERROR:
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      return RTEMS_INVALID_ID;
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    case OBJECTS_LOCAL:
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      *count = _CORE_message_queue_Flush( &the_message_queue->message_queue );
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      _Thread_Enable_dispatch();
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      return RTEMS_SUCCESSFUL;
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  }
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  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */
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}

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