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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [rtems/] [src/] [msgqflush.c] - Rev 751
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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 */ }
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