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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [score/] [src/] [coremsginsert.c] - Blame information for rev 609

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/*
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 *  CORE Message Queue Handler
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 *
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 *  DESCRIPTION:
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 *
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 *  This package is the implementation of the CORE Message Queue Handler.
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 *  This core object provides task synchronization and communication functions
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 *  via messages passed to queue objects.
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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: coremsginsert.c,v 1.2 2001-09-27 11:59:34 chris Exp $
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 */
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#include <rtems/system.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/object.h>
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#include <rtems/score/coremsg.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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/*PAGE
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 *
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 *  _CORE_message_queue_Insert_message
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 *
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 *  This kernel routine inserts the specified message into the
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 *  message queue.  It is assumed that the message has been filled
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 *  in before this routine is called.
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 *
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 *  Input parameters:
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 *    the_message_queue - pointer to message queue
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 *    the_message       - message to insert
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 *    priority          - insert indication
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 *
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 *  Output parameters:  NONE
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 *
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 *  INTERRUPT LATENCY:
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 *    insert
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 */
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void _CORE_message_queue_Insert_message(
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  CORE_message_queue_Control        *the_message_queue,
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  CORE_message_queue_Buffer_control *the_message,
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  CORE_message_queue_Submit_types    submit_type
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)
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{
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  the_message_queue->number_of_pending_messages += 1;
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  the_message->priority = submit_type;
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  switch ( submit_type ) {
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    case CORE_MESSAGE_QUEUE_SEND_REQUEST:
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      _CORE_message_queue_Append( the_message_queue, the_message );
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      break;
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    case CORE_MESSAGE_QUEUE_URGENT_REQUEST:
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      _CORE_message_queue_Prepend( the_message_queue, the_message );
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      break;
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    default:
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      /* XXX interrupt critical section needs to be addressed */
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      {
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        CORE_message_queue_Buffer_control *this_message;
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        Chain_Node                        *the_node;
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        Chain_Control                     *the_header;
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        the_header = &the_message_queue->Pending_messages;
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        the_node = the_header->first;
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        while ( !_Chain_Is_tail( the_header, the_node ) ) {
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          this_message = (CORE_message_queue_Buffer_control *) the_node;
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          if ( this_message->priority <= the_message->priority ) {
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            the_node = the_node->next;
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            continue;
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          }
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          break;
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        }
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        _Chain_Insert( the_node->previous, &the_message->Node );
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      }
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      break;
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  }
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  /*
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   *  According to POSIX, does this happen before or after the message
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   *  is actually enqueued.  It is logical to think afterwards, because
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   *  the message is actually in the queue at this point.
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   */
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  if ( the_message_queue->number_of_pending_messages == 1 &&
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       the_message_queue->notify_handler )
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    (*the_message_queue->notify_handler)( the_message_queue->notify_argument );
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}

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