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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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* coremsginsert.c,v 1.1 2000/01/13 18:32:09 jennifer 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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