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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: msgqcreate.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_create
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*
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* This directive creates a message queue by allocating and initializing
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* a message queue data structure.
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*
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* Input parameters:
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* name - user defined queue name
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* count - maximum message and reserved buffer count
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* max_message_size - maximum size of each message
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* attribute_set - process method
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* id - pointer to queue
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*
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* Output parameters:
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* id - queue id
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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_create(
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rtems_name name,
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unsigned32 count,
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unsigned32 max_message_size,
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rtems_attribute attribute_set,
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Objects_Id *id
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)
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{
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register Message_queue_Control *the_message_queue;
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CORE_message_queue_Attributes the_msgq_attributes;
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void *handler;
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#if defined(RTEMS_MULTIPROCESSING)
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boolean is_global;
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#endif
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if ( !rtems_is_name_valid( name ) )
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return RTEMS_INVALID_NAME;
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#if defined(RTEMS_MULTIPROCESSING)
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if ( (is_global = _Attributes_Is_global( attribute_set ) ) &&
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!_System_state_Is_multiprocessing )
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return RTEMS_MP_NOT_CONFIGURED;
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#endif
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if ( count == 0 )
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return RTEMS_INVALID_NUMBER;
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if ( max_message_size == 0 )
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return RTEMS_INVALID_SIZE;
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#if defined(RTEMS_MULTIPROCESSING)
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#if 1
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/*
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* I am not 100% sure this should be an error.
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* It seems reasonable to create a que with a large max size,
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* and then just send smaller msgs from remote (or all) nodes.
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*/
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if ( is_global && (_MPCI_table->maximum_packet_size < max_message_size) )
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return RTEMS_INVALID_SIZE;
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#endif
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#endif
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_Thread_Disable_dispatch(); /* protects object pointer */
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the_message_queue = _Message_queue_Allocate( count, max_message_size );
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if ( !the_message_queue ) {
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_Thread_Enable_dispatch();
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return RTEMS_TOO_MANY;
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}
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#if defined(RTEMS_MULTIPROCESSING)
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if ( is_global &&
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!( _Objects_MP_Allocate_and_open( &_Message_queue_Information,
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name, the_message_queue->Object.id, FALSE ) ) ) {
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_Message_queue_Free( the_message_queue );
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_Thread_Enable_dispatch();
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return RTEMS_TOO_MANY;
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}
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#endif
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the_message_queue->attribute_set = attribute_set;
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if (_Attributes_Is_priority( attribute_set ) )
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the_msgq_attributes.discipline = CORE_MESSAGE_QUEUE_DISCIPLINES_PRIORITY;
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else
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the_msgq_attributes.discipline = CORE_MESSAGE_QUEUE_DISCIPLINES_FIFO;
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handler = NULL;
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#if defined(RTEMS_MULTIPROCESSING)
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handler = _Message_queue_MP_Send_extract_proxy;
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#endif
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if ( ! _CORE_message_queue_Initialize(
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&the_message_queue->message_queue,
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OBJECTS_RTEMS_MESSAGE_QUEUES,
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&the_msgq_attributes,
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count,
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max_message_size,
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handler ) ) {
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#if defined(RTEMS_MULTIPROCESSING)
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if ( is_global )
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_Objects_MP_Close(
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&_Message_queue_Information, the_message_queue->Object.id);
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#endif
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_Message_queue_Free( the_message_queue );
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_Thread_Enable_dispatch();
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return RTEMS_TOO_MANY;
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}
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_Objects_Open(
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&_Message_queue_Information,
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&the_message_queue->Object,
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&name
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);
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*id = the_message_queue->Object.id;
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#if defined(RTEMS_MULTIPROCESSING)
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if ( is_global )
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_Message_queue_MP_Send_process_packet(
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MESSAGE_QUEUE_MP_ANNOUNCE_CREATE,
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the_message_queue->Object.id,
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name,
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);
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#endif
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_Thread_Enable_dispatch();
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return RTEMS_SUCCESSFUL;
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}
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