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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.

 *

 *  msgqcreate.c,v 1.4 2002/07/01 22:32:31 joel 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_create

 *

 *  This directive creates a message queue by allocating and initializing

 *  a message queue data structure.

 *

 *  Input parameters:

 *    name             - user defined queue name

 *    count            - maximum message and reserved buffer count

 *    max_message_size - maximum size of each message

 *    attribute_set    - process method

 *    id               - pointer to queue

 *

 *  Output parameters:

 *    id                - queue id

 *    RTEMS_SUCCESSFUL  - if successful

 *    error code        - if unsuccessful

 */

rtems_status_code rtems_message_queue_create(

  rtems_name          name,

  unsigned32          count,

  unsigned32          max_message_size,

  rtems_attribute     attribute_set,

  Objects_Id         *id

)

{

  register Message_queue_Control *the_message_queue;

  CORE_message_queue_Attributes   the_msgq_attributes;

#if defined(RTEMS_MULTIPROCESSING)

  boolean                         is_global;

#endif

  if ( !rtems_is_name_valid( name ) )

    return RTEMS_INVALID_NAME;

#if defined(RTEMS_MULTIPROCESSING)

  if ( (is_global = _Attributes_Is_global( attribute_set ) ) &&

       !_System_state_Is_multiprocessing )

    return RTEMS_MP_NOT_CONFIGURED;

#endif

  if ( count == 0 )

      return RTEMS_INVALID_NUMBER;

  if ( max_message_size == 0 )

      return RTEMS_INVALID_SIZE;

#if defined(RTEMS_MULTIPROCESSING)

#if 1

  /*

   * I am not 100% sure this should be an error.

   * It seems reasonable to create a que with a large max size,

   * and then just send smaller msgs from remote (or all) nodes.

   */

  if ( is_global && (_MPCI_table->maximum_packet_size < max_message_size) )

    return RTEMS_INVALID_SIZE;

#endif

#endif

  _Thread_Disable_dispatch();              /* protects object pointer */

  the_message_queue = _Message_queue_Allocate( count, max_message_size );

  if ( !the_message_queue ) {

    _Thread_Enable_dispatch();

    return RTEMS_TOO_MANY;

  }

#if defined(RTEMS_MULTIPROCESSING)

  if ( is_global &&

    !( _Objects_MP_Allocate_and_open( &_Message_queue_Information,

                              name, the_message_queue->Object.id, FALSE ) ) ) {

    _Message_queue_Free( the_message_queue );

    _Thread_Enable_dispatch();

    return RTEMS_TOO_MANY;

  }

#endif

  the_message_queue->attribute_set = attribute_set;

  if (_Attributes_Is_priority( attribute_set ) )

    the_msgq_attributes.discipline = CORE_MESSAGE_QUEUE_DISCIPLINES_PRIORITY;

  else

    the_msgq_attributes.discipline = CORE_MESSAGE_QUEUE_DISCIPLINES_FIFO;

  if ( ! _CORE_message_queue_Initialize(

           &the_message_queue->message_queue,

           &the_msgq_attributes,

           count,

           max_message_size

         ) ) {

#if defined(RTEMS_MULTIPROCESSING)

    if ( is_global )

        _Objects_MP_Close(

          &_Message_queue_Information, the_message_queue->Object.id);

#endif

    _Message_queue_Free( the_message_queue );

    _Thread_Enable_dispatch();

    return RTEMS_TOO_MANY;

  }

  _Objects_Open(

    &_Message_queue_Information,

    &the_message_queue->Object,

    name

  );

  *id = the_message_queue->Object.id;

#if defined(RTEMS_MULTIPROCESSING)

  if ( is_global )

    _Message_queue_MP_Send_process_packet(

      MESSAGE_QUEUE_MP_ANNOUNCE_CREATE,

      the_message_queue->Object.id,

      name,

    );

#endif

  _Thread_Enable_dispatch();

  return RTEMS_SUCCESSFUL;

}