/*
* 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.
*
* $Id$
*/
#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;
void *handler;
#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;
handler = NULL;
#if defined(RTEMS_MULTIPROCESSING)
handler = _Message_queue_MP_Send_extract_proxy;
#endif
if ( ! _CORE_message_queue_Initialize(
&the_message_queue->message_queue,
OBJECTS_RTEMS_MESSAGE_QUEUES,
&the_msgq_attributes,
count,
max_message_size,
handler ) ) {
#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,
0
);
#endif
_Thread_Enable_dispatch();
return RTEMS_SUCCESSFUL;
}
