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/**
* @file
*
* @brief Initialize a Message Queue
* @ingroup RTEMSScoreMessageQueue
*/
/*
* COPYRIGHT (c) 1989-2009.
* 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.rtems.org/license/LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/coremsgimpl.h>
#include <rtems/score/assert.h>
#include <rtems/score/wkspace.h>
#define MESSAGE_SIZE_LIMIT \
( SIZE_MAX - sizeof( uintptr_t ) + 1 \
- sizeof( CORE_message_queue_Buffer_control ) )
bool _CORE_message_queue_Initialize(
CORE_message_queue_Control *the_message_queue,
CORE_message_queue_Disciplines discipline,
uint32_t maximum_pending_messages,
size_t maximum_message_size
)
{
size_t buffer_size;
the_message_queue->maximum_pending_messages = maximum_pending_messages;
the_message_queue->number_of_pending_messages = 0;
the_message_queue->maximum_message_size = maximum_message_size;
_CORE_message_queue_Set_notify( the_message_queue, NULL );
/* Make sure the message size computation does not overflow */
if ( maximum_message_size > MESSAGE_SIZE_LIMIT ) {
return false;
}
buffer_size = RTEMS_ALIGN_UP( maximum_message_size, sizeof( uintptr_t ) );
_Assert( buffer_size >= maximum_message_size );
buffer_size += sizeof( CORE_message_queue_Buffer_control );
_Assert( buffer_size >= sizeof( CORE_message_queue_Buffer_control ) );
/* Make sure the memory allocation size computation does not overflow */
if ( maximum_pending_messages > SIZE_MAX / buffer_size ) {
return false;
}
the_message_queue->message_buffers = _Workspace_Allocate(
(size_t) maximum_pending_messages * buffer_size
);
if ( the_message_queue->message_buffers == NULL ) {
return false;
}
/*
* Initialize the pool of inactive messages, pending messages,
* and set of waiting threads.
*/
_Chain_Initialize (
&the_message_queue->Inactive_messages,
the_message_queue->message_buffers,
(size_t) maximum_pending_messages,
buffer_size
);
_Chain_Initialize_empty( &the_message_queue->Pending_messages );
_Thread_queue_Object_initialize( &the_message_queue->Wait_queue );
if ( discipline == CORE_MESSAGE_QUEUE_DISCIPLINES_PRIORITY ) {
the_message_queue->operations = &_Thread_queue_Operations_priority;
} else {
the_message_queue->operations = &_Thread_queue_Operations_FIFO;
}
return true;
}
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