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/**
* @file
*
* @brief Broadcast a Message to the Message Queue
* @ingroup ScoreMessageQueue
*/
/*
* COPYRIGHT (c) 1989-2008.
* 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.com/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/system.h>
#include <rtems/score/chain.h>
#include <rtems/score/isr.h>
#include <rtems/score/object.h>
#include <rtems/score/coremsgimpl.h>
#include <rtems/score/states.h>
#include <rtems/score/thread.h>
#include <rtems/score/wkspace.h>
CORE_message_queue_Status _CORE_message_queue_Broadcast(
CORE_message_queue_Control *the_message_queue,
const void *buffer,
size_t size,
#if defined(RTEMS_MULTIPROCESSING)
Objects_Id id,
CORE_message_queue_API_mp_support_callout api_message_queue_mp_support,
#else
Objects_Id id __attribute__((unused)),
CORE_message_queue_API_mp_support_callout api_message_queue_mp_support __attribute__((unused)),
#endif
uint32_t *count
)
{
Thread_Control *the_thread;
uint32_t number_broadcasted;
Thread_Wait_information *waitp;
if ( size > the_message_queue->maximum_message_size ) {
return CORE_MESSAGE_QUEUE_STATUS_INVALID_SIZE;
}
/*
* If there are pending messages, then there can't be threads
* waiting for us to send them a message.
*
* NOTE: This check is critical because threads can block on
* send and receive and this ensures that we are broadcasting
* the message to threads waiting to receive -- not to send.
*/
if ( the_message_queue->number_of_pending_messages != 0 ) {
*count = 0;
return CORE_MESSAGE_QUEUE_STATUS_SUCCESSFUL;
}
/*
* There must be no pending messages if there is a thread waiting to
* receive a message.
*/
number_broadcasted = 0;
while ((the_thread =
_Thread_queue_Dequeue(&the_message_queue->Wait_queue))) {
waitp = &the_thread->Wait;
number_broadcasted += 1;
_CORE_message_queue_Copy_buffer(
buffer,
waitp->return_argument_second.mutable_object,
size
);
*(size_t *) the_thread->Wait.return_argument = size;
#if defined(RTEMS_MULTIPROCESSING)
if ( !_Objects_Is_local_id( the_thread->Object.id ) )
(*api_message_queue_mp_support) ( the_thread, id );
#endif
}
*count = number_broadcasted;
return CORE_MESSAGE_QUEUE_STATUS_SUCCESSFUL;
}
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