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/**
* @file
*
* @ingroup POSIX_MQUEUE
*
* @brief Notify Process that a Message is Available on a Queue
*/
/*
* COPYRIGHT (c) 1989-2007.
* 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/posix/mqueueimpl.h>
#include <signal.h>
static void _POSIX_Message_queue_Notify_handler(
CORE_message_queue_Control *the_message_queue,
Thread_queue_Context *queue_context
)
{
POSIX_Message_queue_Control *the_mq;
int signo;
the_mq = RTEMS_CONTAINER_OF(
the_message_queue,
POSIX_Message_queue_Control,
Message_queue
);
signo = the_mq->notification.sigev_signo;
_CORE_message_queue_Set_notify( &the_mq->Message_queue, NULL );
_CORE_message_queue_Release( &the_mq->Message_queue, queue_context );
kill( getpid(), signo );
}
int mq_notify(
mqd_t mqdes,
const struct sigevent *notification
)
{
POSIX_Message_queue_Control *the_mq;
Thread_queue_Context queue_context;
the_mq = _POSIX_Message_queue_Get( mqdes, &queue_context );
if ( the_mq == NULL ) {
rtems_set_errno_and_return_minus_one( EBADF );
}
_CORE_message_queue_Acquire_critical(
&the_mq->Message_queue,
&queue_context
);
if ( the_mq->open_count == 0 ) {
_CORE_message_queue_Release( &the_mq->Message_queue, &queue_context );
rtems_set_errno_and_return_minus_one( EBADF );
}
if ( notification != NULL ) {
if ( _CORE_message_queue_Is_notify_enabled( &the_mq->Message_queue ) ) {
_CORE_message_queue_Release( &the_mq->Message_queue, &queue_context );
rtems_set_errno_and_return_minus_one( EBUSY );
}
the_mq->notification = *notification;
_CORE_message_queue_Set_notify(
&the_mq->Message_queue,
_POSIX_Message_queue_Notify_handler
);
} else {
_CORE_message_queue_Set_notify( &the_mq->Message_queue, NULL );
}
_CORE_message_queue_Release( &the_mq->Message_queue, &queue_context );
return 0;
}
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