int mq_notify(
mqd_t mqdes,
const struct sigevent *notification
)
{
POSIX_Message_queue_Control *the_mq;
POSIX_Message_queue_Control_fd *the_mq_fd;
Objects_Locations location;
the_mq_fd = _POSIX_Message_queue_Get_fd( mqdes, &location );
switch ( location ) {
case OBJECTS_LOCAL:
the_mq = the_mq_fd->Queue;
if ( notification ) {
if ( _CORE_message_queue_Is_notify_enabled( &the_mq->Message_queue ) ) {
_Thread_Enable_dispatch();
rtems_set_errno_and_return_minus_one( EBUSY );
}
_CORE_message_queue_Set_notify( &the_mq->Message_queue, NULL, NULL );
the_mq->notification = *notification;
_CORE_message_queue_Set_notify(
&the_mq->Message_queue,
_POSIX_Message_queue_Notify_handler,
the_mq
);
} else {
_CORE_message_queue_Set_notify( &the_mq->Message_queue, NULL, NULL );
}
_Thread_Enable_dispatch();
return 0;
#if defined(RTEMS_MULTIPROCESSING)
case OBJECTS_REMOTE:
#endif
case OBJECTS_ERROR:
break;
}
rtems_set_errno_and_return_minus_one( EBADF );
}
void _POSIX_Message_queue_Notify_handler(
void *user_data
)
{
POSIX_Message_queue_Control *the_mq;
the_mq = user_data;
kill( getpid(), the_mq->notification.sigev_signo );
_CORE_message_queue_Set_notify( &the_mq->Message_queue, NULL, NULL );
}
bool _CORE_message_queue_Initialize(
CORE_message_queue_Control *the_message_queue,
CORE_message_queue_Attributes *the_message_queue_attributes,
uint32_t maximum_pending_messages,
size_t maximum_message_size
)
{
size_t message_buffering_required;
size_t allocated_message_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, NULL );
/*
* Round size up to multiple of a pointer for chain init and
* check for overflow on adding overhead to each message.
*/
allocated_message_size = maximum_message_size;
if (allocated_message_size & (sizeof(uint32_t) - 1)) {
allocated_message_size += sizeof(uint32_t);
allocated_message_size &= ~(sizeof(uint32_t) - 1);
}
if (allocated_message_size < maximum_message_size)
return false;
/*
* Calculate how much total memory is required for message buffering and
* check for overflow on the multiplication.
*/
message_buffering_required = (size_t) maximum_pending_messages *
(allocated_message_size + sizeof(CORE_message_queue_Buffer_control));
if (message_buffering_required < allocated_message_size)
return false;
/*
* Attempt to allocate the message memory
*/
the_message_queue->message_buffers = (CORE_message_queue_Buffer *)
_Workspace_Allocate( message_buffering_required );
if (the_message_queue->message_buffers == 0)
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,
allocated_message_size + sizeof( CORE_message_queue_Buffer_control )
);
_Chain_Initialize_empty( &the_message_queue->Pending_messages );
_Thread_queue_Initialize(
&the_message_queue->Wait_queue,
_CORE_message_queue_Is_priority( the_message_queue_attributes ) ?
THREAD_QUEUE_DISCIPLINE_PRIORITY : THREAD_QUEUE_DISCIPLINE_FIFO,
STATES_WAITING_FOR_MESSAGE,
CORE_MESSAGE_QUEUE_STATUS_TIMEOUT
);
return true;
}
bool _CORE_message_queue_Initialize(
CORE_message_queue_Control *the_message_queue,
CORE_message_queue_Attributes *the_message_queue_attributes,
uint32_t maximum_pending_messages,
size_t maximum_message_size
)
{
size_t message_buffering_required = 0;
size_t allocated_message_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, NULL );
allocated_message_size = maximum_message_size;
/*
* Check if allocated_message_size is aligned to uintptr-size boundary.
* If not, it will increase allocated_message_size to multiplicity of pointer
* size.
*/
if (allocated_message_size & (sizeof(uintptr_t) - 1)) {
allocated_message_size += sizeof(uintptr_t);
allocated_message_size &= ~(sizeof(uintptr_t) - 1);
}
/*
* Check for an overflow. It can occur while increasing allocated_message_size
* to multiplicity of uintptr_t above.
*/
if (allocated_message_size < maximum_message_size)
return false;
/*
* Calculate how much total memory is required for message buffering and
* check for overflow on the multiplication.
*/
if ( !size_t_mult32_with_overflow(
(size_t) maximum_pending_messages,
allocated_message_size + sizeof(CORE_message_queue_Buffer_control),
&message_buffering_required ) )
return false;
/*
* Attempt to allocate the message memory
*/
the_message_queue->message_buffers = (CORE_message_queue_Buffer *)
_Workspace_Allocate( message_buffering_required );
if (the_message_queue->message_buffers == 0)
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,
allocated_message_size + sizeof( CORE_message_queue_Buffer_control )
);
_Chain_Initialize_empty( &the_message_queue->Pending_messages );
_Thread_queue_Initialize(
&the_message_queue->Wait_queue,
_CORE_message_queue_Is_priority( the_message_queue_attributes ) ?
THREAD_QUEUE_DISCIPLINE_PRIORITY : THREAD_QUEUE_DISCIPLINE_FIFO,
STATES_WAITING_FOR_MESSAGE,
CORE_MESSAGE_QUEUE_STATUS_TIMEOUT
);
return true;
}
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 message_buffering_required = 0;
size_t aligned_message_size;
size_t align_mask;
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 );
/*
* Align up the maximum message size to be an integral multiple of the
* pointer size.
*/
align_mask = sizeof(uintptr_t) - 1;
aligned_message_size = ( maximum_message_size + align_mask ) & ~align_mask;
/*
* Check for an integer overflow. It can occur while aligning up the maximum
* message size.
*/
if (aligned_message_size < maximum_message_size)
return false;
/*
* Calculate how much total memory is required for message buffering and
* check for overflow on the multiplication.
*/
if ( !size_t_mult32_with_overflow(
(size_t) maximum_pending_messages,
aligned_message_size + sizeof(CORE_message_queue_Buffer_control),
&message_buffering_required ) )
return false;
/*
* Attempt to allocate the message memory
*/
the_message_queue->message_buffers = (CORE_message_queue_Buffer *)
_Workspace_Allocate( message_buffering_required );
if (the_message_queue->message_buffers == 0)
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,
aligned_message_size + sizeof( CORE_message_queue_Buffer_control )
);
_Chain_Initialize_empty( &the_message_queue->Pending_messages );
_Thread_queue_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;
}
