ssize_t _POSIX_Message_queue_Receive_support( mqd_t mqdes, char *msg_ptr, size_t msg_len, unsigned int *msg_prio, bool wait, Watchdog_Interval timeout ) { POSIX_Message_queue_Control *the_mq; POSIX_Message_queue_Control_fd *the_mq_fd; Objects_Locations location; size_t length_out; bool do_wait; the_mq_fd = _POSIX_Message_queue_Get_fd( mqdes, &location ); switch ( location ) { case OBJECTS_LOCAL: if ( (the_mq_fd->oflag & O_ACCMODE) == O_WRONLY ) { _Thread_Enable_dispatch(); rtems_set_errno_and_return_minus_one( EBADF ); } the_mq = the_mq_fd->Queue; if ( msg_len < the_mq->Message_queue.maximum_message_size ) { _Thread_Enable_dispatch(); rtems_set_errno_and_return_minus_one( EMSGSIZE ); } /* * Now if something goes wrong, we return a "length" of -1 * to indicate an error. */ length_out = -1; /* * A timed receive with a bad time will do a poll regardless. */ if ( wait ) do_wait = (the_mq_fd->oflag & O_NONBLOCK) ? false : true; else do_wait = wait; /* * Now perform the actual message receive */ _CORE_message_queue_Seize( &the_mq->Message_queue, mqdes, msg_ptr, &length_out, do_wait, timeout ); _Thread_Enable_dispatch(); if (msg_prio) { *msg_prio = _POSIX_Message_queue_Priority_from_core( _Thread_Executing->Wait.count ); } if ( !_Thread_Executing->Wait.return_code ) return length_out; rtems_set_errno_and_return_minus_one( _POSIX_Message_queue_Translate_core_message_queue_return_code( _Thread_Executing->Wait.return_code ) ); #if defined(RTEMS_MULTIPROCESSING) case OBJECTS_REMOTE: #endif case OBJECTS_ERROR: break; } rtems_set_errno_and_return_minus_one( EBADF ); }
int _POSIX_Message_queue_Send_support( mqd_t mqdes, const char *msg_ptr, size_t msg_len, unsigned int msg_prio, bool wait, Watchdog_Interval timeout ) { POSIX_Message_queue_Control *the_mq; POSIX_Message_queue_Control_fd *the_mq_fd; Objects_Locations location; CORE_message_queue_Status msg_status; bool do_wait; Thread_Control *executing; ISR_lock_Context lock_context; /* * Validate the priority. * XXX - Do not validate msg_prio is not less than 0. */ if ( msg_prio > MQ_PRIO_MAX ) rtems_set_errno_and_return_minus_one( EINVAL ); the_mq_fd = _POSIX_Message_queue_Get_fd_interrupt_disable( mqdes, &location, &lock_context ); switch ( location ) { case OBJECTS_LOCAL: if ( (the_mq_fd->oflag & O_ACCMODE) == O_RDONLY ) { _ISR_lock_ISR_enable( &lock_context ); rtems_set_errno_and_return_minus_one( EBADF ); } the_mq = the_mq_fd->Queue; /* * A timed receive with a bad time will do a poll regardless. */ if ( wait ) do_wait = (the_mq_fd->oflag & O_NONBLOCK) ? false : true; else do_wait = wait; /* * Now perform the actual message receive */ executing = _Thread_Executing; msg_status = _CORE_message_queue_Submit( &the_mq->Message_queue, executing, msg_ptr, msg_len, mqdes, /* mqd_t is an object id */ NULL, _POSIX_Message_queue_Priority_to_core( msg_prio ), do_wait, timeout, /* no timeout */ &lock_context ); /* * If we had to block, then this is where the task returns * after it wakes up. The returned status is correct for * non-blocking operations but if we blocked, then we need * to look at the status in our TCB. */ if ( msg_status == CORE_MESSAGE_QUEUE_STATUS_UNSATISFIED_WAIT ) msg_status = executing->Wait.return_code; if ( !msg_status ) return msg_status; rtems_set_errno_and_return_minus_one( _POSIX_Message_queue_Translate_core_message_queue_return_code( msg_status ) ); #if defined(RTEMS_MULTIPROCESSING) case OBJECTS_REMOTE: #endif case OBJECTS_ERROR: break; } rtems_set_errno_and_return_minus_one( EBADF ); }
ssize_t _POSIX_Message_queue_Receive_support( mqd_t mqdes, char *msg_ptr, size_t msg_len, unsigned int *msg_prio, bool wait, Watchdog_Interval timeout ) { POSIX_Message_queue_Control *the_mq; ISR_lock_Context lock_context; size_t length_out; bool do_wait; Thread_Control *executing; the_mq = _POSIX_Message_queue_Get( mqdes, &lock_context ); if ( the_mq == NULL ) { rtems_set_errno_and_return_minus_one( EBADF ); } if ( ( the_mq->oflag & O_ACCMODE ) == O_WRONLY ) { _ISR_lock_ISR_enable( &lock_context ); rtems_set_errno_and_return_minus_one( EBADF ); } if ( msg_len < the_mq->Message_queue.maximum_message_size ) { _ISR_lock_ISR_enable( &lock_context ); rtems_set_errno_and_return_minus_one( EMSGSIZE ); } /* * Now if something goes wrong, we return a "length" of -1 * to indicate an error. */ length_out = -1; /* * A timed receive with a bad time will do a poll regardless. */ if ( wait ) { do_wait = ( the_mq->oflag & O_NONBLOCK ) == 0; } else { do_wait = wait; } _CORE_message_queue_Acquire_critical( &the_mq->Message_queue, &lock_context ); if ( the_mq->open_count == 0 ) { _CORE_message_queue_Release( &the_mq->Message_queue, &lock_context ); rtems_set_errno_and_return_minus_one( EBADF ); } /* * Now perform the actual message receive */ executing = _Thread_Executing; _CORE_message_queue_Seize( &the_mq->Message_queue, executing, mqdes, msg_ptr, &length_out, do_wait, timeout, &lock_context ); if ( msg_prio != NULL ) { *msg_prio = _POSIX_Message_queue_Priority_from_core( executing->Wait.count ); } if ( executing->Wait.return_code != CORE_MESSAGE_QUEUE_STATUS_SUCCESSFUL ) { rtems_set_errno_and_return_minus_one( _POSIX_Message_queue_Translate_core_message_queue_return_code( executing->Wait.return_code ) ); } return length_out; }