mq_open(3RT)

Connects to, and optionally creates, a named message queue 

mq_close(3RT)

Ends the connection to an open message queue 

mq_unlink(3RT)

Ends the connection to an open message queue and causes the queue to be removed when the last process closes it 

mq_send(3RT)

Places a message in the queue 

mq_receive(3RT)

Receives (removes) the oldest, highest priority message from the queue 

mq_notify(3RT)

Notifies a process or thread that a message is available in the queue 

mq_setattr(3RT), mq_getattr(3RT)

Set or get message queue attributes