RTEMS C User's Guide
When a message queue is created, RTEMS generates a
unique message queue ID. The message queue ID may be obtained
by either of two methods. First, as the result of an invocation
of the rtems_message_queue_create directive, the
queue ID is stored in a user provided location. Second, the queue
ID may be obtained later using the rtems_message_queue_ident
directive. The queue ID is used by other message manager
directives to access this message queue.
RTEMS C User's Guide
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