alias(Alias)

Queue has the given alias name.

max_size(Size)

Maximum number of terms that can be in the queue. See message_queue_create/2. This property is not present if there is no limit (default).

size(Size)

Queue currently contains Size terms. Note that due to concurrent access the returned value may be outdated before it is returned. It can be used for debugging purposes as well as work distribution purposes.

waiting(-Count)

Number of threads waiting for this queue. This property is not present if no threads waits for this queue.

The size(Size) property is always present and may be used to enumerate the created message queues. Note that this predicate does not enumerate threads, but can be used to query the properties of the default queue of a thread.