/usr/lib/swipl/library/lazy_lists.pl
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 lazy_message_queue(+Queue, +Options, -List, -Tail) is det
Lazy list iterator for message queues. Options are passed to thread_get_message/3. In addition, the following options are processed:
chunk(ChunkSize)
Determines the read chunk size. Default is 1.

A thread can listen to its own message queue using

        thread_self(Me),
        lazy_list(lazy_message_queue(Me, []), List),
        phrase(action(List)).