Thread communication¶

Prolog threads can exchange data using dynamic predicates, database records, and other globally shared data.

These provide no suitable means to wait for data or a condition as they can only be checked in an expensive polling loop. Message queues provide a means for threads to wait for data or conditions without using the CPU.

Each thread has a message-queue attached to it that is identified by the thread. Additional queues are created using message_queue_create//22.

• thread_peek_message/2
• thread_peek_message/1
• thread_get_message/2
• thread_get_message/1
• thread_send_message/2
• thread_send_message/1
• message_queue_destroy/1
• message_queue_create/1