SWI-Prolog -- thread_peek_message/2

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Predicate thread_peek_message/2

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Documentation
- Reference manual
  - Multithreaded applications
    - Thread communication
      - Message queues
        
        thread_send_message/2
        
        thread_send_message/3
        
        thread_get_message/1
        
        thread_peek_message/1
        
        message_queue_create/1
        
        message_queue_create/2
        
        message_queue_destroy/1
        
        is_message_queue/1
        
        thread_get_message/2
        
        thread_get_message/3
        
        thread_peek_message/2
        
        message_queue_property/2
        
        message_queue_set/2
- Packages

Availability:built-in

[semidet]thread_peek_message(+Queue, ?Term)

As thread_peek_message/1, operating on a given queue. It is allowed to peek into another thread's message queue, an operation that can be used to check whether a thread has swallowed a message sent to it.