SWI-Prolog -- thread_send

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
        
        thread_get_message/2
        
        thread_get_message/3
        
        thread_peek_message/2
        
        message_queue_property/2
- Packages

Availability:built-in

[semidet]thread_send_message(+Queue, +Term, +Options)

As thread_send_message/2, but providing additional Options. These are to deal with the case that the queue has a finite maximum size and is full: whereas thread_send_message/2 will block until the queue has drained sufficiently to accept a new message, thread_send_message/3 can accept a time-out or deadline analogously to thread_get_message/3. The options are:

deadline(+AbsTime)

The call fails (silently) if no space has become available before AbsTime. See get_time/1 for the representation of absolute time. If AbsTime is earlier then the current time, thread_send_message/3 fails immediately. Both resolution and maximum wait time is platform-dependent.^{162The
implementation uses MsgWaitForMultipleObjects() on MS-Windows and
pthread_cond_timedwait() on other systems.}

timeout(+Time)

Time is a float or integer and specifies the maximum time to wait in seconds. This is a relative-time version of the deadline option. If both options are provided, the earlier time is effective.

If Time is 0 or 0.0, thread_send_message/3 examines the queue and sends the message if space is availabel, but does not suspend if no space is available, failing immediately instead.

If Time < 0, thread_send_message/3 fails immediately without sending the message.