put-semaphore

Arguments: gate

Gates can be used as semaphores. Each gate created by make-gate has an associated semaphore count that starts at 0. put-semaphore increments the gate's semaphore count, opens the gate, and then releases just one of the threads waiting on that gate, if there are any. This differs from a call to open-gate, which releases all threads waiting on the gate. This can be more efficient than open-gate when several threads are processing a work queue. mp:enqueue and mp:dequeue use semaphores internally to get the improved efficiency. See get-semaphore.

See multiprocessing.htm for general information on multiprocessing in Allegro CL.

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Created 2019.8.20.