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Matthew Mondor authored
MP:TRY-GET-SEMAPHORE returns NIL if the semaphore could not be obtained, or the count if it could be obtained MP:MAILBOX-TRY-READ returns a message if it's available, NIL if the queue is empty MP:MAILBOX-TRY-SEND returns the sent message if it could be queued, or NIL (mailbox is full)
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