| Allegro CL version 8.2 Unrevised from 8.1 to 8.2. 8.1 version |
Arguments: lock
This function returns the value of the locker slot of
lock, which must be a lock object (see make-process-lock). This value is
usually the process holding the lock. If the value in the slot is
nil
, the lock is free. The following idiom is
useful when a process wants to seize a lock but not block if it is
already seized:
(without-interrupts (if (process-lock-locker lock) (...) ;; Lock not free ;; do something else. (process-lock lock))) ;; Seize the lock.
See process-lock, process-unlock, with-process-lock and make-process-lock.
See multiprocessing.htm for general information on multiprocessing in Allegro CL and see Process locks for more information on process locks in Allegro CL.
Copyright (c) 1998-2016, Franz Inc. Oakland, CA., USA. All rights reserved.
This page was not revised from the 8.1 page.
Created 2010.1.21.
| Allegro CL version 8.2 Unrevised from 8.1 to 8.2. 8.1 version |