sharable-lock-unlock

Arguments: sharable-lock mode

Release a sharable-lock in the specified mode.

The value returned is nil or one of the keywords :unlocked or :recursive.

The mode argument must be one of the keywords :shared or :exclusive.

If the lock is locked in the specifed mode, the locker count is decremented. If the count is still not zero, the keyword :recursive is returned. If the count is zero, the keyword :unlocked is returned.

If the lock is not locked, and safe-p (when the lock was created with make-sharable-lock) is nil, nil is returned.

Note that a call to sharable-lock-unlock can only release a lock acquired with a call to sharable-lock-lock. The locks established with the with-shared-lock and with-exclusive-lock macros can only be released by exiting the dynamic context of the macro calls.

See Sharable locks in smp.htm.

Copyright (c) 1998-2015, Franz Inc. Oakland, CA., USA. All rights reserved.
Documentation for Allegro CL version 10.0. This page was not revised from the 9.0 page.
Created 2015.5.21.