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.

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

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Created 2012.5.30.