
The lock to be relinquished.
When this is t , an error is signalled if *current-process* is not the owner of the lock. The default is t .
Attempts to unset a lock. If the lock is owned by *current-process* , process-unlock decrements the lock count by 1. If the lock count is now nil , the lock is released. Note that process-unlock relates only on Lisp processes.