The status of the process while lock is locked, as seen in the Process Browser.
The forms to execute.
with-lock executes body while holding lock, and unlocks lock when body exits. This is the recommended way of using a lock. The value of body is returned normally. body is not executed if lock could not be locked, in which case,
nil. The timeout and whostate are used as specified by process-lock.
LispWorks User Guide and Reference Manual - 20 Sep 2017