Like process-lock, but on a "sharing" lock.
A sharing lock.
The status of the process while lock is locked, as seen in the Process Browser.
It is not possible to use exclusive lock in the scope of a sharing lock on the same lock, and trying to do this will cause the process to hang. Whether it is possible to use an exclusive lock inside an exclusive lock of the same lock is determined by the recursivep argument in make-lock.
process-exclusive-lock is guaranteed to return if it locked sharing-lock, but may throw before locking, as described in Guarantees and limitations when locking and unlocking.
LispWorks User Guide and Reference Manual - 20 Sep 2017