LispWorks Release Notes and Installation Guide > 13 Release Notes > 13.2 Symmetric Multiprocessing


13.2.4 New features of locks

mp:make-lock now offers control over whether a lock can be locked recursively. Non-recursive locks can be useful for debugging code where a lock is not expected to be claimed recursively.

mp:make-lock also allows you to create "sharing" locks which support sharing and exclusive locking.

See mp:make-lock in the LispWorks User Guide and Reference Manual for details.

There are new APIs for querying locks: mp:lock-recursive-p , mp:lock-owned-by-current-process-p , mp:lock-locked-p and mp:lock-recursively-locked-p .

Additionally mp:lock-owner now checks for an exclusive lock in the case of a sharing lock.

The performance of locks has been improved.

LispWorks Release Notes and Installation Guide - 21 Dec 2009