Abstract: The present invention is a system and method for "checking the use of synchronization locks in a multi-threaded computer program" (hereinafter "WARLOCK II"). In Warlock II a set of source code representing a process which includes multiple threads may be annotated by the developer using a "NOTE" macro to describe the desired operation of the locks. This annotated source code is passed to a modified ANSI C compiler which outputs a special file designated a ".ll" file, as for example, file "foo.ll". This special ".ll" file is then processed as input along with other designated ".ll" files which might be related, by a "wlanalyze" program which will check the source code of the target programs in the ".ll" files to determine whether their use of synchronization locks is consistent with the intended use as specified in the annotations.