Perl 5 version 8.9 documentation
- lock THING
This function places an advisory lock on a shared variable, or referenced object contained in THING until the lock goes out of scope.
lock() is a "weak keyword" : this means that if you've defined a function by this name (before any calls to it), that function will be called instead. (However, if you've said
use threads, lock() is always a keyword.) See threads.