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/Perl 5.22

lock

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.

The value returned is the scalar itself, if the argument is a scalar, or a reference, if the argument is a hash, array or subroutine.

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. If you are not under use threads::shared this does nothing. See threads::shared.

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http://perldoc.perl.org/5.22.0/functions/lock.html