=item lock THING
-This function places an advisory lock on a variable, subroutine,
-or referenced object contained in I<THING> until the lock goes out
-of scope.
+This function places an advisory lock on a shared variable, or referenced
+object contained in I<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 C<use Thread>, lock() is always a
-keyword.) See L<Thread>.
+instead. (However, if you've said C<use threads>, lock() is always a
+keyword.) See L<threads>.
=item log EXPR