https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81195
--- Comment #6 from Jim Wilson <wilson at gcc dot gnu.org> --- I should point out that there are currently four places that use newunit_stack/newunit_tos without locking. Two of these places required locking code to get wrf working. The other two are init_units and close_units. These are called from a constructor and a destructor. Presumably these can only be called once, and hence don't require locking code. Though curiously, close_units has some locking code anyways. I'm not sure why. I saw no failures here, and hence didn't bother to add any locking.
