[Bug libstdc++/47354] bitmap_allocator free_list::_M_get never locks mutex

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47354

Jonathan Wakely <redi at gcc dot gnu.org> changed:

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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-01-19 00:37:39 UTC ---
Comment on attachment 23023
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23023
Add a mutex lock step in bitmap_allocator.cc

the patch looks correct