Minor fixup in <ratio> and add optional support for shared_mutex and upgrade_mutex which must be opted into with #define _LIBCPP_SHARED_LOCK

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@120258 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed
tree: 6236c60949c5cd88652faa1faf8721c4574036d6
  1. include/
  2. lib/
  3. src/
  4. test/
  5. www/
  6. CREDITS.TXT
  7. LICENSE.TXT
  8. Makefile