EricWF added a comment.
Unfortunately the discussion was offline so it's not available.
Anybody using `std::mutex` with `std::unique_lock` or their own lock guards
will probably experience some breakage.
Heres an example of code that will now not compile with "-Werror=thread-safety"
std::mutex m;
m.lock();
{
std::unique_lock<std::mutex> g(m, std::adopt_lock);
} // -Wthread-safety thinks `m` is still locked
AFAIK we can't fully annotate `std::unique_lock` either because there is no way
to model the deferred locking behavior.
http://reviews.llvm.org/D14731
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