C++11 std::mutex in Visual Studio 2012 deadlock when locked from DllMain()

Question

I am seeing a deadlock with std::mutex when the mutex is locked from DllMain() Below is a minimal DLL test case that exhibits the problem for me. M

Answer 1

Check the Best Practices for Creating DLLs document:

You should never perform the following tasks from within DllMain:

• Call LoadLibrary or LoadLibraryEx (either directly or indirectly). This can cause a deadlock or a crash.
• Synchronize with other threads. This can cause a deadlock.