* Sam Varshavchik: > libcxx.so gets built by gcc.7.3.1 with -std=c++17 -O2 > -fvisibility-inlines- hidden, -fno-omit-frame-pointer, and > -pthread. It contains some static variables that are instantiated > templates. It contains other static variables whose constructors > invoke the instantiated templates' methods that construct and > destruct std::unique_lock<std::mutex> of std::mutexes that are > static variables of the instantiated templates. Static > initialization of libcxx.so does not create any execution thread. What's the binding type for __pthread_key_create in libcxx.so? I assume that's the symbol used as a key for __gthread_active_p.