38     int ec = __libcpp_mutex_lock(&__m_);  in lock()
46     return __libcpp_mutex_trylock(&__m_);  in try_lock()
52     int ec = __libcpp_mutex_unlock(&__m_);  in unlock()
61     int ec = __libcpp_recursive_mutex_init(&__m_);  in recursive_mutex()
68     int e = __libcpp_recursive_mutex_destroy(&__m_);  in ~recursive_mutex()
76     int ec = __libcpp_recursive_mutex_lock(&__m_);  in lock()
84     int e = __libcpp_recursive_mutex_unlock(&__m_);  in unlock()
92     return __libcpp_recursive_mutex_trylock(&__m_);  in try_lock()
104     lock_guard<mutex> _(__m_);  in ~timed_mutex()
110     unique_lock<mutex> lk(__m_);  in lock()
119     unique_lock<mutex> lk(__m_, try_to_lock);  in try_lock()
131     lock_guard<mutex> _(__m_);  in unlock()
146     lock_guard<mutex> _(__m_);  in ~recursive_timed_mutex()
153     unique_lock<mutex> lk(__m_);  in lock()
171     unique_lock<mutex> lk(__m_, try_to_lock);  in try_lock()
186     unique_lock<mutex> lk(__m_);  in unlock()