33     int ec = __libcpp_mutex_lock(&__m_);  in lock()
41     return __libcpp_mutex_trylock(&__m_);  in try_lock()
47     int ec = __libcpp_mutex_unlock(&__m_);  in unlock()
56     int ec = __libcpp_recursive_mutex_init(&__m_);  in recursive_mutex()
63     int e = __libcpp_recursive_mutex_destroy(&__m_);  in ~recursive_mutex()
71     int ec = __libcpp_recursive_mutex_lock(&__m_);  in lock()
79     int e = __libcpp_recursive_mutex_unlock(&__m_);  in unlock()
87     return __libcpp_recursive_mutex_trylock(&__m_);  in try_lock()
99     lock_guard<mutex> _(__m_);  in ~timed_mutex()
105     unique_lock<mutex> lk(__m_);  in lock()
114     unique_lock<mutex> lk(__m_, try_to_lock);  in try_lock()
126     lock_guard<mutex> _(__m_);  in unlock()
141     lock_guard<mutex> _(__m_);  in ~recursive_timed_mutex()
148     unique_lock<mutex> lk(__m_);  in lock()
166     unique_lock<mutex> lk(__m_, try_to_lock);  in try_lock()
181     unique_lock<mutex> lk(__m_);  in unlock()