782   _STLP_mutex _M_lock;  member
824   class _M_lock;
825   friend class _M_lock;
826   class _M_lock {  class in _Pthread_alloc_impl
828     _M_lock () { _S_chunk_allocator_lock._M_acquire_lock(); }  in _M_lock()  function in _Pthread_alloc_impl::_M_lock
829     ~_M_lock () { _S_chunk_allocator_lock._M_release_lock(); }  in ~_M_lock()
885   _M_lock __lock_instance;  // Need to acquire lock here.  in _S_destructor()
911   _M_lock __lock_instance;  // Need to acquire lock here.  in _S_get_per_thread_state()
942     _M_lock __lock_instance;         // Acquire lock for this routine  in _S_chunk_alloc()
1046   _STLP_auto_lock __lock(__a->_M_lock);  in allocate()
1071   _STLP_auto_lock __lock(__a->_M_lock);  in deallocate()