std::mutex::native_handle
From cppreference.com
                    
                                        
                    
                    
                                                            
                    
| native_handle_type native_handle(); | (since C++11) (not always present) | |
Returns the underlying implementation-defined native handle object.
Parameters
(none)
Return value
Implementation-defined native handle object.
Exceptions
Implementation-defined.
Example
| This section is incomplete Reason: no example |