mtx_unlock
From cppreference.com
                    
                                        
                    
                    
                                                            
                    | Defined in header  <threads.h> | ||
| int mtx_unlock( mtx_t *mutex ); | (since C11) | |
Unlocks the mutex pointed to by mutex. 
The behavior is undefined if the mutex is not locked by the calling thread.
[edit] Parameters
| mutex | - | pointer to the mutex to unlock | 
[edit] Return value
thrd_success if successful, thrd_error otherwise.
[edit] See also
| (C11) | blocks until locks a mutex (function) | 
| (C11) | blocks until locks a mutex or times out (function) | 
| (C11) | locks a mutex or returns without blocking if already locked (function) | 


