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)  |