std::unique_lock<Mutex>::release (3) - Linux Man Pages
mutex_type* release() noexcept; (since C++11)
Breaks the association of the associated mutex, if any, and *this.
No locks are unlocked. If the *this held ownership of the associated mutex prior to the call, the caller is now responsible to unlock the mutex.
Pointer to the associated mutex or NULL if there was no associated mutex.
This section is incomplete
Reason: no example
unlock (public member function)