std::unique_lock::unique_lock - cppreference.com (original) (raw)

unique_lock() noexcept; (1) (since C++11)
unique_lock( unique_lock&& other ) noexcept; (2) (since C++11)
explicit unique_lock( mutex_type& m ); (3) (since C++11)
unique_lock( mutex_type& m, std::defer_lock_t t ) noexcept; (4) (since C++11)
unique_lock( mutex_type& m, std::try_to_lock_t t ); (5) (since C++11)
unique_lock( mutex_type& m, std::adopt_lock_t t ); (6) (since C++11)
template< class Rep, class Period > unique_lock( mutex_type& m, const std::chrono::duration<Rep, Period>& timeout_duration ); (7) (since C++11)
template< class Clock, class Duration > unique_lock( mutex_type& m, const std::chrono::time_point<Clock, Duration>& timeout_time ); (8) (since C++11)

Constructs a unique_lock, optionally locking the supplied mutex.

  1. Constructs a unique_lock with no associated mutex.

  2. Move constructor. Initializes the unique_lock with the contents of other. Leaves other with no associated mutex.

3-8) Constructs a unique_lock with m as the associated mutex. Additionally:

  1. Locks the associated mutex by calling m.lock().

  2. Does not lock the associated mutex.

  3. Tries to lock the associated mutex without blocking by calling m.try_lock(). The behavior is undefined if Mutex does not satisfy Lockable.

  4. Assumes the calling thread already holds a non-shared lock (i.e., a lock acquired by lock, try_lock, try_lock_for, or try_lock_until) on m. The behavior is undefined if not so.

  5. Tries to lock the associated mutex by calling m.try_lock_for(timeout_duration). Blocks until specified timeout_duration has elapsed or the lock is acquired, whichever comes first. May block for longer than timeout_duration. The behavior is undefined if Mutex does not satisfy TimedLockable.

  6. Tries to lock the associated mutex by calling m.try_lock_until(timeout_time). Blocks until specified timeout_time has been reached or the lock is acquired, whichever comes first. May block for longer than until timeout_time has been reached. The behavior is undefined if Mutex does not satisfy TimedLockable.

[edit] Parameters

other - another unique_lock to initialize the state with
m - mutex to associate with the lock and optionally acquire ownership of
t - tag parameter used to select constructors with different locking strategies
timeout_duration - maximum duration to block for
timeout_time - maximum time point to block until

[edit] Example

Output:

12'th and 13'th Fibonacci numbers: 144 and 233