4.3 KiB
[thread.lock.unique.general]
32 Concurrency support library [thread]
32.6 Mutual exclusion [thread.mutex]
32.6.5 Locks [thread.lock]
32.6.5.4 Class template unique_lock [thread.lock.unique]
32.6.5.4.1 General [thread.lock.unique.general]
namespace std {templateclass unique_lock {public:using mutex_type = Mutex; // [thread.lock.unique.cons], construct/copy/destroy unique_lock() noexcept; explicit unique_lock(mutex_type& m); unique_lock(mutex_type& m, defer_lock_t) noexcept; unique_lock(mutex_type& m, try_to_lock_t); unique_lock(mutex_type& m, adopt_lock_t); template<class Clock, class Duration> unique_lock(mutex_type& m, const chrono::time_point<Clock, Duration>& abs_time); template<class Rep, class Period> unique_lock(mutex_type& m, const chrono::duration<Rep, Period>& rel_time); ~unique_lock();
unique_lock(const unique_lock&) = delete; unique_lock& operator=(const unique_lock&) = delete;
unique_lock(unique_lock&& u) noexcept; unique_lock& operator=(unique_lock&& u) noexcept; // [thread.lock.unique.locking], lockingvoid lock(); bool try_lock(); template<class Rep, class Period>bool try_lock_for(const chrono::duration<Rep, Period>& rel_time); template<class Clock, class Duration>bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time); void unlock(); // [thread.lock.unique.mod], modifiersvoid swap(unique_lock& u) noexcept; mutex_type* release() noexcept; // [thread.lock.unique.obs], observersbool owns_lock() const noexcept; explicit operator bool() const noexcept; mutex_type* mutex() const noexcept; private: mutex_type* pm; // exposition onlybool owns; // exposition only};}
An object of type unique_lock controls the ownership of a lockable object within a scope.
Ownership of the lockable object may be acquired at construction or after construction, and may be transferred, after acquisition, to another unique_lock object.
Objects of type unique_lock are not copyable but are movable.
The behavior of a program is undefined if the contained pointerpm is not null and the lockable object pointed to by pm does not exist for the entire remaining lifetime ([basic.life]) of the unique_lock object.
The suppliedMutex type shall meet the Cpp17BasicLockable requirements ([thread.req.lockable.basic]).
[Note 1:
unique_lock meets the Cpp17BasicLockable requirements.
If Mutex meets the Cpp17Lockable requirements ([thread.req.lockable.req]),unique_lock also meets the Cpp17Lockable requirements; if Mutex meets the Cpp17TimedLockable requirements ([thread.req.lockable.timed]),unique_lock also meets the Cpp17TimedLockable requirements.
â end note]