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std unique lock
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The class unique_lock is a general-purpose mutex ownership wrapper allowing deferred locking, time-constrained attempts at locking, recursive locking, transfer of lock ownership, and use with condition variables.. The class unique_lock is movable, but not copyable -- it meets the requirements of MoveConstructible and MoveAssignable but not of CopyConstructible or CopyAssignable.
std::unique_lock holds a lock on a separate std::mutex object. You associate the lock object with the mutex by passing it in the constructor. Unless you specify otherwise, the mutex will be immediately locked. If the lock object holds the lock when it is destroyed then the destructor will release the lock.
Conclusion. In conclusion, both std::unique_lock and std::lock_guard are powerful tools provided by the C++ standard library for managing mutexes and ensuring thread safety. std::lock_guard offers a simple, efficient way to lock and unlock a mutex within a scope, making it ideal for straightforward locking needs.Choosing between them depends on the specific requirements of your code.
A unique lock is an object that manages a mutex object with unique ownership in both states: locked and unlocked. On construction (or by move-assigning to it), the object acquires a mutex object, for whose locking and unlocking operations becomes responsible. The object supports both states: locked and unlocked. This class guarantees an unlocked status on destruction (even if not called ...
7) 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.
Constructs a unique_lock: (1) default constructor The object manages no mutex object. (2) locking initialization The object manages m, and locks it (blocking, if necessary) by calling m.lock(). (3) try-locking initialization The object manages m, and attempts to lock it (without blocking) by calling m.try_lock(). (4) deferred initialization
tries to lock (i.e., takes ownership of) the associated TimedLockable mutex, returns if the mutex has been unavailable until specified time point has been reached (public member function)
The class unique_lock is a general-purpose mutex ownership wrapper allowing deferred locking, time-constrained attempts at locking, recursive locking, transfer of lock ownership, and use with condition variables.. The class unique_lock is movable, but not copyable -- it meets the requirements of MoveConstructible and MoveAssignable but not of CopyConstructible or CopyAssignable.
The class unique_lock is a general-purpose mutex ownership wrapper allowing deferred locking, time-constrained attempts at locking, recursive locking, transfer of lock ownership, and use with condition variables.. The class unique_lock is movable, but not copyable -- it meets the requirements of MoveConstructible and MoveAssignable but not of CopyConstructible or CopyAssignable.
The following example uses lock to re-acquire a mutex that was unlocked.