stduniquelockstdsharedmutex

std::unique_lock is a class template in the C++ Standard Library that provides a convenient and exception-safe mechanism for managing mutex ownership. It is defined in the <mutex> header file. std::unique_lock is a move-only type, meaning that it cannot be copied but can be moved. This makes it suitable for use in scenarios where ownership of a mutex needs to be transferred between different scopes or functions.

The primary purpose of std::unique_lock is to ensure that a mutex is properly locked and unlocked, even in the presence of exceptions. When a std::unique_lock object is created, it attempts to lock the associated mutex. If the lock is successful, the mutex is considered owned by the std::unique_lock object. When the std::unique_lock object is destroyed, it automatically unlocks the mutex, ensuring that the mutex is always released.

std::unique_lock provides several member functions for managing the mutex, including lock, try_lock, unlock, and swap. It also provides a member function called owns_lock, which can be used to check whether the std::unique_lock object currently owns the mutex.

std::unique_lock is typically used in conjunction with std::mutex and other synchronization primitives to protect shared data from concurrent access. It is particularly useful in situations where the scope of the lock needs to be explicitly controlled, such as when working with condition variables or when performing complex operations that require multiple locks.