--避免长时间持锁：及时释放，防止性能瓶颈 --考虑用std::shared_mutex替代std::mutex：在读多写少场景下性能更优 理解共享锁，就是理解"共享"与"独占"的平衡艺术。要像图书馆一样，既要保证书籍的共享利用，又要确保管理维护的专属时间。PS：这里用到的CAS操作，其实就像图书馆的"查验入场券"系统，确保每个人都
}unsignedreaders()const{returnstate&MAX_READERS;}public:voidlock(){std::unique_lock<std::mutex>l...
而lock_guard、unique_lock可以理解为独占锁,只允许一个线程对资源进行写操作。 在一些只读函数中可以用std::shared_mutex,而在写操作函数中需用std::unique_lock。 std::shared_mutex是c++17中引入的,不支持std::mutex,需用std::shared_mutex声明互斥信号量。 std::lock_guard (c++11): 单个std::mutex(或std...
the type of the shared mutex to lock. The type must meet the SharedMutex requirements 成员类型 Type Definition mutex_type Mutex 成员函数 (constructor) constructs a shared_lock, optionally locking the supplied mutex (public member function)
std::shared_lock<Mutex>::shared_lockshared_lock() noexcept; (1) (since C++14) shared_lock( shared_lock&& other ) noexcept; (2) (since C++14) explicit shared_lock( mutex_type& m ); (3) (since C++14) shared_lock( mutex_type& m, std::defer_lock_t t ) noexcept; (4) (...
The class shared_lock is a general-purpose shared mutex ownership wrapper allowing deferred locking, timed locking and transfer of lock ownership. Locking a shared_lock locks the associated shared mutex in shared mode (to lock it in exclusive mode, std::unique_lock can be used) ...
std::shared_lock<Mutex>::shared_lock: std::shared_lock<Mutex>::shared_lockCommand to display std::shared_lock<Mutex>::shared_lock manual in Linux: $ man 3 std::shared_lock<Mutex>::shared_lock NAMEstd::shared_lock<Mutex>::shared_lock - std::shared_lock<Mutex>::shared_lock ...
std::mutex std::recursive_mutex std::shared_mutex std::timed_mutex std::recursive_timed_mutex std::scoped_lock std::unique_lock std::defer_lock_t, std::try_to_lock_t, std::adopt_lock_t std::lock std::try_lock std::defer_lock, std::try_to_lock, std::adopt_lock std::once_fla...
EN如果我放置一个互斥锁来同步对数据的所有访问，性能可能不会更好，因为大多数读者只需要读取单个缓冲区...
shared_lock(mutex_type&m, conststd::chrono::duration<Rep,Period>&timeout_duration); (7)(since C++14) template<classClock,classDuration> shared_lock(mutex_type&m, conststd::chrono::time_point<Clock,Duration>&timeout_time); (8)(since C++14) ...