mutablestd::mutex mut;//必须是mutable,因为empty是const方法,但是要锁mut,锁操作就是改变操作std::queue<T> data_queue;std::condition_variable data_cond; public: threadsave_queue(){} threadsave_queue(threadsave_queueconst& other){std:
mutable std::mutex mtx; // 保护实例变量的互斥量,mutable 允许在 const 方法中锁定 B* bInstance = nullptr; // 指向 B 的指针 }; } // namespace vslam #endif // A_H A.cpp 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 #include "A.h" ...
mutable std::mutex mutex_; std::atomic<int> use_count_{0}; bool to_be_deleted_{false}; }; class Logger { // ... 其他成员 SharedResource* shared_resource_; public: ~Logger() { shared_resource_->markForDeletion(); } // ... 其他方法 }; 2. 显式关闭信号 cpp #include <mutex> ...
void reset() { std::unique_lock lock(mutex_); value_ = 0; }private: mutable std::shared_mutex mutex_; unsigned int value_{};};int main(){ ThreadSafeCounter counter; auto increment_and_print = [&counter]() { for (int i = 0; i < 3; ++i) { counter.increment(); std::osync...
mutable std::mutex m; // 互斥量 mutable bool rootsAreValid { false }; mutable RootsType rootVals {}; }; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 使用原子变量(Atomic) 对于仅涉及单个变量或内存位置的操作,可以使用std::atomic来替代互斥量,以减少同步开销。
互斥锁使用std::mutex类;条件变量使用std::condition_variable类;自旋锁通过C++11的std::atomic类实现,使用“自旋”的CAS操作。 自旋锁参考:C++11实现自旋锁 #include <thread> #include <mutex> #include <iostream> #include <atomic> #include <condition_variable> ...
std::vector<EndpointFactoryPtr> _factories; mutable std::mutex _mutex; }; Expand Down 5 changes: 0 additions & 5 deletions 5 cpp/src/Ice/Instance.cpp Show comments View file Edit file Delete file Open in desktop This file contains bidirectional Unicode text that may be interpreted or ...
mutable std::mutex tasks_mutex_; /// A condition variable for worker threads. mutable std::condition_variable tasks_condition_; /// A condition variable to support waitForEmptyQueue(). mutable std::condition_variable wait_condition_; /// A counter of active threads unsigned active_threads_; ...
多线程读写同一变量需要使用同步机制,最常见的同步机制就是std::mutex和std::atomic。然而从性能角度看,通常使用std::atomic会获得更好的性能. C++11 提供6 种可以应用于原子变量的内存次序: momory_order_relaxed, memory_order_consume, memory_order_acquire, memory_order_release, memory_order_acq_rel, mem...
mutex( const mutex& ) = delete;`⿇蛋!~⽽std::vector和std::map都是要求类型必须包含拷贝构造函数的，所以就报错了。且即时添加mutable关键字,也⽆效的.最简单的⽅法就是 :把std::mutex _mutex ;改成std::shared_ptr<std::mutex> _mutex 就可以了 使⽤的时候 std::lock_guard<std::mutex> ...