在这个例子中,Counter类的对象由std::shared_ptr管理,并在多个线程中共享,在thread_func函数中,每次调用counter->increment()前,都用std::lock_guard<std::mutex>锁定mtx,保证每次访问increment()是原子操作,std::lock_guard是RAII风格的锁管理器,它会在代码块结束时自动释放锁。启动 10 个线程,每个线程对共享计...
<< std::endl; } private: std::string strData="测试数据"; bool valid; // 用于检查对象是否有效 void read() { auto self = shared_from_this(); //这可以延长this的声明周期 //auto self =this; // 这样会有问题 std::thread([self]() { std::this_thread::sleep_for(std::chrono::second...
std::shared_ptr<int> ptr = std::make_shared<int>(42); std::thread t1(worker, std::ref(ptr)); std::thread t2(worker, std::ref(ptr)); t1.join(); t2.join(); return 0; } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 在这个...
线程执行完毕后,main()函数将打印global_instance(std::shared_ptr对象)的值。 #include <iostream> #include <memory> #include <thread> #include <chrono> #include <mutex> #include <vector> std::shared_ptr<int> global_instance = std::make_shared<int>(0); std::mutex m; constexpr int max_l...
std::shared_ptr<Dog> pd; void F() { pd = std::make_shared<Dog>("Smokey"); } int main() { std::thread t1(F); std::thread t2(F); t1.join(); t2.join(); return 0; } Run Code Online (Sandbox Code Playgroud) std::shared_ptr<Dog> pd(new Dog("Gunner")); void F()...
std::shared_ptr<Base> lp = p; // thread-safe, even though the // shared use_count is incremented { static std::mutex io_mutex; std::lock_guard<std::mutex> lk(io_mutex); print("Local pointer in a thread:", lp); } }
std::unique_ptr<std::thread> thread_; //指向定义函数 threadCapture_.reset(new std::thread([this]() { func(); } )); #功能函数 void func() { while(1) { std::chrono::system_clock::time_point now = std::chrono::system_clock::now(); //compute std::chrono::system_clock::...
{ std::shared_ptr<Counter> counter = std::make_shared<Counter>(); std::thread t1([&]() { for (int i = 0; i < 1000; ++i) { counter->increment(); } }); std::thread t2([&]() { for (int i = 0; i < 1000; ++i) { counter->...
std::cout <<"local pointer in a thread:\n" <<" lp.get() = "<< lp.get() <<", lp.use_count() = "<< lp.use_count() <<'\n'; } } intmain() { //使用make_shared一次分配好需要内存 std::shared_ptr<Test> p = std::make_shared<Test>(); ...
一个最朴素的想法是,使用智能指针管理节点。事实上,如果平台支持std::atomic_is_lock_free(&some_shared_ptr)实现返回true,那么所有内存回收问题就都迎刃而解了(我在X86和Arm平台测试,均返回false)。示例代码(文件命名为lock_free_stack.h)如下: #pragmaonce#include#includetemplate<typenameT>classLockFreeStack{...