std::recursive_timed_mutex:递归定时mutex类 lock类(两种): std::lock_guard:与mutex RAII 相关,方便线程对互斥量上锁 std::unique_lock:与mutex RAII相关,方便线程对互斥量上锁,但提供了更好的上锁和解锁控制 其他类型: std::once_flag std::adopt_lock_t std::defer_lock_t std::try_to_lock_t 函数...
2.timed_mutex:提供了等待超时的机制:try_lock() try_lock_for(时间)//防止线程阻塞try_lock_until()//等一个时间点now+second(5); 3.shared_lock unique_lock shared_mutex读写锁 用法: shared_mutex s; class w_r { private: queue<char> message; public: void mywrite(); void myread(); }; ...
#include <iostream>#include <mutex>#include <shared_mutex>#include <thread>std::shared_mutex sh_mtx;int shared_data = 0;void read_data() {std::shared_lock<std::shared_mutex> lock(sh_mtx);std::cout << "Read shared_data: " << shared_data << std::endl;}void write_data() {std:...
boost::shared_mutex mutex; int count = 0; void Counter() { boost::upgrade_lock<boost::shared_mutex> lock(mutex); boost::upgrade_to_unique_lock<boost::shared_mutex> uniquelock(lock); int i = ++count; std::cout << "count == " << i << std::endl; } int main() { boost::thr...
Mutextemplate<class _Mutex > typedef _Mutex cv::utils::shared_lock_guard< _Mutex >::Mutex Constructor & Destructor Documentation shared_lock_guard()template<class _Mutex > cv::utils::shared_lock_guard< _Mutex >::shared_lock_guard ( Mutex & m ) inlineexplicit ~shared_lock_guard()template...
lock_guard 对象通常用于管理某个锁(Lock)对象,因此与 Mutex RAII 相关,方便线程对互斥量上锁,即在某个 lock_guard 对象的声明周期内,它所管理的锁对象会一直保持上锁状态;而 lock_guard 的生命周期结束之后,它所管理的锁对象会被解锁(注:类似 shared_ptr 等智能指针管理动态分配的内存资源 )。
#include <thread> std::mutex mtx; void shared_print(const std::string& str) { std::lock_guard<std::mutex> lock(mtx); std::cout << str << std::endl; } int main() { std::thread t1(shared_print, "Hello from thread 1"); std::thread t2(shared_print, "Hello from thread 2")...
voidshared_print(string msg,intid){std::unique_lock<std::mutex>guard(_mu, std::defer_lock);//do something 1guard.lock();// do something protectedguard.unlock();//临时解锁//do something 2guard.lock();//继续上锁// do something 3f << msg << id << endl; ...
在上述示例中,std::unique_lock<std::mutex> 对象lock 用于锁定互斥量 mutex,以保护对 sharedVariable 共享变量的访问。increment 函数在互斥访问的范围内对 sharedVariable 进行递增操作。两个线程通过调用 increment 函数并发地修改共享变量,但由于互斥量的保护,保证了线程安全性。 请注意,与 std::lock_guard 相比...
#include <iostream> #include <thread> #include <mutex> #include <vector> std::mutex mtx; // 全局互斥锁 int shared_data = 0; // 共享数据 void increment(int id) { for (int i = 0; i < 1000; ++i) { std::lock_guard<std::mutex> lock(mt...