cppreference.com 创建账户 std::condition_variable 在标头<condition_variable>定义 classcondition_variable; (C++11 起) std::condition_variable是与std::mutex一起使用的同步原语,它能用于阻塞一个线程,或同时阻塞多个线程,直至另一线程修改共享变量(条件)并通知std::condition_variable。
std::condition_variable_any:: template<classLock> voidwait(Lock&lock); (1)(C++11 起) template<classLock,classPredicate> voidwait(Lock&lock, Predicate pred); (2)(C++11 起) template<classLock,classPredicate> boolwait(Lock&lock,std::stop_tokenstoken, Predicate pred);...
cppreference 给出的官方解释: A condition variable is an object able to block the calling thread until notified to resume. It uses a unique_lock (over a mutex) to lock the thread when one of its wait functions is called. The thread remains blocked until woken up by another thread that ...
namespacestd{classcondition_variable;classcondition_variable_any;voidnotify_all_at_thread_exit(condition_variable&cond, unique_lock<mutex>lk);enumclasscv_status{no_timeout, timeout};} Classstd::condition_variable namespacestd{classcondition_variable{public:condition_variable();~condition_variable();co...
condition_variable cv;//线程A,producervoidtask1(){inti =0;while(true) {unique_lock<mutex>lock(mtx);if(q.size() <1000) {if(i <99) { q.push_back(i); cv.notify_one();//cv.notify_all();i++; }else{ i =0; } }else{ ...
c++ condition_variable的wait 语法糖 最近在复盘之前用到的线程同步的一些知识点,话不多说,先看个例子吧: 摘自:http://www.cplusplus.com/reference/condition_variable/condition_variable/wait/ //condition_variable::wait (with predicate)#include <iostream>//std::cout#include <thread>//std::thread, std...
我对std::condition_variable的使用有点困惑。我知道在调用mutex之前,我必须在unique_lockcondition_variable.wait()。我找不到的是在调用notify_one()或notify_all()之前是否也应该获取唯一锁。 cppreference.com上的示例相互矛盾。例如,notify_one 页面给出了这个例子: ...
From cppreference.com <cpp |thread |condition variable C++ native_handle_type native_handle(); (since C++11) Accesses the native handle of*this. The meaning and the type of the result of this function is implementation-defined. On a POSIX system, this may be a value of typepthread...
for (auto& th : threads) th.join(); return 0; } // reference: http://en.cppreference.com/w/cpp/thread/condition_variable std::mutex m; std::condition_variable cv6; std::string data; bool ready6 = false; bool processed = false; static void worker_thread() { // Wait until main...
但是每一次循环总是要判断(轮询)很费时间,为了简化这种写法,且加快程序执行效率,C++引入了条件变量的类:std::condition_varible。cppreference对此的描述是:Condition variable A condition variable is an object able to block the calling thread until notified to resume. It uses a unique_lock (over a mutex...