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能与std::shared_lock一同使用,以在std::shared_mutex上以共享所有权模式等待。 std::condition_variable_any与自定义可锁定(Lockable)类型的一种可能用法,是提供便利的可中断等待:自定义的锁定操作按预期锁定关联的互斥体,并进行必要的设置,以在收到中断信号时通知此条件变量。[1] ...
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...
() have associated with the condition variable during their waits; however, if predictable scheduling behaviour is required, then that mutex is locked by the thread calling pthread_cond_signal() or pthread_cond_broadcast(). std::condition_variable - cppreference.com Acquire a std::mutex (...
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{ ...
condition_variable_any::wait_for condition_variable_any::wait_untilvoid notify_all() noexcept; (since C++11) Unblocks all threads currently waiting for *this. Parameters(none) Return value(none) NotesThe effects of notify_one()/notify_all() and each of the three atomic parts of wait()/wa...
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: ...
示例修改自:http://en.cppreference.com/w/... 首先是头文件: #include <iostream> #include <string> #include <thread> #include <mutex> #include <condition_variable> 然后是两个线程共享的全局变量: std::mutex mutex; std::condition_variable cv; ...