具体来说,可以使用std::condition_variable和std::mutex来实现线程的暂停和恢复。 首先,需要定义一个std::condition_variable对象和一个std::mutex对象,用于线程之间的同步和通信。然后,在父线程中,可以通过调用std::condition_variable的wait()函数来暂停子线程的执行。wait()函数会使当
std::condition_variable voidwait(std::unique_lock<std::mutex>&lock); (1)(C++11 起) template<classPredicate> voidwait(std::unique_lock<std::mutex>&lock, Predicate pred); (2)(C++11 起) wait导致当前线程阻塞直至条件变量被通知,或虚假唤醒发生。可以提供pred以检测虚假唤醒。
在C++中,<mutex> 是一个标准库头文件,它包含了 std::mutex 类,这是一个互斥锁库。要在C++代码中包含这个库,你需要在文件的开头添加以下代码: 代码语言:cpp 复制 #include <mutex> 在C++中,<condition_variable> 是一个标准库头文件,它包含了 std::condition_variable 类,这是一个条件变量库。要在C++代码...
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...
Any thread that intends to wait on astd::condition_variablemust: Acquire astd::unique_lock<std::mutex>on the mutex used to protect the shared variable. Do one of the following: Check the condition, in case it was already updated and notified. ...
#pragma once #include<thread> #include<condition_variable> #include<atomic> namespace AsyncSystem { class Event { public: Event() { _set = false; } bool wait() { while (!_set) { std::unique_lock<std::mutex> lock(_mutex); if (!_set) { _cond.wait(lock); // 这里应该是把锁让...
如果你用到了条件变量 std::condition_variable::wait 则必须使用 std::unique_lock 作为参数。 例如: #include<iostream> #include<thread> intv=1; voidcritical_section(intchange_v) { staticstd::mutexmtx; std::unique_lock<std::mutex>lock(mtx); ...
Looking information on std::condition_variable I found the following example on https://en.cppreference.com/w/cpp/thread/condition_variable: void worker_thread() { : : // Manual unlocking is done before notifying, to avoid waking up // the waiting thread only to block again (see notify_...
1.foo()阻塞等待bar()线程通知改变其所等待的条件变量 2.bar()在等foo()解锁std::mutex,以改变条件状态flag 总结 那么如何封装条件变量呢,可以参考C++11标准库的接口设计,将mutex放出来,在wait的时候当参数传入:https://en.cppreference.com/w/cpp/thread/condition_variable/wait,这里不多赘述了。
#include <chrono>#include <condition_variable>#include <iostream>#include <thread>usingnamespacestd::chrono_literals;std::condition_variablecv;std::mutexcv_m;inti=0;booldone=false;voidwaits(){std::unique_lock<std::mutex>lk(cv_m);std::cout<<"Waiting...\n";cv.wait(lk,[]{returni==1;...