std::jthread::get_stop_source
来自cppreference.com
std::stop_source get_stop_source()noexcept; | (C++20 起) | |
返回 std::stop_source，它与 jthread 对象内部所保有者相同的共享停止状态关联。
[编辑]参数
（无）
[编辑]返回值
与 jthread 对象内部保有的共享停止状态关联的 std::stop_source 类型的值。
[编辑]示例
运行此代码
#include <chrono>#include <condition_variable>#include <iostream>#include <mutex>#include <string_view>#include <thread> usingnamespace std::chrono_literals; int main(){std::cout<<std::boolalpha;auto print =[](std::string_view name, conststd::stop_source& source){std::cout<< name <<": stop_possible = "<< source.stop_possible();std::cout<<", stop_requested = "<< source.stop_requested()<<'\n';}; // 工作线程auto worker =std::jthread([](std::stop_token stoken){for(int i =10; i;--i){std::this_thread::sleep_for(300ms);if(stoken.stop_requested()){std::cout<<" 困倦工人已被请求停止\n";return;}std::cout<<" 困倦工人回去睡觉\n";}}); std::stop_source stop_source = worker.get_stop_source(); print("stop_source", stop_source); std::cout<<"\n将信号源传递给其他线程：\n";auto stopper =std::thread([](std::stop_source source){std::this_thread::sleep_for(500ms);std::cout<<"通过信号源请求工人停止\n"; source.request_stop();}, stop_source); stopper.join();std::this_thread::sleep_for(200ms);std::cout<<'\n'; print("stop_source", stop_source);}
可能的输出：
stop_source: stop_possible = true, stop_requested = false 将信号源传递给其他线程： 困倦工人回去睡觉 通过信号源请求工人停止 困倦工人已被请求停止 stop_source: stop_possible = true, stop_requested = true
