std::jthread::get_stop_token
来自cppreference.com
std::stop_token get_stop_token()constnoexcept; | (C++20 起) | |
返回 std::stop_token，它与 jthread 对象内部保有的同一共享停止状态关联。
[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_token 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; void print(std::string_view name, conststd::stop_token& token){std::cout<< name <<": stop_possible = "<< token.stop_possible();std::cout<<", stop_requested = "<< token.stop_requested()<<'\n';} void finite_sleepy(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";}} void infinite_sleepy(){for(int i =5; i;--i){std::this_thread::sleep_for(300ms);std::cout<<" 按要求持续运行\n";}} int main(){std::cout<<std::boolalpha; // 监听停止请求的工作线程std::jthread stop_worker(finite_sleepy); // 仅在完成时停止的工作线程std::jthread inf_worker(infinite_sleepy); std::stop_token def_token;std::stop_token stop_token = stop_worker.get_stop_token();std::stop_token inf_token = inf_worker.get_stop_token(); print("def_token ", def_token); print("stop_token", stop_token); print("inf_token ", inf_token); std::cout<<"\n请求并接合 stop_worker:\n"; stop_worker.request_stop(); stop_worker.join(); std::cout<<"\n请求并接合 inf_worker:\n"; inf_worker.request_stop(); inf_worker.join();std::cout<<'\n'; print("def_token ", def_token); print("stop_token", stop_token); print("inf_token ", inf_token);}
可能的输出：
def_token : stop_possible = false, stop_requested = false stop_token: stop_possible = true, stop_requested = false inf_token : stop_possible = true, stop_requested = false 请求并接合: 按要求持续运行 困倦工人已被请求停止 请求并接合: 按要求持续运行 按要求持续运行 按要求持续运行 按要求持续运行 def_token : stop_possible = false, stop_requested = false stop_token: stop_possible = true, stop_requested = true inf_token : stop_possible = true, stop_requested = true
