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std::stop_token:: stop_requested

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std::stop_token
bool stop_requested ( ) const noexcept ;
(C++20 이후)

stop_token 객체가 연결된 중지 상태를 가지고 있고 해당 상태에서 중지 요청을 받았는지 확인합니다. 기본 생성된 stop_token 은 연결된 중지 상태가 없으므로 중지가 요청되지 않았습니다.

매개변수

(없음)

반환값

true 만약 stop_token 객체가 연결된 중지 상태를 가지고 있고 중지 요청을 수신한 경우, false 그렇지 않은 경우.

예제

이 코드 실행 
#include <chrono>
#include <condition_variable>
#include <iostream>
#include <mutex>
#include <string_view>
#include <thread>
using namespace std::chrono_literals;
int main()
{
    std::cout << std::boolalpha;
    auto print = [](std::string_view name, const std::stop_token& token)
    {
        std::cout << name << ": stop_possible = " << token.stop_possible();
        std::cout << ", stop_requested = " << token.stop_requested() << '\n';
    };
    // 정지 요청을 수신할 작업자 스레드
    auto stop_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 << "  Sleepy worker is requested to stop\n";
                return;
            }
            std::cout << "  Sleepy worker goes back to sleep\n";
        }
    });
    // 완료될 때만 정지하는 작업자 스레드
    auto inf_worker = std::jthread([]()
    {
        for (int i = 5; i; --i)
        {
            std::this_thread::sleep_for(300ms);
            std::cout << "  Run as long as we want\n";
        }
    });
    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 << "\nRequest and join stop_worker:\n";
    stop_worker.request_stop();
    stop_worker.join();
    std::cout << "\nRequest and join 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);
}

가능한 출력: 

def_token : stop_possible = false, stop_requested = false
stop_token: stop_possible = true, stop_requested = false
inf_token : stop_possible = true, stop_requested = false
Request and join stop_worker:
  Run as long as we want
  Sleepy worker is requested to stop
Request and join inf_worker:
  Run as long as we want
  Run as long as we want
  Run as long as we want
  Run as long as we want
def_token : stop_possible = false, stop_requested = false
stop_token: stop_possible = true, stop_requested = true
inf_token : stop_possible = true, stop_requested = true