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std::jthread::get_stop_source

來自 cppreference.com
< cpp‎ | thread‎ | jthread
 
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std::jthread
 
std::stop_source get_stop_source() noexcept;
 (C++20 起)

返回一個與 `jthread` 物件內部持有的相同共享停止狀態關聯的 std::stop_source。

[編輯] 引數

(無)

[編輯] 返回值

一個 std::stop_source 型別的值，與 `jthread` 物件內部持有的停止狀態相關聯。

[編輯] 示例

執行此程式碼
#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_source& source)
    {
        std::cout << name << ": stop_possible = " << source.stop_possible();
        std::cout << ", stop_requested = " << source.stop_requested() << '\n';
    };
 
    // A worker thread
    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 << "  Sleepy worker is requested to stop\n";
                return;
            }
            std::cout << "  Sleepy worker goes back to sleep\n";
        }
    });
 
    std::stop_source stop_source = worker.get_stop_source();
    print("stop_source", stop_source);
 
    std::cout << "\nPass source to other thread:\n";
    auto stopper = std::thread(
        [](std::stop_source source)
        {
            std::this_thread::sleep_for(500ms);
            std::cout << "Request stop for worker via source\n";
            source.request_stop();
        },
        stop_source);
    stopper.join();
    std::this_thread::sleep_for(200ms);
    std::cout << '\n';
 
    print("stop_source", stop_source);
}

可能的輸出

stop_source: stop_possible = true, stop_requested = false
 
Pass source to other thread:
  Sleepy worker goes back to sleep
Request stop for worker via source
  Sleepy worker is requested to stop
 
stop_source: stop_possible = true, stop_requested = true
取自“https://cppreference.tw/mwiki/index.php?title=cpp/thread/jthread/get_stop_source&oldid=161151”