std::jthread::get_stop_source
From cppreference.com
| std::stop_source get_stop_source() noexcept; |
(C++20以降) | |
jthread オブジェクトが内部で保持している共有停止状態と同じ共有停止状態に関連付けられた std::stop_source を返します。
[編集] パラメータ
(なし)
[編集] 戻り値
jthread オブジェクトが内部で保持している停止状態に関連付けられた、std::stop_source 型の値。
[編集] 例
このコードを実行
#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); }
実行結果の例
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
