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。
参数
(无)
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。
示例
运行此代码
#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'; }; // 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