std::jthread::get_stop_source
来自 cppreference.com
| std::stop_source get_stop_source() noexcept; |
(自 C++20 起) | |
返回一个与 jthread 对象内部持有的共享停止状态关联的 std::stop_source。
[编辑] 参数
(无)
[编辑] 返回值
一个与 jthread 对象内部持有的停止状态关联的 std::stop_source 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> 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); }
可能的输出
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
