std::jthread::get_stop_token
来自cppreference.com
std::stop_token get_stop_token() const noexcept; |
(C++20 起) | |
返回 std::stop_token,它与 jthread
对象内部保有的同一共享停止状态关联。
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_token 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; void 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'; } void finite_sleepy(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"; } } void infinite_sleepy() { for (int i = 5; i; --i) { std::this_thread::sleep_for(300ms); std::cout << " 按要求持续运行\n"; } } int main() { std::cout << std::boolalpha; // 监听停止请求的工作线程 std::jthread stop_worker(finite_sleepy); // 仅在完成时停止的工作线程 std::jthread inf_worker(infinite_sleepy); 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 << "\n请求并接合 stop_worker:\n"; stop_worker.request_stop(); stop_worker.join(); std::cout << "\n请求并接合 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); }
可能的输出:
def_token : stop_possible = false, stop_requested = false stop_token: stop_possible = true, stop_requested = false inf_token : stop_possible = true, stop_requested = false 请求并接合: 按要求持续运行 困倦工人已被请求停止 请求并接合: 按要求持续运行 按要求持续运行 按要求持续运行 按要求持续运行 def_token : stop_possible = false, stop_requested = false stop_token: stop_possible = true, stop_requested = true inf_token : stop_possible = true, stop_requested = true