std::jthread::get_stop_token - cppreference.com (original) (raw)

Returns a std::stop_token associated with the same shared stop-state held internally by the jthread object.

[edit] Parameters

(none)

[edit] Return value

A value of type std::stop_token associated with stop-state held internally by jthread object.

[edit] Example

#include #include #include #include #include #include   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 << " Sleepy worker is requested to stop\n"; return; }   std::cout << " Sleepy worker goes back to sleep\n"; } }   void infinite_sleepy() { for (int i = 5; i; --i) { std::this_thread::sleep_for(300ms); std::cout << " Run as long as we want\n"; } }     int main() { std::cout << std::boolalpha;   // A worker thread that will listen to stop requests std::jthread stop_worker(finite_sleepy);   // A worker thread that will only stop when completed 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 << "\nRequest and join stop_worker:\n"; stop_worker.request_stop(); stop_worker.join();   std::cout << "\nRequest and join 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); }

Possible output:

def_token : stop_possible = false, stop_requested = false stop_token: stop_possible = true, stop_requested = false inf_token : stop_possible = true, stop_requested = false   Request and join stop_worker: Run as long as we want Sleepy worker is requested to stop   Request and join inf_worker: Run as long as we want Run as long as we want Run as long as we want Run as long as we want   def_token : stop_possible = false, stop_requested = false stop_token: stop_possible = true, stop_requested = true inf_token : stop_possible = true, stop_requested = true