std::jthread::get_stop_source
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std::jthread
Member functions
Observers
Operations
Stop token handling
jthread::get_stop_source
Non-member functions
std::stop_source get_stop_source() noexcept;
(since C++20)
Returns a std::stop_source associated with the same shared stop-state as held internally by the jthread object.
[edit] Parameters
(none)
[edit] Return value
A value of type std::stop_source associated with stop-state held internally by jthread object.
[edit] Example
Run this code
#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); }
Possible output:
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