Can't figure out where is std::this_thread
for jthread
?
I have a function that theoretically makes a jthread
sleep until a cancellation is requested:
template<typename Rep, typename Period>
void sleep_for(const std::chrono::duration<Rep, Period>& d, const std::stop_token& token)
{
std::condition_variable cv;
std::mutex mutex;
std::unique_lock<std::mutex> lock{ mutex };
std::stop_callback stop_wait{ token, [&cv]()
{
cv.notify_one(); }
};
cv.wait_for(lock, d, [&token]()
{
return token.stop_requested();
});
}
How do I call it on jthread
?
Theoretically the program below exits within 1 second:
int main()
{
std::jthread t([]()
{
//where do I get `stop_token`?
sleep_for(std::chrono::seconds(5), std::this_jthread::get_stop_token());
});
std::this_thread::sleep_for(std::chrono::seconds(1));
t.request_stop();
return 0;
}
The jthread constructor accepts a function that takes a std::stop_token as its first argument, which will be passed in by the jthread from its internal stop_source.
Here is an example:
std::jthread t([](std::stop_token stop_token)
{
while(!stop_token.stop_requested()) {
//Process data...
std::this_thread::sleep_for(std::chrono::seconds(5));
}
});
std::this_thread::sleep_for(std::chrono::seconds(1));
t.request_stop();
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