C++ wait_for
2022/8/9 1:22:49
本文主要是介绍C++ wait_for,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
#include <iostream> #include <future> int mythread() { std::cout << "mythread " << std::this_thread::get_id() << std::endl; std::chrono::milliseconds second(3000); std::this_thread::sleep_for(second); return 5; } int main() { std::cout << "main " << std::this_thread::get_id() << std::endl; std::future<int> ret = std::async(std::launch::async, mythread); std::future_status status = ret.wait_for(std::chrono::seconds(2)); switch(status) { case std::future_status::timeout: std::cout << "timeout" << std::endl; break; case std::future_status::ready: std::cout << "ready" << std::endl; break; case std::future_status::deferred: std::cout << "deferred" << std::endl; break; default: break; } std::cout << "future " << ret.get() << std::endl; std::cout << "end" << std::endl; return 0; }
$ g++ wait_for.cpp -std=c++11 -pthread
$ ./a.out main 140534331926336 mythread 140534314587904 timeout future 5 end
std::future_status status = ret.wait_for(std::chrono::seconds(4));
$ ./a.out main 140365530023744 mythread 140365512685312 ready future 5 end
std::future<int> ret = std::async(std::launch::deferred, mythread);
$ ./a.out main 140412357789504 deferred mythread 140412357789504 future 5 end
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