60 lines
1.3 KiB
C++
60 lines
1.3 KiB
C++
#include <future>
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#include <iostream>
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#include <thread>
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#ifdef _WIN32
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#include <windows.h>
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#endif
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// 1.Promise(生产者)和Future(消费者)
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void workTh1(std::promise<int> prom)
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{
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std::this_thread::sleep_for(std::chrono::seconds(5));
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prom.set_value(98);
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}
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void testTaskTh1()
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{
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std::promise<int> prm;
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auto fut = prm.get_future();
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std::thread t(workTh1, std::move(prm));
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std::cout << "准备打印内容..." << std::endl;
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std::cout << fut.get() << std::endl;
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std::cout << "打印内容结束..." << std::endl;
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t.join();
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}
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// 2.std::packaged_task本质上是一个包装器, 包装可调用对象，内部使用了std::promise.
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int someFunc(int a, int b)
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{
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std::this_thread::sleep_for(std::chrono::seconds(3));
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return a + b;
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}
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void testTaskTh2()
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{
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std::packaged_task<int(int, int)> pt(someFunc);
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auto fut = pt.get_future();
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std::thread t(std::move(pt), 33, 55);
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t.join();
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std::cout << __FUNCTION__ << " over, ret = " << fut.get() << std::endl;
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}
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// 3.异步运行任务（更高级的用法，不用关心开线程打包这种操作）
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void testTaskTh3()
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{
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auto fut = std::async(std::launch::async, someFunc, 11, 22);
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std::cout << __FUNCTION__ << " over, ret = " << fut.get() << std::endl;
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}
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int main()
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{
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#ifdef _WIN32
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SetConsoleOutputCP(CP_UTF8);
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#endif
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testTaskTh3();
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return 0;
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} |