C++中的std::async如何为？
摘要：一、实例代码 问题 无论std::async调用了多少次，只额外单启动了一个线程，并且串行执行！待解惑 #include<iostream> #include<thread&
一、实例代码
问题 无论std::async调用了多少次，只额外单启动了一个线程，并且串行执行！待解惑
#include<iostream>
#include<thread>
#include <chrono>
#include <future>
//锁
static std::mutex s_mutex;
static void sleepMine(int i) {
std::thread::id threadId = std::this_thread::get_id();
//std::lock_guard<std::mutex> loock(s_mutex);
std::cout << threadId << " Hello world" << i << " start." << std::endl;
std::this_thread::sleep_for(std::chrono::seconds(i));
std::cout << threadId << " Hello world" << i << " end." << std::endl;
}
int main() {
/*for (int i = 1; i <= 5; i++) {
std::thread::id threadId = std::this_thread::get_id();
std::cout << threadId << " Main " << i << " end." << std::endl;
std::async(std::launch::async, sleepMine, i);
}*/
std::async(std::launch::deferred, sleepMine, 1).get();
std::async(std::launch::deferred, sleepMine, 2).get();
std::async(std::launch::deferred, sleepMine, 3).get();
std::cin.get();
}