刷野打怪上王者·C++篇·第22期·多线程处理

参考链接

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多线程处理

    在电脑中可以进行多任务处理，其中多任务的处理方式分为两种：多进程和多线程。多进程是程序的并发执行；多线程是同一程序判断并发执行。

实例程序

#include <iostream>
#include <utility>
#include <thread>
#include <chrono>
#include <functional>
#include <atomic>

void f1(int n) 
{
	for (int i = 0; i < 5; ++i) {
		std::cout << "Thread " << n << " executing\n";
		std::this_thread::sleep_for(std::chrono::milliseconds(10)); //线程休眠一段时间
	}
}

void f2(int& n)
{
	for (int i = 0; i < 5; ++i) {
		std::cout << "Thread 2 executing\n";
		++n;
		std::this_thread::sleep_for(std::chrono::milliseconds(10)); //线程休眠一段时间
	}
}

int main()
{
	int iPara = 0;
	std::thread thread1;             // thread1不是线程
	std::thread thread2(f1, iPara + 1); // 想函数内传递iPara + 1
	std::thread thread3(f2, std::ref(iPara)); // 通过参考的方式传递值
	std::thread thread4(std::move(thread3)); // thread4现在运行f2. thread3不在是线程
	thread2.join();
	thread4.join();
	std::cout << "Final value of n is " << iPara << '\n';
	getchar();
}

运行结果

Thread Thread 2 executing
1 executing
Thread 1Thread 2 executing
 executing
Thread 2 executing
Thread 1 executing
Thread 2 executing
Thread 1 executing
Thread 2 executing
Thread 1 executing
Final value of n is 5

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