巩固C++(二)----多线程编程

1 C++11 多线程编程

先来一个例子：

#include<iostream>
#include<vector>
#include<stdlib.h>
#include<thread>
#include<windows.h>

using std::cout;
using std::endl;
using namespace std::this_thread;
using std::thread;
using std::vector;

void print(int n)
{
	//打印的顺序是一定的，且完整度也会受到影响
	cout << "线程编号：" << get_id() << "\tn = " << n << endl;
}


int main()
{
	//返回硬件线程上下文的估计的静态方法，自己定义多线程时，最好是其整数倍
	int thdNo = thread::hardware_concurrency();
	cout << "My Thread is " << thdNo << endl;

	vector<thread *> vec;

	for (int i = 0; i < thdNo * 2 - 1; i++)
	{
		//建立多线程的过程,其实线程也是有优先级的
		vec.push_back(new thread(print, i));		
	}

	for (auto it : vec)
	{
		//加入多线程
		it->join();
	}

	system("pause");
	return 0;
}

运行结果：

My Thread is 8
线程编号：线程编号：5336        n = 4
线程编号：7172  n = 9
线程编号：8736  n = 6
线程编号：7808  n = 10
线程编号：8756  n = 3
线程编号：7272  n = 7
线程编号：5348  n = 11
线程编号：6112  n = 2
线程编号：8568  n = 5
线程编号：8200  n = 12
线程编号：6860  n = 8
7016    n = 0
线程编号：6448  n = 14
线程编号：7844  n = 1
线程编号：8500  n = 13
请按任意键继续. . .

待续....