#include

 

多線程初級

 

#include <iostream>
#include <thread>
#include <windows.h>
#include <mutex>

//兩個線程並行訪問一個變量

int g_num = 20;//找到或者找不到的標識
std::mutex g_mutex;

void goA(int num)
{
    g_mutex.lock();//你訪問的變量，在你訪問期間，別人訪問不了

    for (int i = 0; i < 15; i++)
    {
        Sleep(300);
        g_num = 10;//修改全局變量
        std::cout << "線程" << num << "   " << g_num << std::endl;
    }

    g_mutex.unlock();//解鎖
}

void goB(int num)
{
    for (int i = 0; i < 15; i++)
    {
        Sleep(500);
        g_num = 11;//修改全局變量
        std::cout << "線程" << num << "   " << g_num << std::endl;
    }
}

void main()
{
    std::thread t1(goA, 1);
    std::thread t2(goB, 2);
    t1.join();
    t2.join();

    std::cin.get();
}