c++ 多线程

例子一

#include <iostream>   
#include <windows.h>   
using namespace std;

DWORD WINAPI Fun(LPVOID lpParamter)
{
    for (int i = 0; i < 10; i++)
        cout << "A ！" << endl;
    return 0L;
}

int main()
{
    HANDLE hThread = CreateThread(NULL, 0, Fun, NULL, 0, NULL);
    CloseHandle(hThread);
    for (int i = 0; i < 10; i++)
        cout << "Main！" << endl;
    return 0;
}

输出：

Main！
A ！Main！

Main！A ！

Main！A ！

Main！A ！

Main！A ！

A ！Main！

A ！
Main！A ！

A ！Main！

A ！Main！

例子二：

#include <stdlib.h>
#include <iostream>
#include <list>
#include <conio.h>
#include <time.h>
#include <algorithm>
#include <windows.h>
//头文件引用较多, 有一些与本程序无关
 
/*
HANDLE WINAPI CreateThread(
    LPSECURITY_ATTRIBUTES   lpThreadAttributes, //线程安全相关的属性，常置为NULL
    SIZE_T                  dwStackSize,        //新线程的初始化栈在大小，可设置为0
    LPTHREAD_START_ROUTINE  lpStartAddress,     //被线程执行的回调函数，也称为线程函数
    LPVOID                  lpParameter,        //传入线程函数的参数，不需传递参数时为NULL
    DWORD                   dwCreationFlags,    //控制线程创建的标志
    LPDWORD                 lpThreadId          //传出参数，用于获得线程ID，如果为NULL则不返回线程ID
);
*/
 
using namespace std;
 
volatile int b = 0;
 
DWORD WINAPI ThreadProc(LPVOID lpParameter)
{
    int i = 10000;
    int *p = (int*)lpParameter;
    while(i--)
    {
        (*p)++;
        b++;
    }
 
    return 0;
}
 
int main(int argc, char* argv[])
{
    int a = 0;
 
    HANDLE hThread1 = CreateThread(NULL, 0, ThreadProc, &a, 0, NULL);
    HANDLE hThread2 = CreateThread(NULL, 0, ThreadProc, &a, 0, NULL);
    HANDLE hThread3 = CreateThread(NULL, 0, ThreadProc, &a, 0, NULL);
    HANDLE hThread4 = CreateThread(NULL, 0, ThreadProc, &a, 0, NULL);
    HANDLE hThread5 = CreateThread(NULL, 0, ThreadProc, &a, 0, NULL);
 
    Sleep(1000);
 
    CloseHandle(hThread1);
    CloseHandle(hThread2);
    CloseHandle(hThread3);
    CloseHandle(hThread4);
    CloseHandle(hThread5);
 
    cout << "a = " << a << endl;
    cout << "b = " << b << endl;
 
    system("pause");
    return 0;
}

输出：

a = 42900
b = 44220