c++多线程——模拟售票

最新推荐文章于 2024-08-21 11:22:24 发布

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最新推荐文章于 2024-08-21 11:22:24 发布

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本文探讨了使用Windows API实现并发线程间的互斥操作，通过创建线程和互斥对象，确保多线程环境下资源的安全访问，具体展示了线程1和线程2如何在共享资源的情况下进行同步与竞争。

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

 using namespace std;
DWORD WINAPI Fun1Proc(LPVOID lpParameter);//thread data
DWORD WINAPI Fun2Proc(LPVOID lpParameter);//thread data
 
int index=0;
int tickets=10;
HANDLE hMutex;
void main()
{
    HANDLE hThread1;
    HANDLE hThread2;
    //创建线程
 
    hThread1=CreateThread(NULL,0,Fun1Proc,NULL,0,NULL);
    hThread2=CreateThread(NULL,0,Fun2Proc,NULL,0,NULL);
    CloseHandle(hThread1);
    CloseHandle(hThread2);
 
    //创建互斥对象
    hMutex=CreateMutex(NULL,TRUE,(LPCWSTR)"tickets");
    if (hMutex)
    {
        if (ERROR_ALREADY_EXISTS==GetLastError())
        {
            cout<<"only one instance can run!"<<endl;
            return;
        }
    }
    WaitForSingleObject(hMutex,INFINITE);
    ReleaseMutex(hMutex);
    ReleaseMutex(hMutex);
     
    Sleep(4000);
}
//线程1的入口函数
DWORD WINAPI Fun1Proc(LPVOID lpParameter)//thread data
{
    while (true)
    {
        ReleaseMutex(hMutex);
        WaitForSingleObject(hMutex,INFINITE);
        if (tickets>0)
        {
            Sleep(1);
            cout<<"thread1 sell ticket :"<<tickets--<<endl;
        }
        else
            break;
        ReleaseMutex(hMutex);
    }
 
    return 0;
}
//线程2的入口函数
DWORD WINAPI Fun2Proc(LPVOID lpParameter)//thread data
{
    while (true)
    {
        ReleaseMutex(hMutex);
        WaitForSingleObject(hMutex,INFINITE);
        if (tickets>0)
        {
            Sleep(1);
            cout<<"thread2 sell ticket :"<<tickets--<<endl;
        }
        else
            break;
        ReleaseMutex(hMutex);
    }
     
    return 0;
}