MFC学习 事件临界区

事件:

#include <Windows.h>

#include <iostream>

DWORD WINAPI Func1Pro(LPVOID lpParameter);

DWORD WINAPI Func2Pro(LPVOID lpParameter);

int tickets = 100;

HANDLE g_hEvent;

void main()

{



    HANDLE hThread1;

    HANDLE hThread2;

    hThread1 = CreateThread(NULL, 0, Func1Pro, NULL, 0, NULL);

    hThread2 = CreateThread(NULL, 0, Func2Pro, NULL, 0, NULL);

    CloseHandle(hThread1);

    CloseHandle(hThread2);

//    g_hEvent = CreateEvent(NULL, TRUE, FALSE, NULL); //人工重置的事件对象, 初始信号状态设置为无信号状态

    //g_hEvent = CreateEvent(NULL, FALSE, FALSE, NULL); //自动重置事件对象, 初始信号状态设置为无信号状态

    g_hEvent = CreateEvent(NULL, FALSE, FALSE, "tickets"); 

    if(g_hEvent)

    {

        //带名字的事件对象也是系统唯一的, 可以判断实例

        if(ERROR_ALREADY_EXISTS == GetLastError())

        {

            std::cout<< "only instance can run!" << std::endl;

            return;

        }

    }

    SetEvent(g_hEvent);//人工重置的事件对象, 会将所有线程的事件信号状态都改变 ResetEvent改成无信号

    Sleep(4000);

    CloseHandle(g_hEvent);

}

DWORD WINAPI Func1Pro(LPVOID lpParameter)

{



    while(TRUE)

    {

        WaitForSingleObject(g_hEvent, INFINITE); //如果是自动重置事件对象 处理时, 会改成非信号状态

        if(tickets > 0)

        {

            Sleep(1);

            std::cout << "thread1 sell ticket: " << tickets-- << std::endl;

        }

        else

            break;

        SetEvent(g_hEvent); //再设置为有信号状态

    }

    return 0;

}

DWORD WINAPI Func2Pro(LPVOID lpParameter)

{



    while(TRUE)

    {

        WaitForSingleObject(g_hEvent, INFINITE);//如果是自动重置事件对象 处理时, 会改成非信号状态

        if(tickets > 0)

        {

            Sleep(1);

            std::cout << "thread2 sell ticket: " << tickets-- << std::endl;

        }

        else

            break;

        SetEvent(g_hEvent); //再设置为有信号状态

    }

    return 0;

}

临界区:

#include <Windows.h>

#include <iostream>

DWORD WINAPI Func1Pro(LPVOID lpParameter);

DWORD WINAPI Func2Pro(LPVOID lpParameter);

int tickets = 100;

CRITICAL_SECTION g_cs;

void main()

{



    HANDLE hThread1;

    HANDLE hThread2;

    hThread1 = CreateThread(NULL, 0, Func1Pro, NULL, 0, NULL);

    hThread2 = CreateThread(NULL, 0, Func2Pro, NULL, 0, NULL);

    CloseHandle(hThread1);

    CloseHandle(hThread2);

    InitializeCriticalSection(&g_cs); //初始化临界区对象

    Sleep(4000);

    DeleteCriticalSection(&g_cs);

}

DWORD WINAPI Func1Pro(LPVOID lpParameter)

{



    while(TRUE)

    {

        EnterCriticalSection(&g_cs); //检查是否能进入临界区

        if(tickets > 0)

        {

            Sleep(1);

            std::cout << "thread1 sell ticket: " << tickets-- << std::endl;

        }

        else

            break;

        LeaveCriticalSection(&g_cs);

        

    }

    return 0;

}

DWORD WINAPI Func2Pro(LPVOID lpParameter)

{



    while(TRUE)

    {

        EnterCriticalSection(&g_cs);

        if(tickets > 0)

        {

            Sleep(1);

            std::cout << "thread2 sell ticket: " << tickets-- << std::endl;

        }

        else

            break;

        LeaveCriticalSection(&g_cs);

    }

    return 0;

}

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