信号量示例-MFC信号量类CSemaphore

#include <afxmt.h>
CSemaphore g_cs(2, 2);

UINT ThreadProcFirst(LPVOID pParam);
UINT ThreadProcSecond(LPVOID pParam);
UINT ThreadProcThird(LPVOID pParam);

void CMfcSemaphoreDlg::OnButton1()
{
    AfxBeginThread(ThreadProcFirst, NULL);
    AfxBeginThread(ThreadProcSecond, NULL);
    AfxBeginThread(ThreadProcThird, NULL);    
}

UINT ThreadProcFirst( LPVOID pParam )
{
    g_cs.Lock();
    AfxMessageBox("First");
    g_cs.Unlock();
    return 0;
}

UINT ThreadProcSecond( LPVOID pParam )
{
    g_cs.Lock();
    AfxMessageBox("Second");
    g_cs.Unlock();
    return 0;
}

UINT ThreadProcThird( LPVOID pParam )
{
    g_cs.Lock();
    AfxMessageBox("Third");
    g_cs.Unlock();
    return 0;
}