//start main function


    HANDLE hSemaphore, hThread;



    //create semaphore


    hSemaphore = CreateSemaphore (NULL, // default security

    attributes


     2, // initial count


     2, //maximum count


     NULL); // object name


    if (hSemaphore == NULL)



    {


     printf ("Error creating the semaphore\n");


     exit (1);


    }


    //create child threads


    for (i=0; i<3; i++)


    {


     hThread=CreateThread(NULL,0,foo,(LPVOID)i,0,&dwThreadID);




     if (hThread)


     printf ("Thread launched successfully\n");


     else


     //print error message and exit (-1)


    }



    //wait until child threads have exited


    DWORD dwCThd = WaitForMultipleObjects (3, //count of

    objects


     hThread, //thread handle


     TRUE, //wait for all


     INFINITE); //time out interval


    If (dwCThd != WAIT_OBJECT_0)


     //Print error message and exit (-1)



    //close handle for semaphore


    CloseHandle (hSemaphore);


    //close child thread handles


    for (i=0; i<3; i++)


     CloseHandle (hThread[i]);


    //end of main function



    /******


    * function foo


    ******/


    DWORD WINAPI foo (LPVOID num)


    {


     for( j = 0; j<3; j++)


     {


     //wait for single object


     DWORD dwRes = WaitForSingleObject (hSemaphore,

    INFINITE);


     If (dwRes == WAIT_OBJECT_0)


     //acquired the semaphore


     else


     //print error


     // do something


     // release semaphore


     Long lpPreviousCount;


     ReleaseSemaphore (hSemaphore,


     1, // count of the semaphore object


     // is to be increased
&lpPreviousCount); //pointer to a 32-bit

    variable


     // for the previous count of


     // the semaphore


     Sleep (1000);


     }


     return 0;


    }