CPU Usage 100% when creating 3 threads and using WSAWaitForMultipleEvents() and WSAEnumNetworkEvents()

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C

Windows

threads

programming

UDP

, +

I have created 3 threads each thread has one socket each. Inside each thread, socket is made "Event Driven" and whenever data becomes available for reading, an event is generated.

The code works fine but it takes CPU Usage upto 100% which is surely undesirable. I think I have made some mistake. Below is my code. Please help me in figuring out what mistake have I made that results in 100% CPU Usage.

Code:

DWORD WINAPI ThreadProc(LPVOID param)
{
   int threadNumber= (int)param;
   int PORT = 8888+threadNumber; //so that each thread bind()s its socket to a different Port number.
   WSADATA wsa; 

   //Initialise winsock//
   if (WSAStartup(MAKEWORD(2,2),&wsa) != 0)
      {

        //"WinSock Initialization FAILED",

      }

   //Create a socket//

  SOCKET newSocketIdentifier;
  SOCKADDR_IN newSocket;

  if((newSocketIdentifier = socket(AF_INET , SOCK_DGRAM , 0 )) == INVALID_SOCKET)
      {                 

        //Socket Creation Failed

      }
   //Socket Created//

   //Prepare the sockaddr_in structure//
  newSocket.sin_family = AF_INET;
  newSocket.sin_addr.s_addr = INADDR_ANY;
  newSocket.sin_port = htons(PORT);

   //Bind//
   if( bind(newSocketIdentifier ,(struct sockaddr *)&newSocket, sizeof(SOCKADDR_IN)) == SOCKET_ERROR)
      { 
       //Bind Failed
      }

   //Bind Done//
char data[256];
int bytes, waitRet;

WSAEVENT hEvent = WSACreateEvent();
WSANETWORKEVENTS events;
WSAEventSelect(newSocketIdentifier, hEvent, FD_READ | FD_WRITE);

   while(1)
      {
         waitRet = WSAWaitForMultipleEvents(2, &hEvent, FALSE, WSA_INFINITE, FALSE);
         if(WSAEnumNetworkEvents(newSocketIdentifier,hEvent,&events) == SOCKET_ERROR)
            //Error
         else
            {
               if(events.lNetworkEvents & FD_READ)
                  {
                      //call recvfrom()
                  }
            }
      }

    WSACloseEvent(hEvent);
   return 0;
}

int WINAPI WinMain( HINSTANCE hInst, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd )
{

   HANDLE threadHandle[3];
   int max_number=3;
   //Start the threads
   for (int i = 0; i < max_number; i++) 
   {

    threadHandle[i]= CreateThread( NULL,
                                       0,
                                       ThreadProc,
                                       (LPVOID) i,
                                       0,
                                       NULL
                                 );
   }

return 0;
}