thread

[grisch]

Hi
I wanna program a client/server-app. Each client should start an own thread on the server.

I've tried already something, but it doesnt work properly. I got some problems with this "_beginthread"-function.

   Socket s;
   SOCKET* newConnection = 0;

   while(1)
   {
      newConnection = s.acceptConnection();
      Service myService(newConnection);

      _beginthread((void (*)(void *))myService.start(), 0, (void * newConnection);
    
   }

Any better ideas ?


Thanks
Flavio

[billwilson3]

I'm suprised it even compiles. Your 1st and second arguments look pretty screwed up.

_beginthread((void (*)(void *))myService.start(), 0, (void * newConnection);


What is (void (*)(void *))myService.start(), supposed to mean?

What is this supposed to do? (void * newConnection

What error do you get?

Try looking at the example in MSDN. It is very different from your code.

[grisch]

ok i've given a look at msdn and i coded it with the "CreateThread"-function. It works fine now, but i've still a problem:

I can compile it, but i cant link it. there's a problem with the parameter "newConnection" which I wanna give to the thread-function:

well, here's the code:

DWORD WINAPI myThread(LPVOID);

I guess, LPVOID is wrong, but when I try with SOCKET* (which is my parameter I wanna pass) it doesnt work too.

void
main()
{

   DWORD dwThreadId[100];
   HANDLE hThread[100]; 
   int i = 0;


   while(1)
   {
        Socket s;
        SOCKET* newConnection = 0;
        newConnection = s.acceptConnection();

      
        hThread[i] = CreateThread( 
        NULL,                          // default security attributes 
        0,                                // use default stack size  
        myThread,                  // thread function 
        newConnection,         // argument to thread function 
        0,                               // use default creation flags 
        &dwThreadId[i]);       // returns the thread identifier 

        i++;
        Sleep(100);
   }



DWORD WINAPI myThread(SOCKET* newConnection)
{

   Service myService(newConnection);
   return EXIT_SUCCESS;
}

ok, thanks very much

Flavio

[lichtf]

You do want to use the LPVOID. Inside your myThread function you will have to use a cast to get the parameter to the variable type that you want.

For example

DWORD WINAPI myThread(LPVOID newConnection){
Service myService((SOCKET*)newConnection);
   return EXIT_SUCCESS;
}

I hope this helps somewhat.