TCP Winsock: accept multiple connections/clients

Question

I tried to can multiply clients, and send it to each one. But it working only for one, after one client connected the server just useless for incoming connections.

Answer 1

Of course new clients cannot be accepted because the server handles just accepted client, i.e. the server is busy.

The solution is simple: create a new thread for each accepted client and handle the client session there. Just use _beginthreadex() (#include ):

unsigned __stdcall ClientSession(void *data)
{
    SOCKET client_socket = (SOCKET)data;
    // Process the client.
}

int _tmain(int argc, _TCHAR* argv[])
{
    ...

    SOCKET client_socket;
    while ((client_socket = accept(server_socket, NULL, NULL))) {
        // Create a new thread for the accepted client (also pass the accepted client socket).
        unsigned threadID;
        HANDLE hThread = (HANDLE)_beginthreadex(NULL, 0, &ClientSession, (void*)client_socket, 0, &threadID);
    }
}

By the way, send()/recv() functions do not guarantee that all the data would be sent/received at one call. Please see the documentation for return value of these functions.