Создание потока в оконном приложении - C (СИ)

#include <windows.h>
 
const char g_szClassName[] = "myWindowClass";
// Step 4: the Window Procedure
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch(msg) {
    case WM_CLOSE:
        DestroyWindow(hwnd);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd, msg, wParam, lParam);
    }
    return 0;
}
 
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine, int nCmdShow)
{
    WNDCLASSEX wc;
    HWND hwnd;
    MSG Msg;
 
    //Step 1: Registering the Window Class
    wc.cbSize        = sizeof(WNDCLASSEX);
    wc.style         = 0;
    wc.lpfnWndProc   = WndProc;
    wc.cbClsExtra    = 0;
    wc.cbWndExtra    = 0;
    wc.hInstance     = hInstance;
    wc.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
    wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    wc.lpszMenuName  = NULL;
    wc.lpszClassName = g_szClassName;
    wc.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);
 
    if(!RegisterClassEx(&wc)) {
        MessageBox(NULL, "Window Registration Failed!", "Error!",
                   MB_ICONEXCLAMATION | MB_OK);
        return 0;
    }
 
    // Step 2: Creating the Window
    hwnd = CreateWindowEx(
               WS_EX_CLIENTEDGE,
               g_szClassName,
               "The title of my window",
               WS_OVERLAPPEDWINDOW,
               CW_USEDEFAULT, CW_USEDEFAULT, 240, 120,
               NULL, NULL, hInstance, NULL);
 
    if(hwnd == NULL) {
        MessageBox(NULL, "Window Creation Failed!", "Error!",
                   MB_ICONEXCLAMATION | MB_OK);
        return 0;
    }
 
    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);
 
    // Step 3: The Message Loop
    while(GetMessage(&Msg, NULL, 0, 0) > 0) {
        TranslateMessage(&Msg);
        DispatchMessage(&Msg);
    }
    return Msg.wParam;
}