A problem about programming with Gtk+

Dear Gnome.
     I got a  prablem about programming in Gtk+. The  following program creat a 'Button'.But
there is a  problem with the 'static void callback( GtkWidget *widget, gpointer   data )'.
In this part of the program ,i want to change the cursor before the program executing the for-loop.
Here is the  problem.In this program ,it always execute the for-loop first and then change the
cursor.I do not understand what happen. Could you tell what's  wrong with  my program and how to
fix it.Thanks.


#include <unistd.h>
#include <stdlib.h>
#include <gtk/gtk.h>
#include <pthread.h>
/* Create a new hbox with an image and a label packed into it
 * and return the box. */
static GtkWidget *xpm_label_box( gchar     *xpm_filename,
                                 gchar     *label_text )
    GtkWidget *box;
    GtkWidget *label;
    GtkWidget *image;
    /* Create box for image and label */
    box = gtk_hbox_new (FALSE, 0);
    gtk_container_set_border_width (GTK_CONTAINER (box), 2);

    /* Now on to the image stuff */
    image = gtk_image_new_from_file (xpm_filename);

    /* Create a label for the button */
    label = gtk_label_new (label_text);

    /* Pack the image and label into the box */
    gtk_box_pack_start (GTK_BOX (box), image, FALSE, FALSE, 3);
    gtk_box_pack_start (GTK_BOX (box), label, FALSE, FALSE, 3);

    gtk_widget_show (image);
    gtk_widget_show (label);

    return box;
static int cursor_change(gpointer data_pass)
      GtkWidget *window = (GtkWidget *) data_pass;
      GThread *gthread;
      g_thread_set_priority(gthread, G_THREAD_PRIORITY_URGENT);
 //Set   A   Cursor
 GdkCursor  *new_cursor;
        g_print ("I make it!");
 gdk_window_set_cursor(window->window, new_cursor);
      return 0;
/* Our usual callback function */
static void callback( GtkWidget *widget, gpointer   data )
    gint   ptimer;
     ptimer=g_timeout_add(1, (GtkFunction)cursor_change, data);
    //ptimer=gdk_threads_add_timeout(100, (GtkFunction)cursor_change, data);
    int i,j;
     g_print ("Hello again - %s was pressed %d\n", (char *) data,i);
    GdkCursor  *renew_cursor;
     gdk_window_set_cursor(window->window, renew_cursor);
     gdk_cursor_destroy(renew_cursor);* */
int main( int   argc,   char *argv[] )
    /* GtkWidget is the storage type for widgets */
    GtkWidget *window;
    GtkWidget *button;
    GtkWidget *box;

    gtk_init (&argc, &argv);
  /*   // set foreground color is different from color key
    GdkColor color;
    GdkColormap *map;

    memset(&color, 0, sizeof(color));
    color.blue = 10000;
    map = gdk_colormap_get_system();
    gdk_color_alloc(map, &color);
    gdk_gc_set_foreground(window->style->black_gc, &color);




    /* Create a new window */
    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

    gtk_window_set_title (GTK_WINDOW (window), "Pixmap'd Buttons!");

    /* It's a good idea to do this for all windows. */
    g_signal_connect (G_OBJECT (window), "destroy",
               G_CALLBACK (gtk_main_quit), NULL);

    g_signal_connect (G_OBJECT (window), "delete_event",
         G_CALLBACK (gtk_main_quit), NULL);


 /* Sets the border width of the window. */
    gtk_container_set_border_width (GTK_CONTAINER (window), 10);

    /* Create a new button */
   button = gtk_button_new ();

    /* Connect the "clicked" signal of the button to our callback */
 g_signal_connect (G_OBJECT (button), "clicked",  G_CALLBACK (callback), (gpointer) window);

    /* This calls our box creating function */
   box = xpm_label_box ("info.xpm", "cool button");

    /* Pack and show all our widgets */
   gtk_widget_show (box);

   gtk_container_add (GTK_CONTAINER (button), box);

   gtk_widget_show (button);

   gtk_container_add (GTK_CONTAINER (window), button);

    gtk_widget_show (window);



    /* Rest in gtk_main and wait for the fun to begin! */
    gtk_main ();

    return 0;


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