How to free the memory occupied by window??

["Bin Chen" <binary chen gmail com>]

Hi,

A strange problem that I can't free the memory allocated for window, I
take the example in notebook.c, it is in examples directory, and add
some profile function in it, the result shows:

--------------------------------
binch    24287  0.0  0.4  11624  4348 pts/0    S+   16:49   0:00 ./notebook
binch    24289  0.0  0.0   1656   464 pts/0    S+   16:49   0:00 sh -c
ps aux|grep notebook
binch    24291  0.0  0.0   2812   760 pts/0    S+   16:49   0:00 grep notebook
--------------------------------
binch    24287  0.0  0.4  11624  4348 pts/0    S+   16:49   0:00 ./notebook
binch    24293  0.0  0.0   1656   464 pts/0    S+   16:49   0:00 sh -c
ps aux|grep notebook
binch    24295  0.0  0.0   1656   244 pts/0    R+   16:49   0:00 sh -c
ps aux|grep notebook
--------------------------------
binch    24287  0.0  0.5  12800  6140 pts/0    S+   16:49   0:00 ./notebook
binch    24297  0.0  0.0   1656   464 pts/0    S+   16:49   0:00 sh -c
ps aux|grep notebook
binch    24299  0.0  0.0   2808   760 pts/0    S+   16:49   0:00 grep notebook
--------------------------------
binch    24287  0.0  0.5  12800  6168 pts/0    S+   16:49   0:00 ./notebook
binch    24301  0.0  0.0   1660   468 pts/0    S+   16:49   0:00 sh -c
ps aux|grep notebook
binch    24303  0.0  0.0   2812   756 pts/0    R+   16:49   0:00 grep notebook

The memory get to 12800 after I run gtk_widget_show(), but after the
gtk_widget_destroy(), the memory still at 12800 (see last two case).

Whats wrong here?

Thanks.
Bin

PS: I attach the modified notebook.c here.

#include <stdio.h>
#include <gtk/gtk.h>

/* This function rotates the position of the tabs */
static void rotate_book( GtkButton   *button,
                         GtkNotebook *notebook )
{
    gtk_notebook_set_tab_pos (notebook, (notebook->tab_pos + 1) % 4);
}

/* Add/Remove the page tabs and the borders */
static void tabsborder_book( GtkButton   *button,
                             GtkNotebook *notebook )
{
    gint tval = FALSE;
    gint bval = FALSE;
    if (notebook->show_tabs == 0)
            tval = TRUE;
    if (notebook->show_border == 0)
            bval = TRUE;

    gtk_notebook_set_show_tabs (notebook, tval);
    gtk_notebook_set_show_border (notebook, bval);
}

/* Remove a page from the notebook */
static void remove_book( GtkButton   *button,
                         GtkNotebook *notebook )
{
    gint page;

    page = gtk_notebook_get_current_page (notebook);
    gtk_notebook_remove_page (notebook, page);
    /* Need to refresh the widget --
     This forces the widget to redraw itself. */
    gtk_widget_queue_draw (GTK_WIDGET (notebook));
}

static gboolean delete( GtkWidget *widget,
                        GtkWidget *event,
                        gpointer   data )
{
    gtk_main_quit ();
    return FALSE;
}

int main( int argc,
          char *argv[] )
{
    GtkWidget *window;
    GtkWidget *button;
    GtkWidget *table;
    GtkWidget *notebook;
    GtkWidget *frame;
    GtkWidget *label;
    GtkWidget *checkbutton;
    int i;
    char bufferf[32];
    char bufferl[32];

    gtk_init (&argc, &argv);

    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

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

    gtk_container_set_border_width (GTK_CONTAINER (window), 10);

    table = gtk_table_new (3, 6, FALSE);
    gtk_container_add (GTK_CONTAINER (window), table);

    /* Create a new notebook, place the position of the tabs */
    notebook = gtk_notebook_new ();
    gtk_notebook_set_tab_pos (GTK_NOTEBOOK (notebook), GTK_POS_TOP);
    gtk_table_attach_defaults (GTK_TABLE (table), notebook, 0, 6, 0, 1);
    gtk_widget_show (notebook);

    /* Let's append a bunch of pages to the notebook */
    for (i = 0; i < 5; i++) {
        sprintf(bufferf, "Append Frame %d", i + 1);
        sprintf(bufferl, "Page %d", i + 1);
        
        frame = gtk_frame_new (bufferf);
        gtk_container_set_border_width (GTK_CONTAINER (frame), 10);
        gtk_widget_set_size_request (frame, 100, 75);
        gtk_widget_show (frame);
        
        label = gtk_label_new (bufferf);
        gtk_container_add (GTK_CONTAINER (frame), label);
        gtk_widget_show (label);
        
        label = gtk_label_new (bufferl);
        gtk_notebook_append_page (GTK_NOTEBOOK (notebook), frame, label);
    }

    /* Now let's add a page to a specific spot */
    checkbutton = gtk_check_button_new_with_label ("Check me please!");
    gtk_widget_set_size_request (checkbutton, 100, 75);
    gtk_widget_show (checkbutton);

    label = gtk_label_new ("Add page");
    gtk_notebook_insert_page (GTK_NOTEBOOK (notebook), checkbutton, label, 2);

    /* Now finally let's prepend pages to the notebook */
    for (i = 0; i < 5; i++) {
        sprintf (bufferf, "Prepend Frame %d", i + 1);
        sprintf (bufferl, "PPage %d", i + 1);
        
        frame = gtk_frame_new (bufferf);
        gtk_container_set_border_width (GTK_CONTAINER (frame), 10);
        gtk_widget_set_size_request (frame, 100, 75);
        gtk_widget_show (frame);
        
        label = gtk_label_new (bufferf);
        gtk_container_add (GTK_CONTAINER (frame), label);
        gtk_widget_show (label);
        
        label = gtk_label_new (bufferl);
        gtk_notebook_prepend_page (GTK_NOTEBOOK (notebook), frame, label);
    }

    /* Set what page to start at (page 4) */
    gtk_notebook_set_current_page (GTK_NOTEBOOK (notebook), 3);

    /* Create a bunch of buttons */
    button = gtk_button_new_with_label ("close");
    g_signal_connect_swapped (G_OBJECT (button), "clicked",
                              G_CALLBACK (delete), NULL);
    gtk_table_attach_defaults (GTK_TABLE (table), button, 0, 1, 1, 2);
    gtk_widget_show (button);

    button = gtk_button_new_with_label ("next page");
    g_signal_connect_swapped (G_OBJECT (button), "clicked",
                              G_CALLBACK (gtk_notebook_next_page),
                              G_OBJECT (notebook));
    gtk_table_attach_defaults (GTK_TABLE (table), button, 1, 2, 1, 2);
    gtk_widget_show (button);

    button = gtk_button_new_with_label ("prev page");
    g_signal_connect_swapped (G_OBJECT (button), "clicked",
                              G_CALLBACK (gtk_notebook_prev_page),
                              G_OBJECT (notebook));
    gtk_table_attach_defaults (GTK_TABLE (table), button, 2, 3, 1, 2);
    gtk_widget_show (button);

    button = gtk_button_new_with_label ("tab position");
    g_signal_connect (G_OBJECT (button), "clicked",
                      G_CALLBACK (rotate_book),
                      (gpointer) notebook);
    gtk_table_attach_defaults (GTK_TABLE (table), button, 3, 4, 1, 2);
    gtk_widget_show (button);

    button = gtk_button_new_with_label ("tabs/border on/off");
    g_signal_connect (G_OBJECT (button), "clicked",
                      G_CALLBACK (tabsborder_book),
                      (gpointer) notebook);
    gtk_table_attach_defaults (GTK_TABLE (table), button, 4, 5, 1, 2);
    gtk_widget_show (button);

    button = gtk_button_new_with_label ("remove page");
    g_signal_connect (G_OBJECT (button), "clicked",
                      G_CALLBACK (remove_book),
                      (gpointer) notebook);
    gtk_table_attach_defaults (GTK_TABLE (table), button, 5, 6, 1, 2);
    gtk_widget_show (button);

    system("echo --------------------------------");
    system("ps aux|grep notebook");
    gtk_widget_show (table);
    system("echo --------------------------------");
    system("ps aux|grep notebook");
    gtk_widget_show (window);
    system("echo --------------------------------");
    system("ps aux|grep notebook");
    gtk_widget_destroy(window);
    system("echo --------------------------------");
    system("ps aux|grep notebook");

    gtk_main ();

    return 0;
}