Re: GtkListStore and Threads problems

[Lorena Salinas <lsalinas invap com ar>]

Here is a test that I've run using gdb and had the following error:

Gtk-ERROR **: file gtksequence.c: line 760
(_gtk_sequence_node_find_by_pos): assertion failed: (node->parent !=
NULL)
aborting...

any help?


Regards,
Lorena



#include <gtk/gtk.h>
#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

#define STATUS_NORMAL 1

enum
{
TEST_COL_0 = 0,
TEST_COL_1, 
TEST_COL_2, 
TEST_COL_3, 
TEST_COL_4, 
TEST_COL_5, 
TEST_COL_6,
TEST_COL_7, 
TEST_NUM_COLS
} ;

pthread_mutex_t mutex;
GtkTreeModel * model;
gboolean bTerminated;  /* Variable que controla el loop dentro del
thread */


gboolean upgrade_status (void)
{
static gboolean upgrading = FALSE;
GtkTreeIter iter;
gboolean valid;
int status;

g_assert (model);

if (upgrading) {
g_print("WARNING: Upgrading!!!\n");
return FALSE;
}

upgrading = TRUE;


pthread_mutex_lock(&mutex);
gdk_threads_enter(); /* get GTK thread lock */

valid = gtk_tree_model_get_iter_first (GTK_TREE_MODEL (model), &iter);

gdk_threads_leave(); /* release GTK thread lock */
pthread_mutex_unlock(&mutex);


while (valid) {

gtk_tree_model_get (GTK_TREE_MODEL (model), &iter,
TEST_COL_5,    &status,

-1);


pthread_mutex_lock(&mutex);
gdk_threads_enter(); /* get GTK thread lock */
gtk_list_store_set (GTK_LIST_STORE (model), &iter,
TEST_COL_5, g_random_int_range(0,100),
-1);
gdk_threads_leave(); /* release GTK thread lock */
pthread_mutex_unlock(&mutex);


valid = gtk_tree_model_iter_next (GTK_TREE_MODEL (model), &iter);

} /* while valid */


upgrading = FALSE;

return TRUE;

}

void *connectThread(void *data){

bTerminated = 0;

while (!bTerminated){

upgrade_status();
sleep(1);

} /* end while (!bTerminated) */
g_print ("pthread_exit(NULL)\n");
pthread_exit(NULL);
}

void create_thread (void)
{

pthread_t testThread; 

gint res;

if ( gtk_tree_model_iter_n_children (model, NULL) > 0) {

res = pthread_create (&testThread , NULL, &connectThread, NULL);

if (res > 0) {

fprintf (stderr, "Error al crear thread");

} 
}

} /* create_thread */ 


static GtkTreeModel *create_and_fill_model (void)
{

GtkTreeIter iter;

GtkListStore *store;

guint i;



store = gtk_list_store_new (TEST_NUM_COLS, 
G_TYPE_INT,   
G_TYPE_INT,   
G_TYPE_INT,   
G_TYPE_INT,   
G_TYPE_INT,   
G_TYPE_INT,   
G_TYPE_INT,   
G_TYPE_INT   

);     


for (i=1; i <= 100; i++){

gtk_list_store_append (store, &iter);
gtk_list_store_set (store, &iter,
TEST_COL_0, i,
TEST_COL_1, 1,
TEST_COL_2, 2,
TEST_COL_3, 3,
TEST_COL_4, 4,
TEST_COL_5, STATUS_NORMAL,
TEST_COL_6, 6,
TEST_COL_7, 7,
-1);
} 

return GTK_TREE_MODEL (store);

} /* create_and_fill_model*/

GtkWidget * create_view_and_model (void)
{
GtkCellRenderer *renderer;
GtkTreeViewColumn *column;
GtkWidget *view; 


/* create the view */
view = gtk_tree_view_new ();

/* --- Column #X --- */
renderer = gtk_cell_renderer_text_new ();
column = gtk_tree_view_column_new_with_attributes("#",
renderer,
"text",  TEST_COL_0,
NULL);
g_object_set (G_OBJECT (renderer), "xalign", 0.5, NULL);
gtk_tree_view_column_set_alignment(column, 0.5);
gtk_tree_view_column_set_resizable(column, TRUE);
gtk_tree_view_column_set_sort_column_id (column, TEST_COL_0);
gtk_tree_view_append_column(GTK_TREE_VIEW(view), column);


/* --- Column #X --- */
renderer = gtk_cell_renderer_text_new ();
column = gtk_tree_view_column_new_with_attributes("#",
renderer,
"text",  TEST_COL_1,
NULL);
g_object_set (G_OBJECT (renderer), "xalign", 0.5, NULL);
gtk_tree_view_column_set_alignment(column, 0.5);
gtk_tree_view_column_set_resizable(column, TRUE);
gtk_tree_view_column_set_sort_column_id (column, TEST_COL_1);
gtk_tree_view_append_column(GTK_TREE_VIEW(view), column);


/* --- Column #X --- */
renderer = gtk_cell_renderer_text_new ();
column = gtk_tree_view_column_new_with_attributes("#",
renderer,
"text",  TEST_COL_2,
NULL);
g_object_set (G_OBJECT (renderer), "xalign", 0.5, NULL);
gtk_tree_view_column_set_alignment(column, 0.5);
gtk_tree_view_column_set_resizable(column, TRUE);
gtk_tree_view_column_set_sort_column_id (column, TEST_COL_2);
gtk_tree_view_append_column(GTK_TREE_VIEW(view), column);

/* --- Column #X --- */
renderer = gtk_cell_renderer_text_new ();
column = gtk_tree_view_column_new_with_attributes("#",
renderer,
"text",  TEST_COL_3,
NULL);
g_object_set (G_OBJECT (renderer), "xalign", 0.5, NULL);
gtk_tree_view_column_set_alignment(column, 0.5);
gtk_tree_view_column_set_resizable(column, TRUE);
gtk_tree_view_column_set_sort_column_id (column, TEST_COL_3);
gtk_tree_view_append_column(GTK_TREE_VIEW(view), column);

/* --- Column #X --- */
renderer = gtk_cell_renderer_text_new ();
column = gtk_tree_view_column_new_with_attributes("#",
renderer,
"text",  TEST_COL_4,
NULL);
g_object_set (G_OBJECT (renderer), "xalign", 0.5, NULL);
gtk_tree_view_column_set_alignment(column, 0.5);
gtk_tree_view_column_set_resizable(column, TRUE);
gtk_tree_view_column_set_sort_column_id (column, TEST_COL_4);
gtk_tree_view_append_column(GTK_TREE_VIEW(view), column);


/* --- Column #X --- */
renderer = gtk_cell_renderer_text_new ();
column = gtk_tree_view_column_new_with_attributes("STATUS",
renderer,
"text",  TEST_COL_5,
NULL);
g_object_set (G_OBJECT (renderer), "xalign", 0.5, NULL);
gtk_tree_view_column_set_alignment(column, 0.5);
gtk_tree_view_column_set_resizable(column, TRUE);
gtk_tree_view_column_set_sort_column_id (column, TEST_COL_5);
gtk_tree_view_append_column(GTK_TREE_VIEW(view), column);

/* --- Column #X --- */
renderer = gtk_cell_renderer_text_new ();
column = gtk_tree_view_column_new_with_attributes("#",
renderer,
"text",  TEST_COL_6,
NULL);
g_object_set (G_OBJECT (renderer), "xalign", 0.5, NULL);
gtk_tree_view_column_set_alignment(column, 0.5);
gtk_tree_view_column_set_resizable(column, TRUE);
gtk_tree_view_column_set_sort_column_id (column, TEST_COL_6);
gtk_tree_view_append_column(GTK_TREE_VIEW(view), column);

/* --- Column #X --- */
renderer = gtk_cell_renderer_text_new ();
column = gtk_tree_view_column_new_with_attributes("#",
renderer,
"text",  TEST_COL_7,
NULL);
g_object_set (G_OBJECT (renderer), "xalign", 0.5, NULL);
gtk_tree_view_column_set_alignment(column, 0.5);
gtk_tree_view_column_set_resizable(column, TRUE);
gtk_tree_view_column_set_sort_column_id (column, TEST_COL_7);
gtk_tree_view_append_column(GTK_TREE_VIEW(view), column);

model = create_and_fill_model ();

gtk_tree_view_set_model (GTK_TREE_VIEW (view), model);

gtk_tree_view_set_headers_visible (GTK_TREE_VIEW (view), TRUE);

// g_object_weak_ref   (G_OBJECT (model), model_destroy_notify, NULL);


/* destroy model automatically with view */
g_object_unref (model);

return view;
} /* create_view_and_model */


void create_window (gchar * title, gint width, gint height )
{
GtkWidget *window;
GtkWidget *vbox;
GtkWidget *scrolled_window;
GtkWidget *view;

pthread_mutex_init (&mutex, NULL);  /* initializing the mutex object */ 

window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

gtk_window_set_type_hint(GTK_WINDOW (window),
GDK_WINDOW_TYPE_HINT_DIALOG);

gtk_window_set_title (GTK_WINDOW (window), title);

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

gtk_widget_show (window);

gtk_widget_set_size_request (GTK_WIDGET (window), width, height);

vbox = gtk_vbox_new (FALSE, 1);

gtk_widget_show (vbox);

gtk_container_add (GTK_CONTAINER (window), vbox); 


/* create view */

scrolled_window = gtk_scrolled_window_new (NULL, NULL);

gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW
(scrolled_window),GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC); 

view = create_view_and_model();

gtk_container_add (GTK_CONTAINER (scrolled_window),view );

gtk_box_pack_start (GTK_BOX(vbox), scrolled_window, TRUE, TRUE, 0);

gtk_widget_show (view);
gtk_widget_show (scrolled_window);


} /* create_window */



int main (int argc, char **argv)
{

g_type_init();  

/* init threads */
g_thread_init(NULL);

gdk_init(&argc, &argv); 

gdk_threads_init();

gdk_threads_enter();

gtk_init (&argc, &argv);

create_window ("TEST", 100, 400);

create_thread ();

gtk_main ();

gdk_threads_leave(); /* release GTK thread lock */


return 0;

}

-------------------------------------------------------------------

Results:

(gdb) run --g-fatal-warning
Starting program: /home/lore/Projects/test/src/test --g-fatal-warning
[Thread debugging using libthread_db enabled]
[New Thread -1216235072 (LWP 28652)]
[New Thread -1217889360 (LWP 28655)]

Gtk-ERROR **: file gtksequence.c: line 760
(_gtk_sequence_node_find_by_pos): asser tion failed: (node->parent !=
NULL)
aborting...

Program received signal SIGABRT, Aborted.
[Switching to Thread -1216235072 (LWP 28652)]
0xffffe410 in __kernel_vsyscall ()

(gdb) backtrace
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7a45175 in raise () from /lib/tls/i686/cmov/libc.so.6
#2  0xb7a467d8 in abort () from /lib/tls/i686/cmov/libc.so.6
#3  0xbfffefb0 in ?? ()
#4  0x00000000 in ?? ()
#5  0x00000020 in ?? ()
#6  0x00000000 in ?? ()
#7  0x00000000 in ?? ()
#8  0x00000000 in ?? ()
#9  0x00000000 in ?? ()
#10 0x00000000 in ?? ()
#11 0x00000000 in ?? ()
#12 0x00000000 in ?? ()
#13 0x00000000 in ?? ()
#14 0x00000000 in ?? ()
#15 0x00000000 in ?? ()
#16 0x00000000 in ?? ()
#17 0x00000000 in ?? ()
#18 0x00000000 in ?? ()
#19 0x00000000 in ?? ()
#20 0x00000000 in ?? ()
#21 0x00000000 in ?? ()
#22 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
#23 0x00000000 in ?? ()
#24 0x00000000 in ?? ()
#25 0x00000000 in ?? ()
#26 0x00000000 in ?? ()
#27 0x00000000 in ?? ()
#28 0x00000000 in ?? ()
#29 0x00000000 in ?? ()
#30 0x00000000 in ?? ()
#31 0x00000000 in ?? ()
#32 0x00000000 in ?? ()
#33 0x00000000 in ?? ()
#34 0x00000000 in ?? ()
#35 0x00000000 in ?? ()
#36 0x00000000 in ?? ()
#37 0x0810a810 in ?? ()
#38 0x0806188c in ?? ()
#39 0xbffff048 in ?? ()
#40 0xb7b77c2d in g_free () from /usr/lib/libglib-2.0.so.0
Previous frame inner to this frame (corrupt stack?)