glib critical error (gthread) and gtk spinner not showing up - c

Question

I've a weird problem with distros which are !(Arch Linux).Actually I'm using Arch Linux with GNOME 3.16 and I've tried my software software with Fedora 22 alpha (GNOME 3.16), Ubuntu and Xubuntu 14.10/15.04 but I always receive the same error:GLib-CRITICAL **: Source ID XXX was not found when attempting to remove it
I know that the problem is with g_thread but I'm not able to understand why I'm not receiving that warning with Arch but only with other distros.Moreover, the gtk_spinner widgets are showing up only on Arch. On Fedora they aren't showing up and I'm not getting any errors...
gpointer (*hash_func[NUM_OF_HASH_ENTRY])(gpointer) = {compute_md5, compute_gost94, compute_sha1, compute_sha2, compute_sha3, compute_sha2, compute_sha3, compute_sha2, compute_sha3, compute_whirlpool};
struct hash_vars
{
gint n_bit; //number of hash bit (256, 384, 512)
gboolean gth_created[NUM_OF_HASH_ENTRY];
gchar *filename;
GHashTable *hash_table;
GtkWidget *hash_entry[NUM_OF_HASH_ENTRY]; //md5, gost, sha1, sha256, sha3-256, sha384, sha3_384, sha512, sha3-512, whir
GtkWidget *hash_check[NUM_OF_HASH_ENTRY]; //md5, gost, sha1, sha256, sha3-256, sha384, sha3_384, sha512, sha3-512, whir
GtkWidget *hash_spinner[NUM_OF_HASH_ENTRY];
gchar *key[NUM_OF_HASH_ENTRY];
struct threads_list
{
GThread *gth[NUM_OF_HASH_ENTRY];
} threads;
};
struct hash_vars hash_var;
/* other things */
for (i = 0; i < NUM_OF_HASH_ENTRY; i++)
{
gtk_widget_set_name (GTK_WIDGET (hash_var.hash_check[i]), bt_names[i]);
hash_var.gth_created[i] = FALSE;
g_signal_connect (hash_var.hash_check[i], "clicked", G_CALLBACK (create_thread), &hash_var);
}
result = gtk_dialog_run (GTK_DIALOG (dialog));
switch (result)
{
case GTK_RESPONSE_REJECT:
for (i = 0; i < NUM_OF_HASH_ENTRY; i++)
{
if(hash_var.gth_created[i])
g_thread_join (hash_var.threads.gth[i]);
}
g_free (hash_var.filename);
g_hash_table_destroy (hash_var.hash_table);
gtk_widget_destroy (dialog);
break;
}
}
gpointer
create_thread ( GtkWidget *bt,
gpointer user_data)
{
gint i;
struct hash_vars *hash_var = user_data;
const gchar *name = gtk_widget_get_name (bt);
for (i = 0; i < NUM_OF_HASH_ENTRY; i++)
{
if (g_strcmp0 (name, bt_names[i]) == 0)
{ hash_var->gth_created[i] = TRUE;
hash_var->threads.gth[i] = g_thread_new (NULL, (GThreadFunc)hash_func[i], hash_var);
}
}
}
and this is one of the hash functions:
gpointer
compute_md5 (gpointer user_data)
{
struct hash_vars *hash_var = user_data;
if (!gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (hash_var->hash_check[0])))
{
gtk_entry_set_text (GTK_ENTRY (hash_var->hash_entry[0]), "");
goto fine;
}
else if (g_utf8_strlen (gtk_entry_get_text (GTK_ENTRY (hash_var->hash_entry[0])), -1) == 32)
goto fine;
gpointer ptr = g_hash_table_lookup (hash_var->hash_table, hash_var->key[0]);
if (ptr != NULL)
{
gtk_entry_set_text (GTK_ENTRY (hash_var->hash_entry[0]), (gchar *)g_hash_table_lookup (hash_var->hash_table, hash_var->key[0]));
goto fine;
}
gtk_spinner_start (GTK_SPINNER (hash_var->hash_spinner[0]));
/* computing md5 */
fine:
gtk_spinner_stop (GTK_SPINNER (hash_var->hash_spinner[0]));
g_thread_exit(NULL);
}
So, to summarize, my problems are:
I receive a GLib-Critical error only on distro !(Arch Linux)
gtk_spinner are showing up only on Arch
All suggestions are welcome :)

Answer 1

"GTK+, however, is not thread safe. You should only use GTK+ and GDK from the thread gtk_init() and gtk_main() were called on. This is usually referred to as the “main thread”."
— https://developer.gnome.org/gdk3/stable/gdk3-Threads.html#gdk3-Threads.description
Basically, any time you want to interact with GTK+ you should do it using an idle callback. That link explains how.
As for why it works on some platforms but not others, it's probably a race condition.