Multi-threading & portability

[Jean-Yves Lefort <jylefort brutele be>]

Hi all,

Please consider the attached C source.

It runs fine on FreeBSD, but freezes on Linux. gtk_dialog_run() calls
a recursive main loop, but I don't know how to interpret this fact to
solve my problem. The workaround I use actually is to simply remove
the gdk_threads_enter()/gdk_threads_leave() pair wrapping the main
loop, as the program runs fine without them.

Why should I wrap the main loop with that pair?
Is the attached program not correct? Did I mess up somewhere?

Best regards,
Jean-Yves Lefort

-- 
Jean-Yves Lefort

jylefort brutele be
http://void.adminz.be/

#include <gtk/gtk.h>

/* compilation: */
/* cc `pkg-config --cflags --libs gthread-2.0 gtk+-2.0` -o gtk2-threadbug gtk2-threadbug.c */

static gboolean delete_event_handler (GtkWidget *widget,
				      GdkEvent *event,
				      gpointer user_data);

int main (int argc, char **argv)
{
  GtkWidget *window;
  GtkWidget *dialog;

  g_thread_init (NULL);
  gdk_threads_init();
  gtk_init (&argc, &argv);
  
  window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  gtk_widget_show (window);
  
  g_signal_connect(G_OBJECT(window), "delete_event",
		   G_CALLBACK(delete_event_handler), NULL);

  dialog = gtk_message_dialog_new(GTK_WINDOW(window),
				  GTK_DIALOG_DESTROY_WITH_PARENT,
				  GTK_MESSAGE_WARNING,
				  GTK_BUTTONS_OK,
				  "Test dialog");
  gtk_dialog_run(GTK_DIALOG(dialog));
  gtk_widget_destroy(dialog);

  /* on Linux the next instruction will freeze, on FreeBSD it will run fine */
  gdk_threads_enter();
  gtk_main();
  gdk_threads_leave();
  
  return 0;
}

static gboolean delete_event_handler (GtkWidget *widget,
				      GdkEvent *event,
				      gpointer user_data)
{
  gtk_main_quit();
  return TRUE;
}

Attachment: pgpiOChWZhkIx.pgp
Description: PGP signature