[Gtk-sharp-list] Crashes at random spots

[Eric Albright]

I received one reply off list that solved my problem. So I'll summarize 
it here.

It turns out that even when you label your main function with 
[STAThread] on a dual-core machine, we get problems with weird crashes. 
The solution is to use the following thread idiom: ||

 Glib.Thread.Init();
 Gdk.Threads.Init();
 Application.Init();

 Gdk.Threads.Enter();
 try
 {
   Application.Run();
 }
 finally
 {
   Gdk.Threads.Leave();
 }

<http://www.go-mono.com/docs/index.aspx?link=T%3AGdk.Threads>Mono's 
discussion of threads 
(http://www.go-mono.com/docs/index.aspx?link=T:Gdk.Threads) applies, 
although it indicates that it is only applicable to multi-threaded 
applications, .NET applications are effectively multi-threaded even when 
it seems that you are writing a single threaded application.

Eric

Eric Albright wrote:
> Hi,
>
> We have been experiencing crazy random crashes that give us one of the 
> messages: "Attempted to read or write protected memory. This is often an 
> indication that other memory is corrupt." or "Object reference not set 
> to an instance of an object.". The stack indicates that it is trying to 
> destroy GTK objects. Our program dynamically generates a form based on 
> the data underneath and it consistently happens while iterating through 
> records. I tried to reproduce this on my machine at home and was unable 
> to which then led me to believe that perhaps there was a threading 
> problem since our machines at work are dual core machines.
>
> I thought perhaps it had to do with interaction with the garbage 
> collector on a different thread and so I set gcConcurrent=false in the 
> app.config, but this hasn't solved the problem.
>
> Anyone have any pointers or ideas?
>
> Thanks,
>
> Eric
> wesay.org
>
> "Object reference not set to an instance of an object."
>    at GLib.Signal.OnNativeDestroy(IntPtr data, IntPtr obj)
>    at GLib.Signal.g_object_set_data(IntPtr instance, IntPtr key, IntPtr 
> data)
>    at GLib.Signal.DisconnectObject()
>    at GLib.Signal.RemoveDelegate(Delegate d)
>    at Gtk.Object.Dispose()
>    at Gtk.Alignment.Finalize()
>
> "Attempted to read or write protected memory. This is often an 
> indication that other memory is corrupt."
>    at Gtk.Object.gtk_object_destroy(IntPtr raw)
>    at Gtk.Widget.Destroy()
>    at WeSay.LexicalTools.EntryViewTool.RefreshDetailArea(Box parent) in 
> C:\WeSay\src\LexicalTools\EntryViewTool.cs:line 113
>    at WeSay.LexicalTools.EntryViewTool.OnPositionChanged(Object sender, 
> EventArgs e) in C:\WeSay\src\LexicalTools\EntryViewTool.cs:line 133
>    at System.Windows.Forms.BindingSource.OnPositionChanged(EventArgs e)
>    at 
> System.Windows.Forms.BindingSource.CurrencyManager_PositionChanged(Object 
> sender, EventArgs e)
>    at System.Windows.Forms.CurrencyManager.OnPositionChanged(EventArgs e)
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