[Gtk-sharp-list] Strange Tree Model behavior (Multi-Threading)

[James Talton]

instead of the
  System.Threading.Thread.Sleep(100);
call
    t.Join();

Once you click the close, if it does not close, break in the the debugger.
Make sure the main thread is at t.Join() and then check the other thread and
see why it is not exiting.


On 6/14/07, Michael Fasolino <Michael_Fasolino at raytheon.com> wrote:
>
>
> Alright, so after some more debugging, it appears that the problem wasn't
> just a Multi-threading one.  In my code one of the first things that I did
> on the newly spawned thread was to make some calls into the unmanaged
> environment.  The parameter lists of one of my dllExport/dllImport pairs
> were not matching.  For some reason the compiler did not catch this, and
> when I was running the app without debugging it seemed like it was working
> fine. It was only when I ran the debugger that it caused the GetValue
> function to return null.  The only thing that I can think of is that some
> memory necessary to the Models was being overwritten by the bad parameter
> list.
>
> So, my initial problem is solved!  But, since we are on the subject of
> multithreading, I am having a problem that I had not chased down yet.  It is
> that after the second thread is spawned when I hit the 'X' to close the app
> it becomes unresponsive.  It seems like the second thread is not getting
> cleaned up properly.  Here is what I am doing so far.
>
> James, I implemented the code that you suggested like so:
>
> GLib.Thread.Init();
> Gdk.Threads.Init();
> Application.Init();
>
> Gdk.Threads.Enter();
>
> ...
> //Some random setup stuff here (models, combo boxes ect).  Should I remove
> //this code and place it somewhere else?
> ...
>
> //I have tried spawning this thread several places, this is just the
> latest
> System.Threading.Thread t = new System.Threading.Thread(new
> System.Threading.ThreadStart(RecieveLoop));
> t.Start();
>
> try
> {
> Application.Run();
> }
> finally
> {
> Gdk.Threads.Leave();
> }
>
>
> When I try to close the window, the delete event gets fired, and then it
> just seems to hang.  I am assuming that I need to do something here, but am
> not quite sure what it is.
>
> public void on_MainWindow_delete_event(object o, DeleteEventArgs args)
> {
> //This bool causes the spawned thread to fall out of its infinate loop
> CoeTools.KillRecieverThread = true;
>
> System.Threading.Thread.Sleep(100);
> Application.Quit();
> args.RetVal = true;
> }
>
>
> Thanks for the help!
>
>
>
>
>  *"James Talton" <talton at gmail.com>*
>
> 06/12/2007 02:10 PM
>   To
> "Michael Fasolino" <Michael_Fasolino at raytheon.com>  cc
> gtk-sharp-list at ximian.com  Subject
> Re: [Gtk-sharp-list] Strange Tree Model behavior (Multi-Threading)
>
>
>
>
>
>
> I was seeing weird behavior on Windows with GTK and getting random
> exceptions.  From some other discussions on this mailing list I did the
> following:
>
> Glib.Thread.Init();
> Gdk.Threads.Init();
> Application.Init();
>
> Gdk.Threads.Enter();
> try
> {
>    Application.Run();
> }
> finally
> {
>    Gdk.Threads.Leave();
> }
>
> See if that fixes your problem.  If it does, please let us know.
>
> If it does not fix your problem, put a breakpoint where you call GetValue,
> open up the threads window and make sure your calls are being done on the
> main thread.
>
> - James
>
>
>
> On 6/12/07, *Michael Fasolino* <*Michael_Fasolino at raytheon.com*<Michael_Fasolino at raytheon.com>>
> wrote:
>
> All,
>
> Upon further exploration this seems to be a Multi-Threading problem as the
> GetValue calls are work fine while debugging until I kick off a second
> thread.  I am still stumped as to why this will not work while I am
> debugging and work fine while I am running with without debugging.  I have
> gone through the multithreading tutorial on the Mono page and it looks like
> I am setting everything up the same as suggested.
>
> Does anyone have any ideas?
>
> Thanks in advance.
>
>
>
>   *Michael Fasolino <**Michael_Fasolino at raytheon.com *<Michael_Fasolino at raytheon.com>
> *>*
> Sent by: *gtk-sharp-list-bounces at lists.ximian.com*<gtk-sharp-list-bounces at lists.ximian.com>
>
> 06/07/2007 02:08 PM
>
>   To
> *gtk-sharp-list at ximian.com* <gtk-sharp-list at ximian.com>  cc
>
>  Subject
> [Gtk-sharp-list]  Strange Tree Model behavior
>
>
>
>
>
>
>
>
>
> This seems really weird to me, but if figured that I would throw it out
> and see if anyone else had seen anything like it.  I am using Visual Studio
> 2005 for my development environment.  When I run my program in debug mode
> the <Model>.GetValue calls seems to all return null.  I am not sure if the
> problem is with the models or with the GetValue function.  Is there an easy
> way to view a model's contents when debugging without using the GetValue
> function?
>
> I am at a loss as to what would be causing this.  When I run the program
> without debugging everything works fine.
>
> Any help would be appreciated!  Thanks!
>
> Michael _______________________________________________
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