Re: Re: Losing GtkTextBuffer when threading

[Dan McKinnon <dan danmckinnon net>]

Alan M. Evans wrote:

> On Mon, 2005-10-10 at 19:51, Dan McKinnon wrote:
>  
>
> > typedef struct networktype{
> >    ...
> >    GtkTextBuffer *output_buffer;
> >    ..
> > } networktype;
> >    
>
>  
>
> > void append_to_buffer( GtkTextBuffer *output_buffer, char *text ){
> >    GtkTextIter output_end;
> >    gtk_text_buffer_get_end_iter( output_buffer, &output_end );   
> >    gtk_text_buffer_insert( output_buffer, &output_end, text, -1 );
> > }
> >    
>
>  
>
> > int net_init( networktype *net, GtkTextBuffer *buf ){
> >    net->output_buffer = buf;
> >    append_to_buffer( net->output_buffer, "Initilizing Network\n");
> >    ...
> > }
> >    
>
>  
>
> > void *net_thread( void *args ){
> >    ...  
> >    append_to_buffer( net->output_buffer, "Getting host by name\n");
> > }
> >    
>
>  
>
> > in the main function I've done everything right, as far as I know:
> >    g_thread_init( NULL );
> >    gdk_threads_init();
> >    gdk_threads_enter();
> >    net_init( &net, txtoutput_buffer);
> >    pthread_create( &net->thread, NULL, net_thread, &net );
> >    
>
>  
>
> > What's going on here?
> >    
>
> Is there anywhere a call to gtk_text_buffer_new() ?
>
>  

I'm using GLADE to generate the code.  I'm using windows pthreads.
To get txtoutput_buffer I'm using the glade-generated function 
lookup_widget( GTK_WIDGET(windowMain), "txtOutput" );

So just to re-cap, here's what's going on

Main:
1. Aquire GtkTextBuffer and put a pointer to it inside a struct
2. Output some text to the buffer (using the pointer in the struct as the reference)
3. Start a new thread, passing the struct with the pointer to the buffer in it

Inside the thread:
1. Output to the buffer


Outputting to the buffer works fine until it gets to the thread.
I don't think it's likely to be a racing issue,  but since I hardly ever write 
threaded applications I don't know all the symptoms that come about from racing.
I know however that the buffer is properly initialized before the thread kicks in
/and/ the buffer is not modified at any other time except during and before the thread start up.

Thoughts? Solutions?

Thanks.