Re: Threads

[Craig Bakalian <craigbakalian verizon net>]

On 10/22/2013 12:03 PM, Chris Vine wrote:
> On Tue, 22 Oct 2013 11:57:19 -0400
> Paul Davis <paul linuxaudiosystems com> wrote:
> > well, there were two issues. he should not have been using them at
> > all in the particular context that they were being called from,
> > because of the requirements of RT programming. but he also had the
> > issue that the functions were indeed missing when he tried to build
> > his code (he never indicated whether this was a compile, link or run
> > time missing)
> Yes he did.  He said:
>
> "I just updated to Ubuntu 13.10 and I have no
> support for
>
> gdk_threads_enter();
> gdk_threads_leave();
>
> So, my app is crashing with signal errors."
>
> That is, he said there were run time errors.  His diagnosis of the cause
> was completely bogus.  (It also seems hard to believe there were signal
> errors, but you know better than me how JACK works.)
>
> Chris

Wait, just a minute here.  I just got home to 8 emails with the heading 
Re: Threads.

First, can I put my code back the way it always worked, using 
gdk_threads_enter() and gdk_threads_leave() and compile with 
DISABLE_DEPRECATED in my makefile?

Second, this application is for my desktop only.  I have no bug reports, 
no comments, no outside requirements, this app is only used by me.  So, 
anyway to get it to work on my desktop I will do.  I am currently 
writing a function that is called from the JACK callback the way Paul is 
recommending.   However, if I can just recompile with old code...

Third, the app did crash with signal errors to the gtkTextBuffer, or 
gtkTextView.  The signal error was "cannot find line number in 
gtk_text_layout..." is what kept coming up, when, and this is key to 
understanding this issue, when I removed the gdk_threads_enter() and 
gdk_threads_leave() from the JACK callback.  This happened before 
13.10.  I had to put the gdk_threads_enter() and gdk_threads_leave()  in 
the callback to stop the errors.  All was well, I was lucky, as Paul 
stated to me 3 times, until ubuntu 13.10.

Perhaps the JACK callback did some thread priority thing that messed up 
access to the gui.  I don't have time in my schedule to debug this at 
the level of gtk_text_layout functions.  I am a composer, I have work to 
do even as I type this.  I used the app in question to print music.

I currently changed the makefile to gtk2.  So, I do have a functional app.

Craig Bakalian