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[Octave-bug-tracker] [bug #48273] Race condition in OpenGL plotting


From: John W. Eaton
Subject: [Octave-bug-tracker] [bug #48273] Race condition in OpenGL plotting
Date: Wed, 24 Oct 2018 09:47:20 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0

Follow-up Comment #9, bug #48273 (project octave):

If you are using the --no-gui-libs option, then what graphics toolkit are you
using?  fltk?

With either qt or fltk, I see the bug if N larger than 10 or so.  The display
on the screen is also incorrect.

With gnuplot, it works, slowly, and each subplot taking longer to appear than
the last.  The final plot is shown on the screen after Octave exits.

If I replace the two set(0,...) commands in the script with


set (0, "defaultfigureposition", [1000,100,560,1200])


then it works for larger values of N, but eventually fails again.

So now I'm thinking that when we try to place too many subplots in the figure,
we end up sending bad values to the OpenGL library that result in garbage
output.


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