[Visualpython-users] Blocking on faces

[Bruce S. <Bru...@nc...>]

I now realize that the problem I see with non-framed faces (including 
bar graphs) on Ubuntu Linux with Visual beta4.15 has nothing to do with 
upgrading to the latest version of Linux. Rather, the issue is a change 
made by Mikhail Temkine in April to address a problem he saw on his 
Windows machine. Here is what he wrote to me (I'd forgotten this):

"I added a lock(mtx) to faces::gl_render and now faces_heightfield 
doesn't crash anymore, like it used to. (On my machine at least)
There was a concurrency issue with render and append."

It is this new lock that is blocking forever on Linux, though it doesn't 
block on Windows. Strange. I don't understand the interactions among the 
various Visual threads, but I'm guessing that whatever problem Mikhail 
saw, this fix only happened to work but doesn't really address the 
problem he was trying to solve. I note that no other object has a lock 
in its render routine.

I'm going to remove the lock and rebuild both Windows and Linux 
versions, and wait for the heightfield problem to show up again for someone.

Bruce Sherwood