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Unread 31-01-2015, 02:09
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virtuald virtuald is offline
RobotPy Guy
AKA: Dustin Spicuzza
FRC #1418 (), FRC #1973, FRC #4796, FRC #6367 ()
Team Role: Mentor
 
Join Date: Dec 2008
Rookie Year: 2003
Location: Boston, MA
Posts: 1,058
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NetworkTables freeze bugs across C++/Java/Python

Some of you may remember this bug from last year that affected C++ teams. If you look at this year's NetworkTables code... pretty sure it's still there, somehow the patch slipped through.

I really like the idea of NetworkTables, and SmartDashboard/SFX are super useful -- so I spent a week examining the python NetworkTables implementation. I've identified at least two other places (though, I'm sure there's more) where deadlock/increased latency is possible -- and these places are the same across all three languages. I've written some details on this github issue.

pynetworktables has fixes for these bugs, and should be pretty stable as of 2015.1.0.

I am not planning on fixing the other platforms, as I've already spent enough of my life fixing networktables bugs But hopefully this information can help someone else fix it.
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Maintainer of RobotPy - Python for FRC
Creator of pyfrc (Robot Simulator + utilities for Python) and pynetworktables/pynetworktables2js (NetworkTables for Python & Javascript)

2017 Season: Teams #1973, #4796, #6369
Team #1418 (remote mentor): Newton Quarterfinalists, 2016 Chesapeake District Champion, 2x Innovation in Control award, 2x district event winner
Team #1418: 2015 DC Regional Innovation In Control Award, #2 seed; 2014 VA Industrial Design Award; 2014 Finalists in DC & VA
Team #2423: 2012 & 2013 Boston Regional Innovation in Control Award


Resources: FIRSTWiki (relaunched!) | My Software Stuff

Last edited by virtuald : 31-01-2015 at 02:13.
 


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