Any ROOT GUI freezes when launched from Python IDLE in Mac

ROOT
1

It was running all fine before when used PyRoot with ROOT5 in Mac. But recently due to OS upgrade, I installed ROOT6. Things gets very weird. Any graphics launched from the Python IDLE would freeze though IDLE itself runs fine. A simple example like :
import ROOT
tb = ROOT.TBrowser()

the ROOT icon would then appear in the dock and the cursor becomes a spinning wheel forever. The ROOT object browser would never comes up. But if I launched it in the python command line, everything looks fine. I have reinstalled python and root6 for many times and it won’t work. My current versions are Python 2.7.13 and ROOT 6.08/06, both installed through Brew. My OS is El Capitan.

Any idea what is going on? Thanks.

2

Yeah, easy, do not run it from idle. ROOT Cocoa/event loop must work on the main thread.

3

Thanks. But it is much easier to test something in IDLE. It works before, does it? Or My mind is confused.

4

Well, you probably know better if it worked before, I never tried to run/execute ROOT from idle (and honestly, never needed it). Cocoa works now as it worked before - it always required the main thread to run NSApplication/event loop/UI logic on. You can disable Cocoa back-end and use X11/XQuartz based one if you really need it (unfortunately I do no know how you do this nowadays with cmake, something like -Dcocoa=OFF when configuring ROOT?)

5 
cmake  -Dcocoa=OFF -Dx11=ON
6

Thanks, Olivier. I do not care though, since I never had to disable Cocoa :smiley:

1 Like
7

Thanks. That helps a lot.

8

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