Using ROOT GUI in a multithread application

Newbie
,
1

Hello ROOTers!
I try to build a multi-thread application using GUI ROOT classes. It seems that some collisions appears between threads leading to a crash of my application. Is there any mandatory things to indicate in my source code of my application to avoid collisions and crashes ?

Thank you for your help

Daniel

ROOT Version: 6.24/06
Platform: Ubuntu 20.04.1
Compiler: gcc 9.4.0

2

Hi @DanielCussol,

Take a look at ROOT::EnableThreadSafety().

Perhaps, and depending on your use case, you might also be interested in ROOT::EnableImplicitMT().

Cheers,
J.

3

Hi Daniel,

Be aware that ROOT graphics is not thread safe and should be handled always from the main thread.

Regards,
Sergey

4

Hi Seguey,
Thank you for your answer. It seems that the use of a TTimer or a derived class of TTimer to update widget contents leads to the crash. It seems that updating the widget content in a specific thread works.

Regards

Daniel

5

Thank you for your answer. I have call the ROOT::EnableThreadSafety() method but the problem was still there. It seems that the use of a TTimer or a derived class of TTimer to update widget contents leads to the crash. It seems that updating the widget content in a specific thread works.

Thank you for your help !
Daniel