GLX: Failed to make context currentX Error of failed request: GLXBadContextTag

[Mpereke Evans]

ArrayFire v3.8.0 (OpenCL, 64-bit Linux, build d99887a)
[0] NVIDIA: Quadro T2000, 3911 MB

When the ArrayFire processing thread is on abackground thread I get the following error:

GLX: Failed to make context currentX Error of failed request:  GLXBadContextTag
  Major opcode of failed request:  152 (GLX)
  Minor opcode of failed request:  5 (X_GLXMakeCurrent)
  Serial number of failed request:  385
  Current serial number in output stream:  385

when  af::Window.show() is called.

When running from the main thread there is no error.

[Pradeep Garigipati]

Hello Mpereke,

OpenGL initialization i.e in this case, the first call to ArrayFire function such as af::info or af::setDevice should happen in the main thread so that OpenCL-GL interop setup happens properly on main thread where OpenGL rendering calls are issued.

Please make sure that is the case. If you are still facing the issue, kindly create a standalone snippet that replicates what you are trying to do so that I can debug the problem on my end.

Regards,

Pradeep.

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Pradeep

https://www.linkedin.com/in/pradeepgarigipati

[Mpereke Evans]

Hi Pradeep

I found that a workaround to the problem was to also create a dummy af::window in the main for the scatter plots to work in the second thread.

It seems that calling the dummy window in the main thread set the correct OpenGL context.

see attached project for the demonstration of the problem. 

Let me know if there is a more elegant solution to the problem.