Exception OpenGl_Window::CreateWindow: wglShareLists failed. Error code: 170 (The requested resource is in use)

Jerome Monaco
Thu, 01/06/2022 - 13:40

Forums:

Hi gentlemen, I have an exception in the OpenGl_Window constructor during render from another background thread.
The exception comes from wglShareLists(…) that return false and set GetLastError() to 170 (The requested resource is in use).

The main UI thread of my app use OCC to display geometry to user.

The thread that crash is using OCC with another viewer, another view, another AIS context... to generate images from geometry for a set of files in the background.

My environment is Windows 10 / OCC 7.5.0 / VS 2019.

Any idea is welcome.

Best regards.
Jerome.

Kirill Gavrilov
Thu, 01/06/2022 - 14:48

The thread that crash is using OCC with another viewer, another view, another AIS context.

Does it use a dedicated OpenGl_GraphicDriver instance as well? Note that many samples have code line this:

static Handle(OpenGl_GraphicDriver) aDriver = new OpenGl_GraphicDriver();

which would create a global driver shared across Viewers (see "static"). This should be avoided in your multi-threaded case.

Jerome Monaco
Thu, 01/06/2022 - 15:42

Hi Kirill and thanks for your prompt answer.
Yes this is the first thing I tried (sorry to have missed it in my email...) when I had first the problem, but same issue.
Does shared graphics attributes like Prs3d, Material aspects... can generate this kind of problem ?
Jerome.

Jerome Monaco
Thu, 01/06/2022 - 18:18

Hi Kirill, I am a triple idiot, I missed a line in my code where I referencing the static graphic driver of the UI in place of the one I create especially for the thread... Really sorry for your time, OCC is working perfectly well.
Best regards.
Jerome.

Kirill Gavrilov
Thu, 01/06/2022 - 20:55

Hi Jerome, no problem finding a bug in your own code ;).
Regards, Kirill.

greeshmaunni1990
Tue, 11/01/2022 - 12:17

Hi I am also facing the same error. We are using qtViewer3d to display some model and the function is running inside a thread. When I try to call the display to reload the image again I am getting the following error:

2022-11-01 12:07:14 ERROR Aspect_GraphicDeviceDefinitionError
OpenGl_Window::CreateWindow: wglShareLists failed. Error code: 170
wrapper details:
* symname: Display3d_Init
* wrapname: _wrap_Display3d_Init
* fulldecl: void Display3d::Init(long const)
Traceback (most recent call last):
File "main.py", line 232, in reopen_ifc_file
File "OCC\Display\qtDisplay.py", line 124, in InitDriver
File "OCC\Display\OCCViewer.py", line 178, in Create
RuntimeError: Aspect_GraphicDeviceDefinitionError
OpenGl_Window::CreateWindow: wglShareLists failed. Error code: 170

It is working well in ubuntu but when converted to .exe file the above error is occuring. If anyone has any idea about this error please help