Fatal Python error: the function must be called with the GIL held

General TouchDesigner Discussion
1

hi. if another problem. wanted to open the sample file CHOP with Python.

but touchdesigner does not load the dll … not in debug and not in release mode. seems that some python stuff is missing … but iam not able to fint.

thats what i get as an error:
Fatal Python error: the function must be called with the GIL held, but the GIL is released (the current Python thread state is NULL)

here at line 325 it stops
PyTuple_SET_ITEM(args, 1, PyFloat_FromDouble(speed));

please. - im shure it worked some weeks ago cause i did some op’s from that sample

i also recognized, that, if i connect an lfo to the in of the cplulplus i can load the dll. but at the moment of disconnect that - touchdesigner crashes

2

Which version of Python are you linking with for your .dll?

3

Version 3.9.5

it worked allready. but something seemes to have changed

and im not able to figure out

Python 3.9.5 (tags/v3.9.5:0a7dcbd, May 3 2021, 17:27:52) [MSC v.1928 64 bit (AMD64)] on win32

4

Are you able to share your source file so I can take a look?

5

of course - but its simply the samples file from the touchdesigner samples folder - i opened in vs and loaded the debug dll into an cplusplus CHOP. as i did weeks ago. but i cant load if there is no node connected and as soon as i disconnect the LFO, it crashes ,

put all together in a zip.

i hope you can tell me, what i did wrong

thx

wetransfer link

6

Ok thanks, I’ve logged the issue and hope to look at it soon.

1 Like
7

I see you’ve added extra Python .dlls into the debug directory in your project. This is the issue, you are loading a different copy of Python than the one TD is using, so it’s not working together. I think the solution is to use a Release build, and don’t include those extra .dlls.
In the next release I’ll remove the ‘Debug’ configuration (since that requires Python*_d.dll, which isn’t used by the Release builds of TD), and instead add a RelWithDebugInfo, which will work with TD but also include debuggable code.

9

ive to apologize. it was my fault :frowning:

i had’nt recognized, that the vcpkg package manager has installed a python. wasn’t carefull enough and did not know, that there are pythons too - not only cplusplus. in vs the option use vcpkg was set to “on” - so there happened some unwanted magic …

sorry and many thanks to your inputs

h

10

ive located the problem for me - as soon as i switch on “use vcpkg” - python gets wired and it adds some dll’s from the boost or other libraries i’ve hosted in vcpkg. as soon as i switch off that - the pyton in c++ chop works as it should. that belongs to debug and release. maybe you know a solution for that. - thx.