synchronized fn callback execution (extend create-thread.yml)?

[Mike Hunhoff]

https://learn.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-initonceexecuteonce

[Willi Ballenthin]

that's a neat API, thanks for creating this issue!

i wonder if mutex/sychronization is a better fit than threading. but i guess we can debate this when writing the rule :-)