[Issue 20256] problem with signal handling and parallel GC on linux

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20256

--- Comment #4 from Rainer Schuetze <r.sagitario at gmx.de> ---
(In reply to igor.khasilev from comment #3)
> I can spend time and prepare PR if it hav any chance to be accepted.

That would be great. I'm not a posix/linux expert, so help is appreciated.

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