Is it advisable to use the Perl's fork() emulation in Windows in “production” code?
Personally, I'd say that you should not use Perl's Win32 fork emulation at all.
This not necessarily because of bugs in that implementation -- though I have no doubts they exist -- but because
- that emulation is not complete enough to allow *nix programming paradigms to be ported to windows without changes
- its actual behavior isn't well-enough (at all?) documented to allow for a set of rules to be written down about what will and won't work.
As is, the fork emulation creates expectations of portability that are simply not achievable. Better I think to simple say "do not use".