t's good news that fork seems to only clone the current thread, but, like you say, it sounds very system-dependant, and inconsistent.
Well, your module definitely wouldn't work on Win32, and given the problems some other, non-win32 people have using the Expect module, it seems unlikely that your delightfully simple module will be sufficiently robust for widespread portability.
Given that
- (as you said in your OP), system in a threads appears to work on your system;
- that the docs for POSIX/Solaris indicate that it should work on those systems;
- and it does work on Win32;
- Up-to-date builds of Linux (post 2.6 kernel?) offer NTPL (Native POSIX Threads Libraries) with much closer POSIX conformance than the older LinuxThreads;
it seems to me that rather than writing a potentially complex module (see Expect.pm) for this, the right solution would be to verify that it does work correctly on POSIX/Solaris systems and remove the dire warning you quoted in your OP, from perlthrtut.
It might need to be replaced with a list of systems on which it definitely doesn't work correctly, or maybe just a few limitations on specific systems.
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
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