As far as I know, perl multithreading is still not ready for
primetime. In any case, your description of the needs of the programs seems to argue against multithreading.
Fork/exec work fine in perl, on all platforms, although on NT they rely on some of those experimental threading features, so you could have problems there.
This sounds like a problem that's already been solved somewhere :) Unfortunately, a quick CPAN search didn't find anything that looks useful, apart from Proc::SyncExec.
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