If this is the case ...
It is. Regardless of the OS.
... how come ...
Best guess. The pseudo-code you are posting is a poor reflection of what your real code is actually doing.
I understand that you have good reasons for not posting the real code, so here is a suggestion. Make a copy of the real code and cut it down to just the outer and inner loops you are concerned with. Then substitute the perl 'echo' command from my post above:
my $pid = open2 \*READ, \*WRITE, 'perl -wne "$|++; chomp; print"';
Run that. It should demonstrate the same behaviours as your real program, though the iterations counts will differ. Once you have verified that it has similar problems, post it here.
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
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