Hang on Cygwin

[Achim Gratz]

The following change (hidden in commit 426ea9b37283) breaks parallel on
Cygwin:

--8<---------------cut here---------------start------------->8---
@@ -5485,7 +5485,8 @@ sub compute_number_of_processes {
            # The child takes one process slot
            # It will be killed later
            $SIG{'TERM'} = $Global::original_sig{'TERM'};
-            sleep 10101010;
+           # 'exec sleep' takes less RAM than sleeping in perl
+           exec 'sleep', 10101;
             exit(0);
        } else {
            # Failed to spawn
--8<---------------cut here---------------end--------------->8---

The symptom is that the process doing the exec plus the just execed
sleep (still shown as a child of perl) hang indefinitely until the
process gets HUPed or KILLed.  I have not yet been able to figure out
exactly why this happens, a simple script doing the exec into sleep
works as expected, it might have to do with custom signal handlers.


Regards,
Achim.
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