unexpected failure of cygwin32_winpid_to_pid

[Yitzchak Scott-Thoennes]

Using 20051108, I just saw failures twice in tests of the perl binding
for cygwin32_winpid_to_pid, but no failure on every try since.  The
test looks like:

my $catpid = open my $cat, "|cat" or die "Couldn't cat: $!";
open my $ps, "ps|" or die "Couldn't do ps: $!";
my ($catwinpid) = map /^.\s+$catpid\s+\d+\s+\d+\s+(\d+)/, <$ps>;
close($ps);

is(Cygwin::winpid_to_pid($catwinpid), $catpid, "winpid to pid");
is(Cygwin::pid_to_winpid($catpid), $catwinpid, "pid to winpid");
close($cat);

in perl, where Cygwin::winpid_to_pid internally just calls
cygwin32_winpid_to_pid.  I'm not able to think of any way in which
system load or a race could cause this failure.  Any suggestions?

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