Here's one way of doing what you're asking for. Note that if you try to get an index for a child_fh value that does not exist, this method will die() on you (purposely).
my @hashes = (
{ child_fh => $obj1 },
{ child_fh => $obj2 }
);
my @readable = $s->can_read(1);
for (@readable) {
my $index = -1;
while (++$index > -1) {
last if ($hashes[$index]{child_fh} == $_);
die("object not found in $hashes!\n")
if ($index == $#hashes);
);
# $index now contains your array index, '3' or '5'
# from your example.
print $hashes[$index]{child_fh}, "\n";
}
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