Yes thanks for that. Unfortunately the servers this will run on are all missing threads.pm So that won't be a solution I can use because updating the servers, which I am not in charge of, is not really an option. 
print "read_set is now: $read_set \n";
$read_set->add(fw1);
print "read_set is now: $read_set \n";
$read_set->add(fw2);
print "read_set is now: $read_set \n";

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this results in: read_set is now: IO::Select=ARRAY(0x1acf0e4) read_set is now: IO::Select=ARRAY(0x1acf0e4) read_set is now: IO::Select=ARRAY(0x1acf0e4) Is this what's expected after $read_set->add(FH)?

In reply to Re^2: working with 2 inputs by sktron
in thread working with 2 inputs by sktron

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