IO::Select could work too. Get a list of the connections that have data to read from using IO::Select->select, and then read a line from each of them before going back to wait for more input. Only read from the sockets that have something to read, and you won't block.
my $readable = IO::Select->new;
$readable->add($oneSock, $twoSock, $redSock, $blueSock);
while (not $done)
{
my $ready = IO::Select->select($readable);
foreach my $socket (@$ready)
{
# Deal with whatever $socket has to say
}
}
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