You don't show how you intend to use threads, so I'll assume you're going to spawn N worker threads, and pass the sockets to them as needed via a Thread::Queue object.

GLOB's can't be threads::shared, and aren't scalars, so they can't be passed over Thread::Queue (which is just a threads::shared array). However, you *can* get the fileno of the socket after accept()'ing, and pass it to the worker instead: (The following code hasn't been tested, its just an outline)

my $thrdq = Thread::Queue->new();

my @thrds = ();

push @thrds, threads->new(\&runworker)
    foreach (1..$num_of_threads);

while( my $newClient = $server->accept ) {

    $thrdq->enqueue(fileno($newClient));
}

sub runworker {
    my $sktno = $thrdq->dequeue();
    my $client = IO::Socket::INET->new();
    $client->fdopen($fn, '+>>');
    print $client "CLIENT: some stuff\n"
}
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IIRC, you'll also need to wait for the work thread to pick up the fileno before accepting another connection, or the master may cause a socket close when it accepts the next connection.