Good start, but your client needs a sleep() at the end, to keep it from connecting then exiting. Also the server dosn't have a thread to send original msgs to the client from STDIN. It's getting close though. The server memory usage stabilizes too, after repeated connects/disconnects from multiple clients.

Update

I did try this obvious code addition to add stdin capability, BUT server-stdin messages ONLY go to the first client. For instance, if I connect with 3 clients, server's stdin only gets sent to client 1. If I close client 1, server's stdin will go only to client 2, etc. Perplexing? Probably it needs an "array of connected clients" so it can print to all, or selected clients.

#!/usr/bin/perl
use strict;
use warnings;
use threads;
use IO::Socket;

print "Starting server: $$\n";
my $server = IO::Socket::INET->new(LocalPort => 1300,
                                   Proto     => 'tcp',
                                   Listen    => 10,
                                   Reuse     => 1);
                     
die "Failed to create socket: $!\n" unless $server;

sub listen_to_client {
        my ($client) = @_;
        my $tid = threads->tid();
        while (my $get = <$client>) {
                print "client ($tid) : $get";
                print $client $get;
        };
        print "Client closed\n";        
        close $client;
}


sub stdin_to_client {
        
        my ($client) = @_;
        while (my $msg = <STDIN>) {
                print $client $msg;
        }
        print "stdin thread ended\n";
}



while (my $client = $server->accept()) {
        my $thr = threads->create("listen_to_client", $client);
        my $thr1 = threads->create("stdin_to_client", $client);
        
        print "Client connected ", $thr->tid,"\n";
        $thr->detach;
        $thr1->detach;
}
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