#! perl -slw use strict; use IO::Socket; use IO::Select; use threads; use threads::shared; use Thread::Queue; my $done :shared = 0; my $Qin = new Thread::Queue; my $Qout = new Thread::Queue; sub listener { my %conns; my $listener = IO::Socket::INET->new( LocalAddr => 'localhost:54321', Listen => 10, Reuse => 1 ) or die "Failed to create listener: $!"; my $sel = new IO::Select( $listener ); until( $done ) { if( $sel->can_read( 0.01 ) ) { my $client = $listener->accept; $conns{ $client } = $client; my $req = <$client>; ## Assumes request is a single line $Qin->enqueue( "$client : $req" ); warn "Accepted and queued request '$req'"; } elsif( $Qout->pending ) { my( $client, $res ) = split ' : ', $Qout->dequeue, 2; print { $conns{ $client } } $res; close $conns{ $client }; delete $conns{ $client }; } } close $listener; } my $lt = threads->create( \&listener ); while( my( $client, $req ) = split ' : ', $Qin->dequeue, 2 ) { async{ my $serv = IO::Socket::INET->new( 'localhost:12345' ); print $serv $req; warn "dequeue and forwarded '$req'"; my $res = <$serv>; warn "Retrieved and queued '$res'"; $Qout->enqueue( "$client : $res" ); close $serv; }->detach; select '','','', 0.1; ## Ensure no more than 10/s }