Same treatment as I mentioned above: add Timeout, which is always good to have.

use POSIX;
use strict;
$|++;

my $server = IO::Socket::INET->new( 
    Type => SOCK_STREAM, 
    Proto => 'TCP', 
    LocalPort => 2500, 
    Reuse => 1, 
    Listen => 10,
    Timeout=>1
);

my $max_children = 3;
my $current_children;
my %children;


sub interrupt
{
    $SIG{CHLD}  = 'IGNORE';
    for( keys %children )
    {
        kill KILL => $_
    }
    exit;
}

sub chld
{
    $SIG{CHLD} = \&chld;
    my $pid = wait;
    $current_children--;
    delete $children{ $pid };
    
    print "Called\n";
}

print "before preforking\n";
for( 0 .. $max_children )
{
    print "forking\n";
    make_child();
    print "after forking\n";
}

print "----AFTER PRE-FORKING---------\n";

$SIG{CHLD} = \&chld;
$SIG{INT} = \&interrupt unless $^O =~ /Win32/i;

interrupt();
exit;
while( 0 )
{
    sleep;
    
    my $i = $current_children;
    while( $i++ < $max_children )
    {
        make_child();
    }
}

sub make_child
{
    my $pid;
    my $sigset;
        
    die "Error forking: $!" unless defined( $pid = fork );
    
    print "After fork: $pid\n";
    if( $pid )
    {
        $children{ $pid }++;
        $current_children++;
        
        print "if(\$pid); returning\n";
        return;
    }
    
    else
    {
        print "Else\n";
        
        $SIG{INT} = 'DEFAULT';
        
        while( 1 )
        {
            #comment out these lines to prevent freezeing
            my $client = $server->accept() or last;
            handle( $client );
            $client->shutdown(2);
            #here
        }
        
        print "exiting else\n";
        exit;
    }
    
    print "never reached\n";
}

sub handle
{
    my $client = shift;
    
    my %headers;
    
    while( <$client> )
    {
        s/\r\n$//;
        my( $k, $v ) = split/:/,$_,2;
        $headers{ $k } = $v;
        last if( length $_ == 0 );
    }
    print "After headers\n";
    
    print $client "HTTP/1.1 200 OK\nContent-Type: text/plain\n\nhi";
    $client->shutdown(2);
}
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