Thank you for all your replies! After some more help from c.l.p.m, I've managed to reach thus far (code below). However, some questions remains unanswered, ie, the need to limit the number of parallel connections.

And for the record, this is just a script to check if the links I have in a database are correct, ie, I'm checking for a return status code of 200, and if not, grab the status code so I can delete them from the database.

sub check_links_results {

    print $query->header;

    use LWP::Parallel::UserAgent qw(:CALLBACK);

    my $ua = LWP::Parallel::UserAgent->new;
    $ua->nonblock(1);
    $ua->agent("OpticDB LinkCheck/0.1");

    connect_to_db();

    my $clock_start = time();

    $sth = $dbh->prepare("SELECT url_en,id FROM $DB_MYSQL_NAME");
    $sth->execute ();

    my %ids;
    
    while( my ($url, $id) = $sth->fetchrow_array ) {
        $ids{$url} = $id;
        $ua->register(HTTP::Request->new(GET => $url));
    }

    $sth->finish;
    $dbh->disconnect;

    my $responses = $ua->wait;

    my $clock_finish = time - $clock_start;                # end timer
+ and compare
    $time_taken = sprintf ("%.2f", $clock_finish);        # trim time 
+to 2 decimal points

    my ($count, $htmlout) = (0, "");

    while( (undef, my $entry) = each %$responses ) {
        my $req = $entry->request;
        my $res = $entry->response;
        my $id = $ids{$req->url};
        next if $res->code == 200;
        ++$count;
        $tmpl_show_record .=  qq|
                    <table width="95%" border="0" cellspacing="0" cell
+padding="2">
                    <tr> 
                    <td width="2%" align="middle">&nbsp;</td>
                    <td width="6%" bgcolor="#EEEECC" align="right" val
+ign="top"><font face="Arial, Helvetica, sans-serif" size="2">$ref->{i
+d}</font>&nbsp;</td>
                    <td width="58%" bgcolor="#E9EBEF">&nbsp;<font face
+="Arial, Helvetica, sans-serif" size="2">$ref->{'name_en'}</font></td
+>
                    <td width="20%" bgcolor="#FFDDDD">&nbsp;<font face
+="Arial, Helvetica, sans-serif" size="2">$res_code : $res_msg</font><
+/td>
                    <td width="14%" bgcolor="#EEEECC" valign="top" ali
+gn="center"><a href="odb.cgi?action=edit_record&id=$ref->{'id'}"><img
+ src="/images/icons/edit.gif" width="15" height="15" alt="[ edit ]" b
+order="0"></a>
                    &nbsp;
                    <a href="odb.cgi?action=del_record&id=$ref->{'id'}
+" onClick="return confirm('Delete record $ref->{'id'}?')"><img src="/
+images/icons/delete.gif" width="15" height="15" alt="[ delete ]" bord
+er="0"></a>
                    &nbsp;
                    <a href="odb.cgi?action=toggle_live&id=$ref->{'id'
+}">
                |;

                if ($data_status eq "Live") {
                    $tmpl_show_record .= "<img src=\"/images/icons/liv
+eyes.gif\" border=\"0\">";
                } 
                else {
                    $tmpl_show_record .= "<img src=\"/images/icons/liv
+eno.gif\" border=\"0\">";
                } 
            
                $tmpl_show_record .=  qq|

                    </a>
                    </td>
                    </tr>
                    </table>
                    <BR>
        |;
    }

    $num_dead = $count;

    if( $count == 0 ) {
        &error_html("No dead links found!");
        exit;
    }

    $dbh->disconnect;

    &parse_template("$PATH_TEMPLATE/check_links_results.tmpl");

}
[download]

--
Wiliam Stephens <wil@stephens.org>