When I run:

use warnings;
use strict;
use threads;

my @Threads;

for my $Serv (<DATA>) {
    chomp $Serv;
    print "Created thread for $Serv\n";
    push @Threads, threads->new(sub {runMain($Serv)});
}

$_->join() for @Threads;
print "Work complete\n";


sub runMain {
    my ($server) = @_;

    print "Starting runMain('$server')\n";

    if ($server =~ /(\w.+\w\d+.+net),(\w+)/) {
       my $Server = $1;
       my $Type = $2;
       print "Connecting to $Server\n";
    }

    print "Done for $server\n";
}


__DATA__
server1.net,value
server2.net,value
server3.net,value
server4.net,value
[download]

it prints:

Created thread for server1.net,value
Created thread for server2.net,value
Starting runMain('server1.net,value')
Connecting to server1.net
Done for server1.net,value
Created thread for server3.net,value
Starting runMain('server2.net,value')
Connecting to server2.net
Done for server2.net,value
Created thread for server4.net,value
Starting runMain('server3.net,value')
Connecting to server3.net
Done for server3.net,value
Starting runMain('server4.net,value')
Connecting to server4.net
Done for server4.net,value
Work complete
[download]

How is your code different?