DBI + threads

thread failed to start: DBD::mysql::db selectall_arrayref failed: handle 2 is owned by thread 804bc20 not current thread 81de810 (handles can't be shared between threads and your driver may need a CLONE method added) 
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use DBI;
use threads; 
use strict;

my @dbh = (DBI->connect(...), DBI->connect(...));

sub query {
  my $i = shift;

  my $date = $dbh[$i]->selectrow_array("select SYSDATE()");
  print $date,'\n';
}

my @tids = ();
for(my $i = 0; $i <= $#dbh; $i++) {
  push @tids, threads->new(\&query, $i);
}
for(@tids) {
  $_->join;
}

Как заставить работать в таком стиле?