And here's some working threads code to get you started.

Note:depending upon what you are doing in your sub, and whether you need the results from the subs back in the main program, it could get more complicated than this--but it will at least be doable.

#! perl -slw
use strict;
use threads;

$|=1;

my @threads;
for my $i ( 1 .. 10 ) {
    ## if the condition is true
    if( $i & 1 ) { ## every odd number matches
        ## Start a thread to run the sub
        ## Passing the number as an argument
        ## And saving the thread object,
        push @threads, async \&other, $i;
    }
}

## Wait for all the threads to finish
$_->join for @threads;

## Done.
exit;

sub other{
    my( $number ) = @_;
    print "Other( $number ) starting";
    ## pretend we're doing something that takes a while...
    for( 1 .. rand 10 ) {
        print "Other( $number ) busy ...";
        sleep 1;
    }
    print "Other( $number ) finished";
}

__END__
C:\test>542468
Other( 1 ) starting
Other( 1 ) busy ...
Other( 3 ) starting
Other( 3 ) busy ...
Other( 5 ) starting
Other( 5 ) busy ...
Other( 7 ) starting
Other( 7 ) busy ...
Other( 9 ) starting
Other( 9 ) finished
Other( 1 ) busy ...
Other( 3 ) finished
Other( 5 ) busy ...
Other( 7 ) busy ...
Other( 1 ) busy ...
Other( 5 ) finished
Other( 7 ) busy ...
Other( 1 ) busy ...
Other( 7 ) busy ...
Other( 1 ) busy ...
Other( 7 ) busy ...
Other( 1 ) busy ...
Other( 7 ) busy ...
Other( 1 ) busy ...
Other( 7 ) busy ...
Other( 1 ) finished
Other( 7 ) busy ...
Other( 7 ) finished
[download]