#! perl -slw
use strict;
use threads;
use threads::shared;

my( $max, $run_count ) = 5;
LOOP1:while( $run_count < $max ) {
    my $end = time() + 10 * 60;
    my $pid :shared;
    async {
        $pid = open SHELL, qq[| ./sh1.sh]  or die $!;
    }->detach;
    sleep 1 until $pid;
    sleep 1 while kill 0, $pid and time() < $end;
    kill 9, $pid;
    $run_count++;
}