tor-browser-build/projects/tor-browser/run_scripts

#!/usr/bin/perl -w
use strict;

use Parallel::ForkManager;
use File::Slurp;

sub exit_error {
    print STDERR "Error: ", $_[0], "\n";
    chdir '/';
    exit (exists $_[1] ? $_[1] : 1);
}

exit_error "Wrong number of arguments" unless @ARGV == 2;
my ($nb_threads, $scripts_dir) = @ARGV;
exit_error "Could not enter $scripts_dir" unless chdir $scripts_dir;
my $pm = Parallel::ForkManager->new($nb_threads);
$pm->run_on_finish(
    sub {
        my ($pid, $exit, $id) = @_;
        exit_error "Error running $id" unless $exit == 0;
        print "Finished $id\n";
    }
);
foreach my $script (sort(read_dir($scripts_dir))) {
    $pm->start($script) and next;
    print "Running $script\n";
    exit_error "Error running $script" unless system("./$script") == 0;
    $pm->finish;
}
$pm->wait_all_children;