#! perl
use strict;
use threads (
    'yield',
    'stack_size' => 64*4096,
    'exit' => 'threads_only',
    'stringify'
);

my $path = "/tmp";
my @files = &get_files($path);

my @thrs_loaders;

foreach my $file (@files){
    push @thrs_loaders, threads->create(\&load, $file);
}
$_->join for @thrs_loaders;

<>;
exit;

sub get_files{
  my $dir = shift;
  opendir(my $dh, $dir) or die "Cant open dir  $!"; # HERE IS THE CAUSE
  close( $dh);
  return "detail-1min-19-06-22";
}

sub load{
    my $file = shift;
    print "Processing $file\n";
}