To continue with this theme why not to share a ref to a hash. Like so: 
...
use threads;
use threads::shared;
...

my $href : shared;
$href = &share({});
...

# Lock block
{
  lock $href;
  $href->{mykey} = 'myval';
}
...

[download]
For more see perldoc threads::shared.

- BR

In reply to Re^4: Locking hash values by caelifer
in thread Locking hash values by bucky0

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