threads::shared has no effect on variables, package or otherwise.

The question is really whether you can make a shared package variable. share doesn't say it only works on lexical variables.

Let's try it to confirm: 

$ perl -Mthreads -Mthreads::shared -E'
   share($x);
   $x = 4;
   async { say $x; ++$x; }->join;
   say $x;
'
4
5

[download]

So yes, you can.

Sharing adds magic to a variable, and thread cloning handles variables with this magic specially. It doesn't care whether the variable is accessible via the symbol table (package variable), via a function's pad (lexical variable), both or neither.

In reply to Re: Sharing Package variables across threads by ikegami
in thread Sharing Package variables across threads by metaperl

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