In the document for threads::shared pragmas, it says:

"bless is not supported on shared references. In the current version, bless will only bless the thread local reference and the blessing will not propagate to the other threads. This is expected to be implemented in a future version of Perl."

In reply to Re: Sharing Tk-module objects in threads by pg
in thread Sharing Tk-module objects in threads by kabeldag

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