The way perl's threading model works is that each thread has its own interpreter, and own set of SVs. When a new thread is created, perl makes a copy of every SV it knows about, and 'gives' them to the new interpreter. The new interpreter should not be able to mess with any of the SVs belonging to another interpreter; this is not thread-safe, and crashes and panics will occur.

What you need to do is replace the callback_ref variable - which perl doesn't know about - with a perl scalar (or array if you need more than one value) that is embedded in a namespace: $Callback::callback_ref, say. Then when you create a thread, a copy of $Callback::callback_ref is made in the new thread, and everyone's happy.

Dave.

In reply to Re^3: xs, threads and panic by dave_the_m
in thread xs, threads and panic by Anonymous Monk

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