ooooo.

I'm really liking ikegami's XS code, which is far more simple than I expected, but this looks like a potential winner w.r.t. the original question.

Still, I'm wondering what it is we're actually getting when we do \$$: some experimenting shows that it is not at a fixed offset from PERL_GET_THX, which suggests to me that there's a separate allocation to create the reference and we're not actually getting the address of the variable itself. (At which point I'd worry about the reference being gc'ed and the address getting reused in another thread. Then again, I suppose one could just make a point of holding onto the reference... hmm... I wonder what pack "p"... will do with this).

I also think one would want to pick something other than $$ which, being a thread-independent constant, has no reason not to be shared across threads even if the current implementation is not doing that for whatever reason. But it's not like there aren't a whole mess of other things to choose from.

And if a previous thread terminates and perchance a new thread happens to reuse the exact same address for the same variable in a new interpreter, that probably doesn't matter right?
This is the same problem as process ID getting reused. I think as long as I've got time() in there we're okay (.. and I believe it's bullet-proof if I put in a sleep(1) between initializing the counter and creating the sub ...hmmm... and now we may have an argument for using microtime...)

In reply to Re^2: How do I get a unique Perl Interpreter ID? by wrog
in thread How do I get a unique Perl Interpreter ID? by wrog

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