Dan's thread proposal mentions:=item Automatic PMC sharing will be provided
When a PMC is placed into a container which is shared (including lexical pads and global namespaces) then that PMC will automatically be marked as shared. It is acceptable for this to trigger an exception if for some reason a PMC should not be shared between interpreters.
PMCs are, by default, not shared. This avoids sharing overhead for PMCs which are only used as temporaries and not shared. (Note that this is dangerous, and may end up not being done, due to the sharing of continuations)
I don't know why this is dangerous. A continuation is a data structure just like an array or a hash. When you share it, everything "inside" it gets shared, too. For a continuation, this could be an awful lot of stuff, but it's the safe way.
True, but the danger part is if we don't mark everything grabbed by a continuation as shared by default. If we do, we might as well mark everything as shared, as there'll be less overhead.
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Dan
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Dan Sugalski even samurai
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