JRuby with coroutines

[Nick Sieger]

On Tue, Apr 6, 2010 at 11:16 AM, Lukas Stadler <lukas.stadler at jku.at> wrote:
> Today I toyed around a little bit with JRuby and coroutines.
>
> I modified JRuby to use my coroutine implementation and ran some
> fiber-microbenchmarks. The results are pretty good:
> http://classparser.blogspot.com/2010/04/jruby-coroutines-really-fast.html
>
> I know that the gains won't be nearly as big in real-world applications,
> but it surely won't hurt...

Looking forward to your openjdk and JRuby patches. In anticipation I
tried to get openjdk w/ coro built on OS X. It seems there are a few
missing pieces, which I blindly tried to fill in. I managed to get a
build, but the VM dumps when trying to yield to a coroutine. All the
gory details are here:

http://gist.github.com/358484

Included above is a commit against the mlvm/hotspot repo, please
review for correctness and feel free to commit if it looks good.

The VM was crashing on an assert in unsafe.cpp:

  assert(target_coroutine == NULL, "expecting NULL");

What could be going wrong here? I haven't been able to untangle the
coroutine magic quite yet...

Cheers,
/Nick