Can you build ffi from github and retry it on 1.9?  I added special
support for callbacks from non-ruby threads (only works on 1.9 though
- 1.8 is completely screwed in that situation).

JRuby has no problem, because upcalls from C -> java always check &
attach a JVM context, and jruby automagically adopts threads it does
not know about.


On 13 May 2010 05:53, Chuck Remes <cremes.devlist@mac.com> wrote:

> I'm starting to work with callbacks and have run into a consistent crasher. Take a look at the trace here:
>
> http://gist.github.com/398987
>
> I downloaded the ruby-1.9.1 source and poked through vm_eval.c which contains the vm_call0() function. There is a big switch statement in there that falls through to calling rb_bug().
>
> This all occurs *only* when invoking the callback. The stack trace clearly shows it is invoking a block (rb_funcall2) from the FFI library. It crashes regardless of the contents of the block (empty, puts, nil, etc.).
>
> In 1.8.7 it crashes with a LocalJumpError somewhere else.
>
> When I disable the callback, there are no crashes under either MRI.
>
> Under JRuby, everything works fine. The callback is invoked successfully.
>
> I'm wondering if this is failing because the callback may be invoked by another native thread. The library being wrapped by FFI spawns many threads that do various background tasks; one of them is likely the invocation of the cleanup callback that is causing the crash.
>
> Are there any known issues with MRI, FFI and callbacks?
>
> cr
>
>