From: Francis Cianfrocca <garbagecat10@...>
Date: 2007-07-17T13:39:12+09:00
Subject: Re: C library extension question

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On 7/16/07, Ryan Davis <ryand-ruby@zenspider.com> wrote:
>
>  >
> > Write func_a, func_b, func_c as C functions that massage their
> > arguments
> > into Rubyland and call rb_funcall to hit the user-written Ruby
> > functions.
> > Similarly massage the return values from Ruby back into C values.
>
> Except that he wants the users to write func_[a-c] in ruby, to be
> invoked by C, via c function pointers. It is that last teeny
> requirement that I think blows this up.
>
>
>

EventMachine does exactly the same thing to invoke user-written event
handlers. The reactor core is in C. It calls a C stub that uses rb_funcall
to hit Ruby code. EventMachine's HTTP server also does the same thing. The
HTTP server is in C but it calls out to user-written Ruby code to fulfill
web requests.

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