From: Kent Sibilev <ksruby@...>
Date: 2007-04-08T02:08:52+09:00
Subject: Re: rb_yield(), break, and C extensions

On 4/7/07, Noah Easterly <noah.easterly@gmail.com> wrote:
> So, I'm working on a C extension.
>
> One of my C functions uses a callback function, so when I wrap that
> function in a method, I pass it a callback function that just wraps a
> call to rb_yield().
>
> This works great, except that when the block passed to the method
> includes a 'break' statement, the end of the C function is bypassed,
> and so it can't do its own cleanup.


You should wrap your rb_yield call with rb_ensure. From README.EXT:

 VALUE rb_ensure(VALUE (*func1)(), void *arg1, void (*func2)(), void *arg2)

Calls the function func1 with arg1 as the argument, then calls func2
with arg2 if execution terminated.  The return value from
rb_ensure() is that of func1.


-- 
Kent
---
http://www.datanoise.com