Re: lua_resume and a C-function as the main coroutine function problem

[Tony Finch <dot@...>]

On Wed, 14 Apr 2010, David Given wrote:
> On 2010-04-14 14:34, Tony Finch wrote:
> [...]
> > 		vois *osp =&f;
> > 		void *nsp = malloc(STACKSIZE) + STACKSIZE - SLOP;
> > 		void *dummy = alloca(osp - nsp);
>
> I would be very, very careful doing things like this --- you're utterly at
> mercy of the implementation. This will, for example, trigger any stack limit
> checking that your toolchain might be doing. And woe betide you if your
> alloca() implementations tries to memset() the data!

Yes :-)

If your implementation strays from traditional Unix (e.g. HP/UX) your
program will crash. But I think it's quite a good joke, and fun for
bending brains.

Tony.
-- 
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