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[Caml-list] "noalloc" + enter/leave blocking section - safe?
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Date: -- (:)
From: Richard Jones <rich@a...>
Subject: Re: [Caml-list] "noalloc" + enter/leave blocking section - safe?
On Mon, Aug 02, 2004 at 05:49:53PM +0200, Falk Hueffner wrote:
> Jere Sanisalo <xm@xmunkki.org> writes:
> 
> > On Mon, Aug 02, 2004 at 05:15:02PM +0200, Markus Mottl wrote:
> >>---------------------------------------------------------------------------
> >>external foo : 'a -> unit = "foo_stub" "noalloc"
> >
> > Hmm, I wasn't aware that there was a "noalloc" directive. What does
> > it specifically declare? Does it make ocaml call the natives in a
> > more efficient manner (and of course the function must not allocate
> > anything)?
> 
> It calls the C function directly, with zero overhead. Otherwise, the
> call goes through "caml_c_call", which puts the GC state into global
> variables for C to pick up, and restores it later from there.
>
> > Are there any other directives I should be aware of?
> 
> There's "float", which means the function works on unboxed floats.

Cool features!

Rich.

-- 
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