From: Falk Hueffner <hueffner@Informatik.Uni-Tuebingen.De>
To: xm@xmunkki.org
Cc: OCaml <caml-list@inria.fr>
Subject: Re: [Caml-list] "noalloc" + enter/leave blocking section - safe?
Date: Mon, 02 Aug 2004 17:49:53 +0200 [thread overview]
Message-ID: <87wu0hmtem.fsf@informatik.uni-tuebingen.de> (raw)
In-Reply-To: <20040802183445.A25192@xmunkki.org> (Jere Sanisalo's message of "Mon, 2 Aug 2004 18:34:45 +0300")
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.
--
Falk
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next prev parent reply other threads:[~2004-08-02 15:50 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-02 10:43 Markus Mottl
2004-08-02 15:15 ` Markus Mottl
2004-08-02 15:34 ` Jere Sanisalo
2004-08-02 15:49 ` Falk Hueffner [this message]
2004-08-02 16:02 ` Richard Jones
2004-08-02 16:32 ` Markus Mottl
2004-08-02 16:39 ` Falk Hueffner
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