From: Christopher Quinn <cq@htec.demon.co.uk>
To: Jacques Garrigue <garrigue@kurims.kyoto-u.ac.jp>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] NULL as a caml value
Date: Mon, 13 May 2002 11:05:34 +0100 [thread overview]
Message-ID: <3CDF8FEE.7040505@htec.demon.co.uk> (raw)
In-Reply-To: <20020513162035N.garrigue@kurims.kyoto-u.ac.jp>
Jacques Garrigue wrote:
> From: Lauri Alanko <la@iki.fi>
>
>>The docs weren't very clear on this, so I just wanted to check: is
>>(value)NULL a legal caml value? Checking from the sources, it seems that the
>>GC does leave alone all pointers that don't point to within the caml-managed
>>heap. However, the docs state that only "memory allocated by malloc" can be
>>turned directly into an abstract caml value. So may I rely on NULL working?
>>It would ease dealing with many C interfaces.
>
>
> Yes, NULL is valid, as are all word-aligned addresses outside of the
> Caml heap.
Does it even need to be word aligned?
If Is_long() tests positive the 'pointer' is also ignored.
I hope I have not erred!?
- chris
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next prev parent reply other threads:[~2002-05-13 9:05 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-05-12 20:45 Lauri Alanko
2002-05-13 7:20 ` Jacques Garrigue
2002-05-13 10:05 ` Christopher Quinn [this message]
2002-05-13 10:56 ` Jacques Garrigue
2002-05-13 19:47 ` Lauri Alanko
2002-05-13 14:56 Damien Doligez
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