From: Olivier Andrieu <andrieu@ijm.jussieu.fr>
To: "Bauer, Christoph" <Christoph.Bauer@lms-gmbh.de>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Bigarray.*.map_file
Date: Wed, 14 Sep 2005 16:07:32 +0200 [thread overview]
Message-ID: <17192.11940.997486.960780@karryall.dnsalias.org> (raw)
In-Reply-To: <26EB47FDD566A7469FC862DAF373792F07D5E0@kaiserslautern1.lmsintl.com>
Hi,
Bauer, Christoph [Wednesday 14 September 2005] :
> Bigarray.Genarray.map_file uses mmap to "read" a file. How can
> I specify an offset in the file (like the offset parameter in mmap)?
> Unix.lseek doesn't help me.
You can't: mmap is called with offset 0 (see
otherlibs/bigarray/mmap_unix.c).
> How can I do an munmap? I ask because of these lines from the man-page:
>
> The munmap system call deletes the mappings for the speci-
> fied address range, and causes further references to
> addresses within the range to generate invalid memory ref-
> erences. The region is also automatically unmapped when
> the process is terminated. On the other hand, closing the
> file descriptor does not unmap the region.
unmap() is called when the bigarray is collected by the GC.
--
Olivier
prev parent reply other threads:[~2005-09-14 14:07 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-14 13:43 Bigarray.*.map_file Bauer, Christoph
2005-09-14 14:07 ` Olivier Andrieu [this message]
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