* Bigarray.*.map_file
@ 2005-09-14 13:43 Bauer, Christoph
2005-09-14 14:07 ` [Caml-list] Bigarray.*.map_file Olivier Andrieu
0 siblings, 1 reply; 2+ messages in thread
From: Bauer, Christoph @ 2005-09-14 13:43 UTC (permalink / raw)
To: caml-list
Hi,
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.
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.
Thanks,
Christoph Bauer
Dipl. Inf.
LMS Deutschland GmbH
Luxemburgerstr. 7
D-67657 Kaiserslautern
T +49 631 303 22 152
mailto:Christoph.Bauer@lms-gmbh.de
http://www.lmsintl.com
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [Caml-list] Bigarray.*.map_file
2005-09-14 13:43 Bigarray.*.map_file Bauer, Christoph
@ 2005-09-14 14:07 ` Olivier Andrieu
0 siblings, 0 replies; 2+ messages in thread
From: Olivier Andrieu @ 2005-09-14 14:07 UTC (permalink / raw)
To: Bauer, Christoph; +Cc: caml-list
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
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