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From: Martin Krischik <krischik@users.sourceforge.net>
Newsgroups: comp.lang.ada
Subject: Re: Is the Ada run-time required to detect out-of-memory
Date: Wed, 26 May 2004 10:16:23 +0200
Organization: AdaCL
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Date: 2004-05-26T10:16:23+02:00
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Duncan Sands wrote:

>> one could use calloc. calloc zeros memory and therefore touches every
>> page.
> 
> Maybe not - perhaps the virtual memory mapping just points those pages at
> the zero page (a special physical page filled with zeros), with
> copy-on-write so you get assigned a real page only if you write to it
> (calloc won't need to write, because it knows the page starts "filled"
> with zeros).

Does calloc know when it gets a new page and when is gets recycled page?

After all the simplest calloc implementation would be:

void*
calloc(size_t nmemb, size_t size)
{
  auto void* result = malloc (nmemb * size);
  memset (result, '\0', nmemb * size);
  return result;
}

With Regards

Martrin
-- 
mailto://krischik@users.sourceforge.net
http://www.ada.krischik.com