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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 18:20:16 +0200
Organization: AdaCL
Message-ID: <1459490.rBJp702xU0@linux1.krischik.com>
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Date: 2004-05-26T18:20:16+02:00
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Duncan Sands wrote:

>> Does calloc know when it gets a new page and when is gets recycled page?
> 
> This is not really a recycled page.  In any case, the answer is probably
> "no".

I was thinking about pages recycled by free (). 

>> 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;
>> }
> 
> It's more efficient to not have to zero a page unless you write to it - in
> fact to not really have any physical pages at all until you write to them.

Remember: Not all memory for malloc and calloc come staid from the OS. Some
have been freed by free (); 

With Regards

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