Thanks David. I have been meaning to understand fully well how memory works
in terms of stack and ram. Is there any text or resource available that
could help me understand that?
Regards,
On Thu, Sep 29, 2011 at 3:55 PM, David Brown <david.br...@hesbynett.no>wrote:
> On 29/09/11 20:52, Sergio Campamá wrote:
> > Hello,
> >
> > I was under the impression that in C you could not do something like:
> >
> > void func(int size)
> > {
> > int array[size];
> > //something
> > return;
> > }
> >
> > But a friend of mine just proved me wrong, using mspgcc... Searching
> around
> > we found this to be VLA (variable length array) Does this kind of usage
> fall
> > into dynamic memory? My impression is that the answer is yes, and
> therefore
> > it shouldn't be used on microprocessors, because malloc can cause havoc
> (as
> > someone told me some emails ago in this very same group).
> >
> > What are your thoughts on VLA? Does it use malloc internally, and
> therefore
> > should be avoided?
> >
>
> Variable length arrays are like any other data - they can go in various
> places. In a case like this, you have defined a non-static local
> variable - just like any other non-static local variable, it goes on the
> stack. So as long as you are careful not to overflow your stack, this
> should be fine - it doesn't suffer from the risks you get with malloc
> (or, more accurately, the risks you get with free), namely unpredictably
> long delays, fragmented heaps, and no space errors.
>
>
>
>
>
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--
--------------------------------------
Sergio Campamá
sergiocamp...@gmail.com
------------------------------------------------------------------------------
All the data continuously generated in your IT infrastructure contains a
definitive record of customers, application performance, security
threats, fraudulent activity and more. Splunk takes this data and makes
sense of it. Business sense. IT sense. Common sense.
http://p.sf.net/sfu/splunk-d2dcopy1
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