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Full Discussion: find size of heap allocated
Top Forums Programming find size of heap allocated Post 302520044 by Loic Domaigne on Thursday 5th of May 2011 04:21:02 PM
Old 05-05-2011
Quote:
Originally Posted by rupeshkp728
I want to find the size of the total memory allocated on the heap for the following statement:
int* a = new int[1000];How can I use the sizeof operator for this?
I used:
printf("\t===> %d\n",sizeof(*a));

Is this statement correct?

I have asked the question because when I checked the memory of heap allocated in windbg it shows me the size as fc4 i.e. 4036 which is more then 4000 and not as desired. Any hint as to what may be the cause?
The statement is not correct, you'll get the size of an int on your architecture.

windbg... hmm... that's doesn't sound really Un*x...

Remember that new[] is an operator provided by your compiler, we don't know what it does... It may for instance add a header for internal bookkeeping; or perhaps the underlying allocation mechanism on your system imposed this... Who knows?

You'll have to look at the interna of the new[] operator to find it out.

Cheers, Loïc
 

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AUTFREEHEAP(3)							   AUT FUNCTIONS						    AUTFREEHEAP(3)

NAME
autfreeheap - releases a memory block, and put it on the heap. ORIGIN
This software belongs to the ALLIANCE CAD SYSTEM developed by the ASIM team at LIP6 laboratory of Universite Pierre et Marie CURIE, in Paris, France. Web : http://asim.lip6.fr/recherche/alliance/ E-mail : alliance-users@asim.lip6.fr SYNOPSYS
#include "aut101.h" void autfreeheap( Pointer, Size ) char *Pointer; unsigned int Size; PARAMETERS
Pointer Pointer to be given back to the heap. Size Size of the block previously allocated by autallocheap. DESCRIPTION
autfreeheap frees a pointer and puts the block back to the heap. Its use is necessary to free memory blocks, previously allocated by autallocheap. RETURN VALUE
autfreeheap returns nothing. EXAMPLE
#include "aut101.h" typedef struct bipointer { struct bipointer *NEXT; void *DATA; } bipointer; bipointer *addbipointer( Data ); void *Data; { bipointer *Bp = (bipointer *)autallocheap( sizeof( bipointer ) ); Bp->DATA = Data; return Bp; } void delbipointer( Bp ); bipointer *Bp; { autfreeheap( Pointer, sizeof( bipointer ) ); } SEE ALSO
aut(1), autresizeblock(3), autallocheap(3), autallocblock(3), autfreeblock(3). BUG REPORT
This tool is under development at the ASIM department of the LIP6 laboratory. We need your feedback to improve documentation and tools. ASIM
/LIP6 October 1, 1997 AUTFREEHEAP(3)
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