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From: Bonita Montero <Bonita.Montero@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: realloc() - frequency, conditions, or experiences about
 relocation?
Date: Tue, 25 Jun 2024 13:28:51 +0200
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Am 25.06.2024 um 12:55 schrieb Vir Campestris:
> On 25/06/2024 09:48, Bonita Montero wrote:
>> Test this code with your Linux installation. For my installation
>> glibc does all realloc()ations in-place. Really surprising for me.
>>
>> #include <stdio.h>
>> #include <stdlib.h>
>>
>> int main()
>> {
>>      void *p = malloc( 0x100000000 );
>>      printf( "%p\n", p );
>>      p = realloc( p, 1 );
>>      printf( "%p\n", p );
>>      malloc( 0x100000000 - 0x10000 );
>>      p = realloc( p, 0x100000000 );
>>      printf( "%p\n", p );
>> }
> Try allocating a bunch of little items, and looking at where they are. 
> They'll likely be contiguous, or evenly spaced, depending on your 
> implementation and what "little" is.
> 
> Then resize them all. Some will move.
> 
> Andy.

The interesting part is that after doing the first realloc()
the memory being freee isn't reused for the next malloc().