Re: Does dropping objects really free memory?

[Fabio Mascelloni]

----- Original Message -----
From: Marcus G. Daniels <address@hidden>
To: <address@hidden>
Sent: Wednesday, October 20, 1999 4:52 AM
Subject: Re: Does dropping objects really free memory?


> >>>>> "FM" == famasce  <address@hidden> writes:
>
> FM> I've put the source in
> FM> ftp://ftp.santafe.edu/pub/swarm/users-contrib/incoming/ in the
> FM> hope that someone can help me.
>
I'm slowly resolving my memory problems, but doing this other problems
appear.In particular, what' wrong in this code?

#import <stdio.h>
#import <collections.h>
#import <simtools.h>
#import "Coalition.h"

int main (int argc,const char **argv)
{
   int idx;
   id member;

   id <Array> firstArray;
   id <Array> secondArray;
   Coalition *coal;

   initSwarm (argc,argv);

   firstArray=[Array create: globalZone setCount: 30];
   secondArray=[Array create: globalZone setCount: 30];

   file://fill the first array with objects of class Coalition

   for (idx=0;idx<30;idx++)
      {
         coal=[Coalition createBegin: globalZone];
         [coal setLength: 8];
         coal=[coal createEnd];
         [coal randomInit];

         [firstArray atOffset: idx put: coal];
      }

    file://copy members from first to second
    for (idx=0;idx<30;idx++)
         {
         member=[[firstArray atOffset: idx] copy: globalZone];
         [secondArray atOffset: idx put: member];
         }

    //drop the second array's members
    for (idx=0;idx<30;idx++)
         [[secondArray atOffset: idx] drop];  <<<= = = = = = = STATUS ACCESS
VIOLATION!


    //drop secondArray
    [secondArray drop];

         return 0;
}

The copy method is so defined:

- copy:(id) aZone
{
 Coalition *coal;
 unsigned short idx;

 coal=[aZone allocIVars:[self class]];
 coal->selfFitness=selfFitness;
 coal->selfLength=selfLength;
 coal->ownerID=ownerID;
 coal->selfConfig=(unsigned short*)[aZone alloc:selfLength*sizeof(unsigned
short)];
 for (idx=0;idx<selfLength;idx++)
    *((coal->selfConfig)+idx)=*(selfConfig+idx);
 return coal;

}

I've not understood well when dropping an object gives an S.A.V yet:

a) When you try to drop an object belonging to another collection ?
b) When you try to drop an object that's still referenced by some other?

What else?




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