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Re: Memory Cleanup-- Messy structure [message #71402 is a reply to message #71400]

Wed, 16 June 2010 14:16

rogass
Messages: 200
Registered: April 2008

Senior Member

On 16 Jun., 19:50, Ed Hyer <ejh...@gmail.com> wrote:
> OK, here's the sequence:
>
> IDL> STRUCT1=CREATE_STRUCT("PTR1",PTR_NEW());
> IDL> STRUCTALL=REPLICATE(STRUCT1,N)
> IDL> FOR I=0,N-1 DO STRUCTALL.PTR1=PTR_NEW(ALLDATA[*,I])
>
> Then I do what I need to do, and I'm done with it, so:
>
> IDL> UNDEFINE, STRUCTALL
>
> Except this doesn't free the memory, according to HELP,/HEAP.
>
> Since I'm not a real programmer, I still consider pointers to be kinda
> voodoo. Can someone patiently explain how I manually clean up the
> memory in this case?
>
> Thanks,
>
> --Edward H.

Hm, what's going on here. If I would do this on my PC the following
happens:

IDL> help,/heap
Heap Variables:
# Pointer: 0
# Object : 0
IDL> n=10
IDL> s={ptr1:ptr_new()}
IDL> help,/heap
Heap Variables:
# Pointer: 0
# Object : 0
IDL> sall=REPLICATE(S,N)
IDL> help,/heap
Heap Variables:
# Pointer: 0
# Object : 0
IDL> FOR I=0,N-1 DO SALL[i].PTR1=PTR_NEW(dist(i+1))
% Compiled module: DIST.
IDL> help,/heap
Heap Variables:
# Pointer: 10
# Object : 0

<PtrHeapVar1> FLOAT = Array[1]
<PtrHeapVar2> FLOAT = Array[2, 2]
<PtrHeapVar3> FLOAT = Array[3, 3]
<PtrHeapVar4> FLOAT = Array[4, 4]
<PtrHeapVar5> FLOAT = Array[5, 5]
<PtrHeapVar6> FLOAT = Array[6, 6]
<PtrHeapVar7> FLOAT = Array[7, 7]
<PtrHeapVar8> FLOAT = Array[8, 8]
<PtrHeapVar9> FLOAT = Array[9, 9]
<PtrHeapVar10> FLOAT = Array[10, 10]
IDL> undefine,sall
IDL> help,/heap
Heap Variables:
# Pointer: 0
# Object : 0

That's why I very like David's routines - they do always their jobs :)

Your problem might be that you don't correctly reference your pointer
array. You forgot:
STRUCTALL--->[I]<-----
So, maybe you allocate some memory each time in the loop, but then you
always overwrite the pointer(s).

Regards

CR

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[Message index]

		Re: Memory Cleanup-- Messy structure By: penteado on Thu, 17 June 2010 09:43
		Re: Memory Cleanup-- Messy structure By: Craig Markwardt on Thu, 17 June 2010 08:45
		Re: Memory Cleanup-- Messy structure By: rogass on Thu, 17 June 2010 01:46
		Re: Memory Cleanup-- Messy structure By: MarioIncandenza on Wed, 16 June 2010 14:53
		Re: Memory Cleanup-- Messy structure By: rogass on Wed, 16 June 2010 14:16
		Re: Memory Cleanup-- Messy structure By: rogass on Thu, 17 June 2010 23:47
		Re: Memory Cleanup-- Messy structure By: Craig Markwardt on Thu, 17 June 2010 17:10

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