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Re: Memory leak in STRMID [message #92110 is a reply to message #92109]

Wed, 14 October 2015 10:27

chris_torrence@NOSPAM is currently offline

chris_torrence@NOSPAM
Messages: 528
Registered: March 2007

Senior Member

On Wednesday, October 14, 2015 at 10:15:34 AM UTC-6, Chris Torrence wrote:
> On Wednesday, October 14, 2015 at 5:33:18 AM UTC-6, superchromix wrote:
>> I can confirm that the same behaviour occurs in IDL 8.5.
>>
>> nice catch
>>
>> Mark
>
> Hmmm, well, here's the comment I found in the strmid function:
>
> * NOTE: This routine does not re-allocate memory to hold the
> * shortened string in order to avoid unneccessary fragmentation
> * of virtual memory. It simply uses the existing string memory
> * (moving the trailing null character up) unless the resulting string is
> * null (in which case it is freed).
>
> So, bug? Feature? Undesirable side effect?
>
> -Chris

Okay, I fixed this.

Just FYI, this wasn't a "leak" - IDL was still keeping track of the memory, and doing a .reset would free up the memory.

STRMID now creates new strings of the correct length, regardless of whether the input strings are temporaries or not. This may lead to some memory fragmentation, but that's probably better than wasting a bunch of memory.

Thanks for reporting it!

-Chris

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[Message index]

		Memory leak in STRMID By: Heinz Stege on Wed, 14 October 2015 04:26
		Re: Memory leak in STRMID By: markb77 on Wed, 14 October 2015 04:33
		Re: Memory leak in STRMID By: chris_torrence@NOSPAM on Wed, 14 October 2015 09:15
		Re: Memory leak in STRMID By: chris_torrence@NOSPAM on Wed, 14 October 2015 10:27

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