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Re: dynamic memory in call_external [message #14170 is a reply to message #14157]

Tue, 26 January 1999 00:00

korpela
Messages: 59
Registered: September 1993

Member

In article <88lnirufne.fsf@catspaw.jpl.nasa.gov>,
Vapuser <vapuser@catspaw.jpl.nasa.gov> wrote:
>
> Is it advisable to create and destroy memory within a CALL_EXTERNAL
> routine? (that is, can one safely use malloc and free?)

These are actually two separate questions. The answer to the second is
"yes," one can safely use malloc and free from a call_external routine.
IDL uses malloc and free for its memory allocations (at least in the
UNIX versions). The answer to the first question is "maybe not." Some
of the RSI domeumentation claims that this can lead to more memory
fragmentation than using IDL's allocation routines would. However I
cannot easily imagine a case in which this would happen, unless IDL
depends upon behavior of realloc that is not guaranteed to occur.

> Secondly, can one create an array in IDL (in the interpreter) that
> is page aligned (i.e. as if one had done it using the 'valloc' version
> of malloc in C) which can then be passed down into the CALL_EXTERNAL
> routine.

Not that I am aware of.

Eric
--
Eric Korpela | An object at rest can never be
korpela@ssl.berkeley.edu | stopped.
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[Message index]

		Re: dynamic memory in call_external By: Vapuser on Tue, 26 January 1999 00:00
		Re: dynamic memory in call_external By: David Foster on Tue, 26 January 1999 00:00
		Re: dynamic memory in call_external By: rivers on Tue, 26 January 1999 00:00
		Re: dynamic memory in call_external By: korpela on Tue, 26 January 1999 00:00
		Re: dynamic memory in call_external By: David Foster on Mon, 25 January 1999 00:00

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