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Re: Calling IDL from Fortran called by IDL [message #28316 is a reply to message #28236]

Wed, 28 November 2001 14:38

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

"Mark Rivers" <rivers@cars.uchicago.edu> writes:

> Craig Markwardt <craigmnet@cow.physics.wisc.edu> wrote in message
> news:onherfoc0q.fsf@cow.physics.wisc.edu...
>>
>> Oooh, but be careful, because if you allow your IDL variable to be
>> released, say by reassigning it, then your external C routine will
>> probably end up overwriting some part of memory you didn't want it to.
>
> Yes, this technique should only be used for carefully written IDL
> "applications", and not for interactive use. Any IDL variable whose address
> has been passed to the external C or FORTRAN code can never appear on the
> left hand side of an assignment.
...
> This idea can be directly applied to the problem of interacting with
> compute-bound FORTRAN code.
...
> This eliminates that problem because the FORTRAN is a new process, not a
> thread.

These are all really great ideas! Thanks. The only thing I worry
about is Kevin's initial mention of the dreaded word, "Windows" :-)

I really like your ideas on polling a widget for an abort event. I've
been thinking about how to do that for something like MPFIT, but
didn't want to figure out all the details. Looks like you did it for
me!

Craig

--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Calling IDL from Fortran called by IDL By: Kevin A. Park on Mon, 26 November 2001 14:28
		Re: Calling IDL from Fortran called by IDL By: Mark Rivers on Wed, 28 November 2001 06:45
		Re: Calling IDL from Fortran called by IDL By: Craig Markwardt on Wed, 28 November 2001 14:38
		Re: Calling IDL from Fortran called by IDL By: Craig Markwardt on Tue, 27 November 2001 18:34
		Re: Calling IDL from Fortran called by IDL By: Stein Vidar Hagfors H[1] on Fri, 30 November 2001 13:12

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