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Re: IDL and C inter-language communication / call_external() [message #89097 is a reply to message #89075]

Thu, 24 July 2014 02:08

inkorporiert
Messages: 2
Registered: July 2014

Junior Member

If I understand aright you mean that I call the routine via call_external() with initial value, then it does the first fitting step and ends returning the partial results, IDL plots and executes call_external() again with the last partial results and so on? Okay, this is a possibility, but would involve as far as I see a lot of changes in the C routine. Futhermore I think this would slow down everything a lot.

I didn't get what you mean by your second suggestion. The "external program" is a kind of deamon with the fitting routine waiting for input?

My primary idea was to allocate memory for the partial results with idl and pass that via call_external() to C. This way idl has access to the data and could plot it. But there are two problems: First I would have to create another thread for the plotting in IDL. But the major problem is the synchronisation: IDL should only plot after C has written the array and C should only write after IDL has read the array. This would require some kind of mutex-status variables that may be difficult to implement.

Thank you.

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[Message index]

		IDL and C inter-language communication / call_external() By: inkorporiert on Tue, 22 July 2014 12:34
		Re: IDL and C inter-language communication / call_external() By: Craig Markwardt on Tue, 22 July 2014 14:35
		Re: IDL and C inter-language communication / call_external() By: inkorporiert on Thu, 24 July 2014 02:08
		Re: IDL and C inter-language communication / call_external() By: Craig Markwardt on Thu, 24 July 2014 15:46

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