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Re: Multitasking?? [message #41719 is a reply to message #41711]

Sun, 21 November 2004 08:53

p.sommer
Messages: 20
Registered: April 2004

Junior Member

Ken Mankoff <mankoff@yahoo.com> wrote in message news:<Pine.OSX.4.61.0411191245570.26987@gouda.local>...
> On Fri, 19 Nov 2004, Henry Roe wrote:
>> Just an idle under-caffeinated thought: Is there a simple way for
>> two IDL processes to communicate? (besides writing to a disk on
>> file) If so, then the two GUI's could actually be separate IDL
>> processes.
>
> You can use the SOCKET command for communication w/o files.
>
> -k.
In addition, you can use IDL's shared memory (shmmap) for this. I
have done this for camera control where one process presents a GUI and
the 2nd process handles the setting of a buffer, acquiring data and
rapid display. This way, you don't loose focus on your main GUI. I
suspect your subGUI could be running in process two in a similar way
my 'slave' process was running (no GUI).

Basically, what you do is set up a structure variable that contains
data fields that need to be shared between processes. I then created
a main procedure that simply spawned mainGUI to run under IDL's
runtime engine (idlrt). From mainGUI, I had a button that started the
data acquistion. In this button's event handler, I spawned off the
2nd process also under the idlrt engine. At this point you now have
three processes going - main, mainGUI and in your case, subGUI.

There is a very simple example on RSI's user contrib site that I put
together to prototype the final solution described. See:
http://www.rsinc.com/codebank/search.asp?FID=259

If you choose to try the above and end up having questions, do not
hesitate to contact us. Thanks and good luck.

-P

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[Message index]

		Re: Multitasking?? By: JD Smith on Mon, 22 November 2004 08:55
		Re: Multitasking?? By: p.sommer on Sun, 21 November 2004 08:53
		Re: Multitasking?? By: KM on Fri, 19 November 2004 09:46
		Re: Multitasking?? By: henrygroe on Fri, 19 November 2004 09:20
		Re: Multitasking?? By: David Fanning on Thu, 18 November 2004 10:43
		Re: Multitasking?? By: p.sommer on Tue, 23 November 2004 09:11

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