 Process Spawning Design Pattern |
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 Aug 25 2004, 11:48 PM
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 Changing the world, one VI at a time.  JKI  Posts: 1692 Joined: 22-October 02 From: San Francisco, CA Member No.: 17 Using LabVIEW Since:1995 LV:8.2.1 ,8.5 ,7.1.1 
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Hello, all. Michael Aivaliotis gave a good NI Week presentation on process spawning. One factor to consider is the apparent limitation of LabVIEW in that it cannot instantiate new VIs when the root loop hangs (please the bug posting here for more info).
Do any of you out there use this (Process Spawning) design pattern? --------------------
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Aug 25 2004, 11:48 PM
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Dec 15 2004, 08:45 AM
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5 more posts to go! Member Posts: 5 Joined: 15-December 04 Member No.: 1236 LV:6.1 
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Do you have the ppt file about his topic?
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Dec 15 2004, 03:10 PM
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Changing the world, one VI at a time. JKI Posts: 1692 Joined: 22-October 02 From: San Francisco, CA Member No.: 17 Using LabVIEW Since:1995 LV:8.2.1 ,8.5 ,7.1.1
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QUOTE (hmqi @ Dec 15 2004, 12:45 AM) Do you have the ppt file about his topic?  Michael Aivaliotis gave the presentation. Send him a request. --------------------
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Dec 15 2004, 04:30 PM
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 Confucius say: Crowded elevator always smell different to midget  Admin  Posts: 2363 Joined: 13-October 02 From: Planet Earth Member No.: 2 Using LabVIEW Since:1994 LV:8.5 ,8.2.1 ,7.1.1 
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QUOTE (Jim Kring @ Dec 15 2004, 10:10 AM) Michael Aivaliotis gave the presentation. Send him a request. Here: Process Spawning --------------------
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Dec 16 2004, 12:52 AM
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5 more posts to go! Member Posts: 5 Joined: 15-December 04 Member No.: 1236 LV:6.1
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QUOTE (Michael_Aivaliotis @ Dec 16 2004, 01:30 AM) Thank you very much! It's a great topic!
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Jan 9 2005, 01:31 AM
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#6
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Active Member Posts: 14 Joined: 24-August 04 Member No.: 620 LV:7.1 |
Jim,
On a recent project I designed a CAN "server" that would actually spawn new engines for each CAN card configured using a configuration tool. Each engine would be initialized with User event references to hook into any main program. The engine would then take care of sending/receiving event driven messages or periodic messaging. I have to say that Michael Aivaliotis' NI week presentation opened up my eyes to this new idea in coding style. I think my next foray will be into the wonderful world of GOOP   Derek Lewis
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Jan 9 2005, 02:32 AM
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Changing the world, one VI at a time. JKI Posts: 1692 Joined: 22-October 02 From: San Francisco, CA Member No.: 17 Using LabVIEW Since:1995 LV:8.2.1 ,8.5 ,7.1.1
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QUOTE (bariman8 @ Jan 8 2005, 05:31 PM) Jim, On a recent project I designed a CAN "server" that would actually spawn new engines for each CAN card configured using a configuration tool. Each engine would be initialized with User event references to hook into any main program. The engine would then take care of sending/receiving event driven messages or periodic messaging. I have to say that Michael Aivaliotis' NI week presentation opened up my eyes to this new idea in coding style. I think my next foray will be into the wonderful world of GOOP Derek Lewis GOOP and Process Spawning are can be used together very nicely. For example, when spawning multiple processes (multiple instances of the same process), it is often a good idea to create a new instance of a GOOP object associated with it for managing the instance's data. Usually, I accomplish this, by doing the process spawning inside of the GOOP object's constructor. I pass the process a reference to the GOOP instance, and then the process can access the instance's data store, using that reference. I store the spawned VI's reference inside of the GOOP data store, so that a call to the GOOP destructor can kill (Abort) the spawned VI, if it can't stop it using some form of messaging. --------------------
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Jan 10 2005, 01:35 PM
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Active Member Posts: 14 Joined: 24-August 04 Member No.: 620 LV:7.1 |
Very Interesting Jim,
I definitely need to look into GOOP design. Do you know of any good websites out there that explain GOOP and its functionality? I downloaded the OpenG GOOP toolkit but a lot of it doesn't make sense to me. Thanks, Derek Lewis
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Jan 10 2005, 02:04 PM
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#9
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Active Member Posts: 11 Joined: 18-August 04 Member No.: 607 LV:7.1 |
QUOTE (bariman8 @ Jan 10 2005, 02:35 PM) Very Interesting Jim, I definitely need to look into GOOP design. Do you know of any good websites out there that explain GOOP and its functionality? I downloaded the OpenG GOOP toolkit but a lot of it doesn't make sense to me. Thanks, Derek Lewis Plenty of links here. Some of them might even still work... you might want to read up about OO design methodologies and UML notation, if any of it is unfamiliar.
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Jan 10 2005, 04:59 PM
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#10
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Changing the world, one VI at a time. JKI Posts: 1692 Joined: 22-October 02 From: San Francisco, CA Member No.: 17 Using LabVIEW Since:1995 LV:8.2.1 ,8.5 ,7.1.1
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QUOTE (bariman8 @ Jan 10 2005, 05:35 AM) Very Interesting Jim, I definitely need to look into GOOP design. Do you know of any good websites out there that explain GOOP and its functionality? I downloaded the OpenG GOOP toolkit but a lot of it doesn't make sense to me. Thanks, Derek Lewis Here is a page at OpenG.org which is dedicated to GOOP information: http://openg.org/tiki/tiki-index.php?page=GOOP --------------------
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