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Updating buffer with background worker

 
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Updating buffer with background worker
killnine
post 9 Jul, 2008 - 01:12 PM
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Hey guys,
Lots of questions lately, right?

Anyhow, I am creating a program that collects data from a system at a high rate of speed (think 24 doubles at 10ms/100hz). What I am trying to do is create a buffer to store a timestamp and 24 signals.

Right now I am creating an array of 25 doubles. THEN I put that array into a List<double[]>. I repeat this process at 10ms intervals until my user interface grabs the buffer, displays it on the screen (via ZedGraph) and clears the buffer.

However, I am running into the problem where I can EITHER update the buffer or update the graph: not both. So I get these huge gaps in my data (100ms+) while the system updates the UI.

I think a background worker would be useful here. But my question is really this: can I update my buffer periodically, and still access/clear it from the UI thread? I don't think I can, but how else could I solve this problem? Yikes!
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zakary
post 10 Jul, 2008 - 03:35 AM
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you can you just need to invoke the update method when you want it to update
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killnine
post 10 Jul, 2008 - 04:59 AM
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QUOTE(zakary @ 10 Jul, 2008 - 04:35 AM) *

you can you just need to invoke the update method when you want it to update


I ended up throwing the 5ms loop into a background worker and accessed the List on the UI thread. It works fine.

I thought I was going to have a problem with crossthreading, but it doesn't seem to be an issue. Cool. =)
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zakary
post 10 Jul, 2008 - 05:09 AM
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If you start to have problems with crosstreading what you can do is use a Lock(this) {}. this will lock the section you are having problems with for a short time and normally the user will not see this or be effected by it.
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killnine
post 11 Jul, 2008 - 06:42 AM
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QUOTE(zakary @ 10 Jul, 2008 - 06:09 AM) *

If you start to have problems with crosstreading what you can do is use a Lock(this) {}. this will lock the section you are having problems with for a short time and normally the user will not see this or be effected by it.



Ah yes, lock can be used.

I have used that function in the past with great success. I sorta forgot about it tongue.gif

No problems reported as of yet....::crosses fingers::
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