Problem in synchronizing two executions

One execution (not in loop structure) is to run vi-A to move a motor by certain distance. Another execution is a loop struction, and in each loop execution vi-B inside it acquires current motor position.
I hope to synchronize this two executions so that when the motor just begin to move, the vi-B simultaneously begin to acquire position. However, I always failed to synchronize them. In the position ~ time plot, there are always a short beginning period where position is zero.
Any suggestion on solving this problem? Thanks a lot.
Dejun

My first thought is why make it into two separate threads? It may be easier to have it move then read position in a loop. This would simplify the problem and make things easier.
If you need to use threads I have two thoughts. Use LabVIEW 8.0 Shared Variable to share information between the two threads. You can also FIFO commands using the Shared Variable. Second thought is that you may be overrunning one of the threads. You can probably read faster that you can move so put loop count indicators on the front panel to see how many iterating each thread has run. You may be surprised by what you see.
Let me know if this is any help. If not, fire me back a specific question and I will try to help,
Matt
Matthew Fitzsimons
Certified LabVIEW Architect
LabVIEW 6.1 ... 2013, LVOOP, GOOP, TestStand, DAQ, and Vison

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<subject edited by moderator>
Message was edited by: Manish Kumar

Hi,
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After 2 day rutern show all my contacts !!!
what's the problme ??

On my iPad mini, my inbox number count is over 500 even though the inbox. Is empty. All accounts do this on my iPad but all my other device are fine. Problem showed up two weeks ago???

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Hi Peter,
Thanks for participating in the Apple Support Communities.
It sounds like the Mail app on your iPad mini is showing that you have over 500 unread email messages, but your inbox is actually empty.
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Press and hold the Sleep/Wake button until the red slider appears.
Drag the slider to turn your device completely off.
After the device turns off, press and hold the Sleep/Wake button again until you see the Apple logo.
If this doesn't correct the behavior, try removing and re-adding the affected email accounts next:
Get help with Mail on iPhone, iPad, and iPod touch - Apple Support
Delete the affected email account from your device.
Tap Settings > Mail, Contacts, Calendars.
Tap the affected email account.
Tap Delete Account.
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If the same thing happens after re-adding the account, you may need to use the steps below to reinstall iOS. You may want to back up your iPad to iTunes before completing this step.
Make sure that you have iTunes 12 or later on your computer.
Put your device in recovery mode.
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From:
If your iPhone, iPad, or iPod touch doesn't respond or doesn't turn on - Apple Support
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[svn:fx-trunk] 10214: This fixes the problem that if two text components share the same textFlow there is an infinite loop involving updateDisplayList - damageHandler - invalidateDisplaylist - back to updateDisplayList.

Revision: 10214
Author:   [email protected]
Date:     2009-09-13 07:33:58 -0700 (Sun, 13 Sep 2009)
Log Message:
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Reviewer: Gordon
Tests run: checkintests, TextArea, TextInput and NumericStepper
Is noteworthy for integration: no
Ticket Links:
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Revision: 10214
Author:   [email protected]
Date:     2009-09-13 07:33:58 -0700 (Sun, 13 Sep 2009)
Log Message:
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Bugs: SDK-23002
Reviewer: Gordon
Tests run: checkintests, TextArea, TextInput and NumericStepper
Is noteworthy for integration: no
Ticket Links:
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Is the "first run is fast, second run is slow" reproducible? I mean, is it the first run of the day? Or was just the very first run fast, and now it is always slow?
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Call our customer care, they'll sort this out. You can find the details from "contact us" link on top of this page.

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I made this code for implementing some Lock because I have to permit the write/read action on shared file between different threads. I would like to let more than one thread reading at the same time and just one for the writing
This is my code, it's in italian but in english the class name would be AccessManager
import java.io.Serializable;
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//number of writer waiting
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try {
//Fino a che c'e' qualcuno in scrittura o processi che aspettano per la scrittura mi metto in attesa -- If ther is some thread writing or waiting for write
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if (lettori == 0) {
notifyAll();
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try {
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} catch (InterruptedException ex) {
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It's possible to two different thread read at the same time? The .lockRead() method is synchronized: if one thread has acess in a critical part it takes the lock and no other thread would be able to have an access on the same part?! How can i do this? I have not to declare synchronized the read method?
Please help me and sorry for my bad english!!
Bless from Italy

>
I made this code for implementing some Lock because I have to permit the write/read action on shared file between different threads. I would like to let more than one thread reading at the same time and just one for the writing
>
Multiple threads and even applications can read the same file at the same time; it is writing that is problematic.
There is nothing in what you posted that even shows any 'file' manipulation so no comments can be made about that.
It looks like you took those quotes from this Java Tutorial Page on Synchronizeds Methods
http://docs.oracle.com/javase/tutorial/essential/concurrency/syncmeth.html
Those quotes are accurate as far as synchronizing a particular instance is concerned but that would not prevent some other code from trying to read/write the same file. But again, you code doesn't even include any file-related objects that you are trying to control access to.
See the Java Tutorial section on 'Lock Objects'
http://docs.oracle.com/javase/tutorial/essential/concurrency/newlocks.html

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I will attach also some pictures just to be maybe more clear...
Attachments:
Implementation_pictures.zip ‏368 KB

I wasn't looking at your Sequence, I was looking at Receive_HDL_Block.JPG. What is that VI doing (the one with number 3 on the icon and Size_in_bytes as an input) ?
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Sorry to be so blunt.
Regards
Ray Farmer
Regards
Ray Farmer

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Hello Frens,
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Hi,
Have a look into these blogs and links
/people/sudharshan.aravamudan/blog/2005/12/01/illustration-of-multi-mapping-and-message-split-using-bpm-in-sap-exchange-infrastructure
http://help.sap.com/saphelp_nw04/helpdata/en/de/766840bf0cbf49e10000000a1550b0/content.htm
you can design the ccBPM. To know more about Correlation -with e.g
http://help.sap.com/saphelp_nw2004s/helpdata/en/0e/56373f7853494fe10000000a114084/content.htm
/people/sravya.talanki2/blog/2005/08/24/do-you-like-to-understand-147correlation148-in-xi
/people/pooja.pandey/blog/2005/07/27/idocs-multiple-types-collection-in-bpm
/people/sriram.vasudevan3/blog/2005/01/11/demonstrating-use-of-synchronous-asynchronous-bridge-to-integrate-synchronous-and-asynchronous-systems-using-ccbpm-in-sap-xi
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http://help.sap.com/saphelp_nw04/helpdata/en/a5/64373f7853494fe10000000a114084/content.htm
i hope this will help you.
Regards
Aashish Sinha
PS : reward points if helpful

Problem in synchronizing two executions

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