Solved

Set execution priority of AX control?

Posted on 2006-11-12
2
241 Views
Last Modified: 2010-04-05
Hi Experts,

I have AX control, which controls a digital camera and saves images as JPEG (1 image per second). This JPEG compression loads my CPU significantly and occasionally hangs more important process of CONTINUOUS data acquisition from ADC cards. It would be nice if JPEG compression was performed in a low-priority thread, and won't obstruct more important tasks. AX support said that this AX contol is multithreaded but the source code ids not available for me (proprietary).

Q1:  Is it possible to assign lower priority execution for an AX control in my application? For example if I put AX.SaveAsJPEG(...) inside my own thread (with low priority), is it going to lower execution priority of the actual code inside AX control?
 
Q2:  I can put this AX control in a separate imaging program and assign lower priority for that program, but will it going to lower actual priority of the JPEG compresion thread inside this AX control?  

sincerely,
odissey1  
0
Comment
Question by:odissey1
2 Comments
 
LVL 26

Accepted Solution

by:
Russell Libby earned 200 total points
Comment Utility

Q1. If the AX control is doing the work in its own thread, then trying to exec the calls in another thread isn't going to buy you anything (plus, it makes it tricky with marshalling the object to another thread to make the call anyways.). Its the thread priority for the AX control that needs to be modified, so unless you can uniquely identify *which* thread that is, then this is not a viable option.

Q2. Yes. A threads BASE priority is determined by (a) the Thread's priority combined with (b) The thread's process priority. You could try one of 2 values for the SetPriorityClass call:

If Win2k and up, I would recommend:

BELOW_NORMAL_PRIORITY_CLASS
$00004000  
Process that has priority above IDLE_PRIORITY_CLASS but below NORMAL_PRIORITY_CLASS. (Windows NT and Windows Me/98/95:  This value is not supported.)

also could try:

IDLE_PRIORITY_CLASS
$00000040
Process whose threads run only when the system is idle. The threads of the process are preempted by the threads of any process running in a higher priority class. An example is a screen saver.

---

Regards,
Russell

0

Featured Post

How to run any project with ease

Manage projects of all sizes how you want. Great for personal to-do lists, project milestones, team priorities and launch plans.
- Combine task lists, docs, spreadsheets, and chat in one
- View and edit from mobile/offline
- Cut down on emails

Join & Write a Comment

Hello everybody This Article will show you how to validate number with TEdit control, What's the TEdit control? TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text. Usua…
Introduction I have seen many questions in this Delphi topic area where queries in threads are needed or suggested. I know bumped into a similar need. This article will address some of the concepts when dealing with a multithreaded delphi database…
Sending a Secure fax is easy with eFax Corporate (http://www.enterprise.efax.com). First, Just open a new email message.  In the To field, type your recipient's fax number @efaxsend.com. You can even send a secure international fax — just include t…
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

13 Experts available now in Live!

Get 1:1 Help Now