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Set execution priority of AX control?

Posted on 2006-11-12
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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  
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Question by:odissey1
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Russell Libby earned 600 total points
ID: 17930272

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

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