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Re: Problem with timer when a USB device is connected

Subject: Re: Problem with timer when a USB device is connected
From: Garth Cummings <email@hidden>
Date: Mon, 12 Mar 2007 10:35:58 -0700
Delivered-to: email@hidden
Delivered-to: email@hidden

Hi Adarsh,

On Mar 9, 2007, at 1:31 AM, Adarsh wrote:

Hello Group,

We are developing a KEXT for a USB device. Our driver uses a timer with a time interval of 6 ms to do the data processing. The problem is whenever any other USB device is plugged-in, the timer gets delayed.

Why are you using a timer? This isn't usually a good approach on Mac OS X. Mac OS X is not a real-time operating system.

Is this a normal behavior?

Yes.

How can we avoid this delay?

Get rid of the timer.

--gc

____________________________________________________________________

Garth Cummings email@hidden

Sr. Software Engineer

Apple Developer Technical Support

<http://developer.apple.com/technicalsupport>

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	>Problem with timer when a USB device is connected (From: Adarsh <email@hidden>)

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