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From: Hans Petter Selasky <hselasky@freebsd.org>
To: Andriy Gapon <avg@freebsd.org>
Date: Mon, 29 Aug 2011 16:27:42 +0200
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Subject: Re: svn commit: r223989 - head/sys/dev/usb/input
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On Monday 29 August 2011 15:25:08 Andriy Gapon wrote:
> Another question - why ukbd_yield() is needed?
> Why kern_yield() would not be good here?
> What are the priority manipulations in ukbd_yield?
> Not saying that the code is incorrect, just that this is not explained in
> the commit message.
This is needed during mountroot prompt, to allow the worker threads of the USB
code to run, because the mountroot code is like:
while (1) {
cngetc();
}
instead of:
while (1) {
cngetc();
pause("WAIT_A_BIT", 1);
}
--HPS