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From: Yong Fan <yong.fan@exar.com>
To: John Baldwin <jhb@freebsd.org>, "freebsd-drivers@freebsd.org"
	<freebsd-drivers@freebsd.org>
Date: Tue, 20 Mar 2012 09:43:23 +0800
Thread-Topic: How can I decide whether my code is running in interrupt
	context or not?
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Cc: "drivers@FreeBSD.org" <drivers@freebsd.org>
Subject: RE: How can I decide whether my code is running in interrupt
 context or not?
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Thanks your warm reply.
I see.

Thanks
Yongfan

-----Original Message-----
From: John Baldwin [mailto:jhb@freebsd.org]
Sent: Monday, March 19, 2012 7:24 AM
To: freebsd-drivers@freebsd.org
Cc: Yong Fan; drivers@FreeBSD.org
Subject: Re: How can I decide whether my code is running in interrupt conte=
xt or not?

On Thursday, March 15, 2012 10:06:13 pm Yong Fan wrote:
> Hi all,
>
> In Linux, I can use in_interrupt() function.
> FreeBSD has such a similar kernel function for drivers?

Hmm, we do not, though the only part of your driver that can run in primary
interrupt context is an interrupt filter.  If you mean interrupt-thread
context (i.e. when sleeping is not permitted), then that would apply to you=
r
normal interrupt handler and any callout routines that you have.

--
John Baldwin

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