Date: Fri, 06 Jun 2003 12:39:43 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: "M. Warner Losh" <imp@bsdimp.com> Cc: freebsd-hackers@freebsd.org Subject: Re: interrupt handlers in -current Message-ID: <XFMail.20030606123943.jhb@FreeBSD.org> In-Reply-To: <20030605.181430.22017364.imp@bsdimp.com>
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On 06-Jun-2003 M. Warner Losh wrote: > In message: <XFMail.20030606002657.dmlb@dmlb.org> > Duncan Barclay <dmlb@dmlb.org> writes: >: >: On 05-Jun-2003 M. Warner Losh wrote: >: > In message: <XFMail.20030605220236.dmlb@dmlb.org> >: > Duncan Barclay <dmlb@dmlb.org> writes: >: >: This is more of a confirmation of my understanding than anything else. >: >: In -current, should an interrupt thread be created you set up an interrupt >: >: handler? If so, then I'd better check my code because I haven't got one! >: > >: > No. Just because we handle interrupts in a thread doesn't mean client >: > devices need to create a thread. The thread is creted automatically >: > and the routine passed to bus_setup_intr() is then called when an >: > interrupt happens. >: >: Rereading what I wrote, I might have mistyped and asked the wrong question. >: >: I think what you saying is that bus_setup_intr() doesn't create the thread, >: (in the sense of it appear in ps -ax?) >: but a thread is created automatically when the first interrupt occurs? > > The thread is created right away. However, if this interrupt is > shared with another device, you'll see seomthing like: > > root 23 0.0 0.0 0 12 ?? WL 11:35AM 0:04.24 (irq10: cbb0 cbb1++) > > which says taht cbb0 and cbb1 (and others) share irq10. The thread is created right away, but I think KSE broke ps/top in that they don't show new processes anymore that haven't run yet. This is definitely a bug in the kernel. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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