linux-kernel - Re: Sleeping thread not receive signal until it wakes up

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Date:	Wed, 7 Mar 2007 16:40:13 -0800
From:	"Luong Ngo" <luong.ngo@...il.com>
To:	"Lee Revell" <rlrevell@...-job.com>
Cc:	"linux-os (Dick Johnson)" <linux-os@...logic.com>,
	"Linux kernel" <linux-kernel@...r.kernel.org>
Subject: Re: Sleeping thread not receive signal until it wakes up

On 3/7/07, Lee Revell <rlrevell@...-job.com> wrote:
> On 3/7/07, linux-os (Dick Johnson) <linux-os@...logic.com> wrote:
> > Interruptible_sleep_on is interruptible, but for your task to
> > actually be awakened and your alarm handler to get some CPU,
> > it needs to be scheduled. If the BKL (big kernel lock) is
> > held, it won't be scheduled until it is released.
>
> You can schedule while holding the BKL and it will be dropped and reacquired.
>
> Lee
>


My hardware is PowerPC architecture. Does it have any thing to do with
the kernel locking? Also, I saw CONFIG_LOCK_KERNEL,
CONFIG_PREEMPT_BKL ans CONFIG_SMP in the file
include/linux/smp_lock.h, or CONFIG_PREEMPT  in lib/kernel_lock.c and
I don't have any of these macro defined, would that be the reason. I
could not find where these option when running make menuconfig either.


Thanks,
LNgo
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