linux-kernel - Re: Question: schedule()

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Message-ID: <45ED30E5.9040105@stud.feec.vutbr.cz>
Date:	Tue, 06 Mar 2007 10:14:13 +0100
From:	Schmidt Michal <xschmi00@...d.feec.vutbr.cz>
To:	Mockern@...dex.ru
CC:	linux-kernel@...r.kernel.org
Subject: Re: Question: schedule()

Mockern wrote:
> Hi,
> 
> What does schedule() function do? I want to make my kthread preemptive.

It makes a scheduling decision, i.e. it assigns the CPU time to a
suitable runnable task. If called with the current task's state set to 
TASK_(UN)INTERRUPTIBLE, it puts the task to sleep.
Kernel threads are preemptible if the kernel is configured with 
CONFIG_PREEMPT.
What exactly are you trying to do?

If you're new to Linux kernel programming, I suggest you read Robert
Love's book "Linux Kernel Development".
"Linux Device Drivers" by J.Corbet, A.Rubini and G.Kroah-Hartman will be
very helpful too and it is available online: http://lwn.net/Kernel/LDD3/

Michal
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