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List:       freebsd-hackers
Subject:    Re: Context Switch
From:       Hans Ottevanger <hans () beastielabs ! net>
Date:       2012-03-30 14:20:12
Message-ID: 4F75C11C.3060002 () beastielabs ! net
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On 03/30/12 15:36, Giovanni Trematerra wrote:
> On Thu, Mar 29, 2012 at 7:18 PM, Mahesh Babu<maheshbabu90@yahoo.co.in>  wrote:
> > Which part of the source code in FreeBSD 9 is responsible for making context \
> > switching i.e. storing and restoring the process state. 
> 
> Context switch is split up in machine indipendent code (MI Code) and
> machine dependent code (MD Code)
> 
> For MI part take a look at
> mi_switch in sys/kern/kern_sync.c
> sched_switch in sys/kern/sched_ule.c and sys/kern_4bsd.c depending on
> configurated scheduler in the kernel config file.
> 
> For MD part search for symbol cpu_switch inside the specific arch directory.
> 

For background information you could read "The Book" (a bit dated but 
still quite relevant):

http://www.informit.com/store/product.aspx?isbn=0201702452

And you are especially lucky, since the chapter that is the most 
relevant to you is freely available on-line:

http://www.informit.com/articles/article.aspx?p=366888


Kind regards,

Hans Ottevanger
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