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Date: Sun, 25 Feb 2001 10:52:08 -0800 (PST)
From: Davide Libenzi <davidel@xmailserver.org>
To: Fabrice Peix <Fabrice.Peix@sophia.inria.fr>
Subject: RE: sched_yield
Cc: KML <linux-kernel@vger.kernel.org>
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On 25-Feb-2001 Fabrice Peix wrote:
> 
> 
> 
>       Yop,
> 
>       Just a newbie question ...
>       Why sys_sched_yield don't call schedule ?
>       
>       
>       man page of sched_yield tell : 
> 
>       "A  process  can relinquish the processor voluntarily 
>       without blocking by calling sched_yield.  
>       The process will then be moved to the end 
>       of the queue for its static priority and 
>       a new process gets to run."
>       

It sets, under certain conditions ( nr_running ), the variable need_resched
and, in the system call return code this value is checked and schedule() is
called.
Look at sched.c and entry.S.



- Davide

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