linux-kernel - Re: preempt_disable and sleep()

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Message-ID: <1273776201.11899.23.camel@sven.thebigcorporation.com>
Date:	Thu, 13 May 2010 11:43:21 -0700
From:	Sven-Thorsten Dietrich <thebigcorporation@...il.com>
To:	ratheesh k <ratheesh.ksz@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: preempt_disable and sleep()

On Fri, 2010-05-14 at 00:02 +0530, ratheesh k wrote:
> I am running RT linux .
> 
> /* code snippet */
> 
> preempt_disable()
> ...........
> sleep(10);
> '............
> preempt_enable()
> 
> 
> will this sleep() will cause reschedule ?.
> 

Why would you do this?

If you had tried this code, you would have seen the corresponding stack
dump on the console.

> if an interrupt comes  while premption is disabled , how it is handled ?.
> 

Depends on the number of (idle) cores, the setting of CONFIG_PREEMPT_[]
and the type of interrupt.

RT threaded IRQs would not run until preemption is enabled on a single
core system.



> Thanks,
> Ratheesh
> --
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