linux-kernel - Re: [patch] doc: add a chapter about trylock functions [Bug 9011]

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Message-Id: <1210940485.7886.29.camel@twins>
Date:	Fri, 16 May 2008 14:21:25 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Matti Linnanvuori <mattilinn@...il.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [patch] doc: add a chapter about trylock functions [Bug 9011]

On Thu, 2008-05-15 at 10:30 +1000, Rusty Russell wrote:
> On Wednesday 14 May 2008 01:31:47 Matti Linnanvuori wrote:
> > +    <function>mutex_trylock()</function> does not suspend your task
> > +    but returns non-zero if it could lock the mutex on the first try
> > +    or 0 if not. This function cannot be safely used in hardware or
> > +    software interrupt contexts despite not sleeping.
> 
> I know this is what the documentation says, but I can't see why.  Ingo?

because who would then own the lock?

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