linux-kernel - Re: Hi, I have one question about rt

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Message-ID: <46445EB9.8040106@redhat.com>
Date:	Fri, 11 May 2007 08:16:57 -0400
From:	Steven Rostedt <srostedt@...hat.com>
To:	Li Yu <raise.sail@...il.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Esben Nielsen <nielsen.esben@...glemail.com>
Subject: Re: Hi, I have one question about rt_mutex.

Li Yu wrote:
> 
> However, I found the sys_futex() do not use rt_mutex, so what's mean of the user futex you said?
> Even, I have not found any usage for rt_mutex in kernel code. Or, some beautiful story will happen in future?
> 

Just need to look a little deeper :-)


sys_futex calls do_futex

do_futex with the option of FUTEX_LOCK_PI will call futex_lock_pi

futex_lock_pi calls rt_mutex_timed_lock or rt_mutex_trylock  both of
which are part of the rtmutex.c code.


So it's there today :-)

-- Steve

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