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Date: Wed, 7 Aug 2002 00:15:24 -0700 (PDT)
From: Hiten Pandya <hitmaster2k@yahoo.com>
Reply-To: hiten@uk.FreeBSD.org
Subject: Re: mutex in kernel modules?
To: Ed Yu <edlyu@yahoo.com>, freebsd-hackers@freebsd.org
In-Reply-To: <20020806182343.89911.qmail@web20702.mail.yahoo.com>
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--- Ed Yu <edlyu@yahoo.com> wrote:
> Hi, what mutex is available when writing kernel
> modules? I want something like declaring of
> "semaphore" and be able to lock and unlock it. I found
> simplelock in <sys/lock.h>. I saw some modules using
> struct mtx but I couldn't find it anywhere in the
> header files. Man pages for both of them do not show
> anything. I'm running FreeBSD-stable. Any help would
> be greatly appreciated. Thank you.

You cannot have mutexes in FreeBSD-STABLE.  All the Premptive Multitasking
and the related jazz is being done in FreeBSD-CURRENT.  Please checkout:

  http://www.FreeBSD.org/smp -- Information about Locking and stuff
  http://www.lemis.com/~grog/SMPng/AOSS2/index.html -- FreeBSD SMP Article

And you can checkout the man pages mutex(9), sx(9), mtx_pool(9), sema(9)
etc. at:

http://www.freebsd.org/cgi/man.cgi?query=&manpath=FreeBSD+5.0-current

This is the web interface to the FreeBSD 5.0 Manual Pages.

Hope this helps.

  -- Hiten

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