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Date: Sat, 09 Jul 2005 10:18:19 -0700
From: Sam Leffler <sam@errno.com>
Organization: Errno Consulting
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To: ming fu <fming@borderware.com>
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Cc: freebsd-net@freebsd.org
Subject: Re: what to replace splnet in FreeBSD 5.x?
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ming fu wrote:
> Hi,
> 
> With splnet() became a no-op in sys/systm.h
> 
>    static __inline intrmask_t    splnet(void)        { return 0; }
> 
> What should I use to replace the splnet?
> 
> I have a module receiving input from both ip_input() and a device that 
> userland can write to. I guess I was cover from the ip_input() as it 
> should have the proper lock. However, I am on my own to figure out what 
> to replace the splnet() when receive from the device from the userland.  
> It uses splnet() in FreeBSD 4.x.

spl's lock execution threads.  5.x and later systems mostly lock data 
structures using mtx's (there are a very few exceptions).  Thus there 
isn't necessarily a direct replacement, you usually need to rethink your 
locking/synchronization strategy.

	Sam