linux-kernel - Re: problem with <asm/semaphore.h>

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Date:	Sat, 21 Apr 2007 16:57:36 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	liangbowen <liangbowen@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: problem with <asm/semaphore.h>

liangbowen wrote:
> maybe you've misunderstood my meaning.  I mean the whole <asm/
> semaphore.h> header file has only  4 lines of code in total:
> #ifndef I386_SEMAPHORE_H
> #define I386_SEMAPHORE_H
> #include <linux/linkage.h>
> #endif
> 
> it's supposed to have more codes than that. like
> struct semaphore {
> 	int count;
> 	int waking;
> 	int lock ;			/* to make waking testing atomic */
> 	struct wait_queue * wait;
> };
> and the down(), up() functions.
> 
> but I can't see any of those codes, not even the #ifdef __KERNEL__
> macro.
> 

It does in the kernel version of that header. The userspace version of 
that header has everything inside #ifdef __KERNEL__ stripped out.

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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