Subject: Re: how to avoid re-ordering?
To: YAMAMOTO Takashi <yamt@mwd.biglobe.ne.jp>
From: Richard Earnshaw <rearnsha@buzzard.freeserve.co.uk>
List: tech-kern
Date: 12/17/2001 11:42:34 
Your barrier would be better if it had a "clobber memory" attribute:

  asm volatile ("" : : : "memory");

R.