Re: [patch 1/4] prepare_to_wait/finish_wait sleep/wakeup API

[Linus Torvalds]

On Wed, 25 Sep 2002, David S. Miller wrote:
> 
> Ok, so if the condition retest fails at wakeup (someone got to the
> event before us), it's ok because we add ourselves back to the wait
> queue first, mark ourselves as sleeping, _then_ retest.

Right. The looping case (if somebody else was first) is slowed down
marginally, but the common case is sped up and needs one less time through
the waitqueue lock.

		Linus