linux-kernel - Re: [PATCH][RFC] time: add wait_interruptible_timeout macro to sleep (w. timeout) until wake

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Date:	Sat, 27 Feb 2010 10:33:46 +0100
From:	Rafał Miłecki <zajec5@...il.com>
To:	Rafał Miłecki <zajec5@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	DRI <dri-devel@...ts.sourceforge.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][RFC] time: add wait_interruptible_timeout macro to sleep 
	(w. timeout) until wake_up

W dniu 26 lutego 2010 20:01 użytkownik Ville Syrjälä <syrjala@....fi> napisał:
> Disabling the condition check doesn't make sense.
>
> You could use a completion.
>
> init_completion(vbl_irq);
> enable_vbl_irq();
> wait_for_completion(vbl_irq);
> disable_vbl_irq();
> and call complete(vbl_irq) in the interrupt handler.
>
> The same would of course work with just some flag or counter
> and a wait queue.

Ouch, I can see it gone bad already.

Firstly I simply just wanted to avoid condition in wait_event_*. It
looked unnecessary as I got interrupts (signals). So I started playing
with other solutions (like my wait_interruptible_timeout where I had
not full understanding of waking up) and finally started analyzing
over-complex things like completions.

I'll just use some one more variable and some more basic solution.

Thanks for help and sorry for taking your time. I hope to provide at
least some of you dynamic radeon PM in return :)

-- 
Rafał
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