linux-kernel - Re: [PATCH 0/2] eventfd: new EFD

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Message-ID: <4A92DC93.6030406@redhat.com>
Date:	Mon, 24 Aug 2009 21:31:47 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Davide Libenzi <davidel@...ilserver.org>
CC:	"Michael S. Tsirkin" <mst@...hat.com>, gleb@...hat.com,
	kvm@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] eventfd: new EFD_STATE flag

On 08/24/2009 09:25 PM, Davide Libenzi wrote:
> Indeed, the default eventfd behaviour is like, well, an event. Signaling
> (kernel side) or writing (userspace side), signals the event.
> Waiting (reading) it, will reset the event.
> If you use EFD_SEMAPHORE, you get a semaphore-like behavior.
> Events and sempahores are two widely known and used abstractions.
> The EFD_STATE proposed one, well, no. Not at all.
>    

There are libraries that provide notifications (or fire watches) when 
some value changes.  They're much less frequently used than events or 
semaphores, though.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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