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

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Message-ID: <4A91737E.5080807@gnu.org>
Date:	Sun, 23 Aug 2009 18:51:10 +0200
From:	Paolo Bonzini <bonzini@....org>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	Avi Kivity <avi@...hat.com>,
	Davide Libenzi <davidel@...ilserver.org>, 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 08/23/2009 04:30 PM, Michael S. Tsirkin wrote:
> On Sun, Aug 23, 2009 at 04:40:51PM +0300, Avi Kivity wrote:
>> On 08/23/2009 04:36 PM, Michael S. Tsirkin wrote:
>>> More important here is realization that eventfd is a mutex/semaphore
>>> implementation, not a generic event reporting interface as we are trying
>>> to use it.
>>>
>>
>> Well it is a generic event reporting interface (for example, aio uses it).
>
> Davide, I think it's a valid point.  For example, what read on eventfd
> does (zero a counter and return) is not like any semaphore I saw.

It is similar to Win32 events (which can be used like contorted mutexes 
to sync two processes).

Paolo
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