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

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Message-ID: <20090804085406.GA3311@redhat.com>
Date:	Tue, 4 Aug 2009 11:54:06 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	davidel@...ilserver.org, gleb@...hat.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH-RFC 2/2] eventfd: EFD_STATE flag

On Tue, Aug 04, 2009 at 11:53:03AM +0300, Avi Kivity wrote:
> On 08/03/2009 07:57 PM, Michael S. Tsirkin wrote:
>>> Why not do it at the point of the write?
>>>
>>>      if (value != ctx->count) {
>>>          ctx->count = value;
>>>          wake_things_up();
>>>      }
>>>      
>>
>> What if write comes before read?
>>    
>
> The read will get the new value.

Yes :) But how does read know it should not block?

> -- 
> error compiling committee.c: too many arguments to function
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