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RE: [Xen-devel] [PATCH] xenbus: add missing wakeup in concurrent read/wr

To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
Subject: RE: [Xen-devel] [PATCH] xenbus: add missing wakeup in concurrent read/write
From: "Jun Zhu (Intern)" <Jun.Zhu@xxxxxxxxxx>
Date: Wed, 8 Sep 2010 11:51:12 +0100
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Thread-topic: [Xen-devel] [PATCH] xenbus: add missing wakeup in concurrent read/write
That's right!  Thanks.

Jun Zhu
Citrix Systems UK
From: Jeremy Fitzhardinge [jeremy@xxxxxxxx]
Sent: 07 September 2010 19:34
To: Daniel De Graaf
Cc: xen-devel; Jun Zhu (Intern)
Subject: Re: [Xen-devel] [PATCH] xenbus: add missing wakeup in concurrent 

 On 09/08/2010 01:42 AM, Daniel De Graaf wrote:
> If an application has a dedicated read thread watching xenbus and
> another thread writes an XS_WATCH message that generates a synthetic
> "OK" reply, this reply will be enqueued in the buffer without waking up
> the reader. This can cause a deadlock in the application if it then
> waits for the read thread to receive the queued message.
> Signed-off-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>

Thanks.  Jun Zhu, does this fix the problem you were reporting?


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