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Re: [Xen-devel] [PATCH] xenbus: add missing wakeup in concurrent read/wr
| To: | Daniel De Graaf <dgdegra@xxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] xenbus: add missing wakeup in concurrent read/write |
| From: | Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
| Date: | Wed, 08 Sep 2010 09:34:08 +1000 |
| Cc: | "Jun Zhu \(Intern\)" <Jun.Zhu@xxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Tue, 07 Sep 2010 16:34:40 -0700 |
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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?
J
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