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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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| Acceptlanguage: | en-US |
| Cc: | xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Wed, 08 Sep 2010 03:54:30 -0700 |
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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
read/write
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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