xs_unwatch

xs_unwatch

[Shakil k]

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Hello Xen Team,

I wanted to use the xenstore API to monitor the change of value for one of
the node, being written by xenstore-write.
I can use xs_watch to look for the value change in node, however if suppose
the client who is suppose to update the value to node died, so I don't want
to keep waiting forever, hence I want a timeout for watch.
I thought probably I can do xs_unwatch after certain defined timeout but
somehow its not working.
Is there a way to specify timeout to watch, rather than just n iterations?

Thanks for the help.

Regards
Shakil

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Re: xs_unwatch

[Ian Campbell]

On Thu, 2013-08-15 at 14:52 -0700, Shakil k wrote:
> Hello Xen Team,
> 
> 
> I wanted to use the xenstore API to monitor the change of value for
> one of the node, being written by xenstore-write.
> I can use xs_watch to look for the value change in node, however if
> suppose the client who is suppose to update the value to node died, so
> I don't want to keep waiting forever, hence I want a timeout for
> watch.
> I thought probably I can do xs_unwatch after certain defined timeout
> but somehow its not working.
> Is there a way to specify timeout to watch, rather than just n
> iterations?

watches are in place until you unwatch, there is no concept of either
timeouts or n-iterations.

You would have to implement this in your client, by select()ing (or poll
etc) on the xenstore fd with a timeout and managing the xs_unwatch
yourself.

Ian.

> 
> 
> Thanks for the help.
> 
> 
> Regards
> Shakil
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