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xen-devel
Re: [Xen-devel] help with xenstored 'hang'
Patrick Colp wrote:
> On 1 July 2010 14:30, Jim Fehlig <jfehlig@xxxxxxxxxx> wrote:
>
>> Patrick Colp wrote:
>>
>>> I was recently struggling with what sounds like a not-too-dissimilar
>>> problem while working with a disaggregated version of xenstore. The
>>> ultimate solution for me was to disable pthreads in xenstore/libxs. I
>>> just commented out the following line in tools/xenstore/Makefile:
>>>
>>> xs.opic: CFLAGS += -DUSE_PTHREAD
>>>
>>> After I removed that line and rebuilt and installed xenstore, it
>>> worked just fine. I would be curious to know if this also solves your
>>> problem.
>>>
>>>
>> After more thought, this seems like it could cause problems in xend,
>> which is multi-threaded. This change essentially make the xenstore
>> client library thread-unsafe correct?
>>
>
> I don't think so. I think it just makes the xenstore library single
> threaded.
Right. But AFAICT, multiple threads in xend could use the single
xs_handle, allowing these threads to write to the handle's fd
simultaneously. With the pthreads impl, these threads must acquire the
handle's req_mutex before writing.
> In my case, I was using a single threaded application and
> still ran into this problem, as the xenstore library seems to have
> multiple threads.
It spawns one reader thread only. Requests and responses are handled on
the caller's thread of control.
Regards,
Jim
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