[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] fix race condition between libvirtd event handling and libxl fd deregister
Ian Jackson wrote: > Ian Campbell writes ("Re: [PATCH] fix race condition between libvirtd event > handling and libxl fd deregister"): > >> I took Bamvor's most recent response to mean that a per-event lock was >> already in place in libvirt and inferred that this was the reason why >> the originally proposed one line fix worked for them. Perhaps I >> misunderstood? >> > > Yes, I think that's what Bamvor meant but I don't think it's correct > that such a lock eliminates the race. libvirt has to release that > lock before making the callback (to follow the libxl locking rules > which are necessary to avoid deadlock). > And it does. The event loop lock is released just before invoking the callback, and re-acquired just after the callback returns. Jim _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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