[libvirt] In libxl_driver, how to lock/unlock objects while doing an operation that runs for a long time?

[Oscar Ben]

In the discussion :
         http://thread.gmane.org/gmane.comp.emulators.libvirt/53534

People mentioned about long-term operations' LOCKs there. It seems that, in
libxl_driver, certain opeations may hold a lock for too long, thus other
operations, even those just do query jobs, would be blocked.

In qemu_driver, there seems to be a more complexy way to solve this
problem, by employing a condition variable.

My question is :
   Is "Fixing such problem in libxl_driver" in our todo-list?
   If yes, what's the detailed solution? Will that be similar to qemu's
CONDITION VARIABLE method?
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