[libvirt] [PATCH v2 0/5] delete volumes while it is building

[Guannan Ren <gren redhat com>]

This is the version 2 of patches for deleting volume while it is being built.
based on the first version: https://www.redhat.com/archives/libvir-list/2011-July/msg00535.html.

The patches is an attempt to spawn a new thread for volume building in storageVolumeCreateXML(),
then, the initial thread is waiting for the cancelling signal from storageVolumeDelete().
When it gets the signal, it uses pthread_cancel() to stop the process of volume building, then tell
storageVolumeDelete() to continue its job.

I go through the codes in other parts of libvirt briefly, such as nodedevice, network. It is rare
to spawn a new thread, so this worth a shot or probably not.
Any idea is appreciated.