io: add ability to set a name for IO channels
The GSource object has ability to have a name, which is useful when debugging performance problems with the mainloop event callbacks that take too long. By associating a name with a QIOChannel object, we can then set the name on any GSource associated with the channel. Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
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