[Xen-devel] FW: Cancelling asynchronous operations in libxl

[Simon Beaumont <simon.beaumont@xxxxxxxxxx>]

We're in the process of porting xenopsd[1] to libxl, rather than driving libxc 
manually.

Using our libxc-based backend, we are able to cancel operations. For operations 
that are using XenStore watches we wrap these in a cancellable_watch[2], and 
for operations that make use of a subprocess we send SIGKILL when we wish to 
cancel the associated task. We would then instrument any necessary cleanup by 
hand on a best-effort basis.

With the move to libxl, a lot of this control will be abstracted away and it is 
unclear how best to allow long-running tasks to be cancelled. It seems most of 
these operations could be executed asynchronously but we wonder if it is 
possible to cancel them, or how we could add cancellation functionality to 
these operations?

Cheers,

Si

[1]: https://github.com/xapi-project/xenopsd
[2]: https://github.com/xapi-project/xenopsd/blob/master/xc/cancel_utils.ml#L101

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