Re: [Xen-devel] [XEN PATCH for-4.13 v2 1/6] libxl: Introduce libxl__ev_child_kill_deregister

[Ian Jackson <ian.jackson@xxxxxxxxxx>]

Anthony PERARD writes ("[XEN PATCH for-4.13 v2 1/6] libxl: Introduce 
libxl__ev_child_kill_deregister"):
> Allow to deregister the callback associated with a child death event.
> 
> The death isn't immediate will need to be collected later, so the
> ev_child machinery register its own callback.
> 
> libxl__ev_child_kill_deregister() might be called by an AO operation
> that is finishing/cleaning up without a chance for libxl to be
> notified of the child death (via SIGCHLD). So it is possible that the
> application calls libxl_ctx_free() while there are still child around.
> To avoid the application getting unexpected SIGCHLD, the libxl__ao
> responsible for killing a child will have to wait until it has been
> properly reaped.

Very good.

Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>

Thanks,
Ian.

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