Re: [Libguestfs] libnbd: When are callbacks freed
On Thu, Jul 13, 2023 at 07:07:33PM +0000, Tage Johansson wrote:
Does this mean that the call to `aio_notify_read()` or
`aio_notify_write()` which discovered the error will also return the
error?
Yes!
And that the completion callback was called by that call to
`aio_notify_*`, in the same thread and before the call to
`aio_notify_*` returned?
I believe so, although I don't think the contract requires this. For
example it would seem to be contractually valid to not call the
completion callback until much later, eg. nbd_close.
Also, in addition to what Eric said in his reply, it is also possible
for callbacks to set the error int (through the pointer) in order to
cause an error to be returned.
Rich.
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