How to know if all pending tevent_req requests have completed?

[Amitay Isaacs]

On Thu, Feb 23, 2017 at 11:39 AM, Jeremy Allison <jra at samba.org> wrote:

> On Thu, Feb 23, 2017 at 11:18:41AM +1100, Amitay Isaacs wrote:
> > Hi tevent experts,
> >
> > tevent_req_poll() allows to wait for a specific request.
> >
> > If I want to create n requests and wait for all of them to finish, is
> there
> > an easy way to do it?
> >
> > Here is an example computation:
> >
> > run_event_send()
> >    ... run scripts one after the other ...
> >
> >    if (timer expires) {
> >       run_debug_send()
> >       tevent_req_done()
> >    }
> >
> > In this case, run_debug_send() computation is *not* hanging off the
> > run_event_send() request.
> > The calling code needs to know that run_event computation has timed out,
> > but doesn't really care whether debugging computation is over or not.
> The
> > debug program can run in the background and log useful debug information
> > without affecting the caller.
>
> Can't you use tevent_wakeup_send() to set a timeout on the
> tevent context, and then check the state of each req you've
> saved off in a list somewhere by using tevent_req_is_in_progress() ?
>

Well, the requests could created any at level, so keeping track of them
might not be feasible without layering violations.

I was really hoping that event context keeps track of active requests and I
can query the event context if the requests list (or queue) is empty or not.

Amitay.