[PATCH] lib/tevent: Add trace point callback

[Martin Schwenke]

On Fri, 08 Jun 2012 08:10:42 +0200, "Stefan (metze) Metzmacher"
<metze at samba.org> wrote:

> > Set/get a single callback function to be invoked at various trace
> > points.  Define "before wait" and "after wait" trace points - more
> > trace points can be added later if required.
> > 
> > CTDB wants this to log long waits and events.
> > 

> Can you please remove the globals and put them into struct tevent_context,
> please add a sub struct 'tracing' similar to 'nesting'.

I was initially concerned that changing struct tevent_context might
introduce a gross ABI change.  So we opted for a 1/2 way solution where
the globals could be moved into struct tevent_context later on without
a change to the function API.  However, you're right... it much better
to have them in struct tevent_context to start with...

Done, attached, pushed...

  http://git.ozlabs.org/?p=martins-samba.git;a=shortlog;h=refs/heads/tevent-wip

I've successfully tested this code in CTDB.

Thanks...

peace & happiness,
martin
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