[PATCH] lib/tevent: Add trace point callback

[Stefan (metze) Metzmacher]

Hi Martin,

> 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.
> 
> ================================
> 
> * There's a prerequisite patch that adds a tevent_context* to
>   poll_event_context.  This makes all backends consistent.
> 
> * I've been back and forth with Volker a few times to get the patch
>   into its current state.
> 
> Patches also in my git repo at:
> 
>   http://git.ozlabs.org/?p=martins-samba.git;a=shortlog;h=refs/heads/tevent-wip


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

metze

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