[erlang-questions] : : driver_entry stop() and driver_async() interaction

Raimo Niskanen <>
Thu Dec 18 16:54:26 CET 2008


On Thu, Dec 18, 2008 at 06:41:31AM -0600, Paul Fisher wrote:
> Any word on this?

Sorry, no. I will try to summon an internal meeting about this...

> 
> 
> Raimo Niskanen wrote:
> > On Thu, Nov 06, 2008 at 12:22:45PM -0600, Paul Fisher wrote:
> >> Can anyone comment on this question i sent a few weeks ago?
> >>
> >> When the port owner terminates and there are driver_async() requests 
> >> scheduled and not yet executed, I am seeing them outstanding at the time 
> >> of the stop() callback.
> > 
> > We will take a look at it and make it clear in some
> > documentation and give you an answer. It will take a bit of
> > code review to be certain...
> > 
> >>
> >> Paul Fisher wrote:
> >>> Question about work scheduled on async threads via driver_async() and
> >>> still pending (i.e. they are still on the queue to be executed,) when
> >>> the stop() callback is invoked.  Specifically, assuming smp w/async
> >>> thread pool and the driver marked ERL_DRV_FLAG_USE_PORT_LOCKING.
> >>>
> >>> Is it the responsibility of the code in the stop() callback to call
> >>> driver_async_cancel() on each outstanding async work item, or will this
> >>> be done automatically by the emulator before the call to stop()?
> >>>
> >>> If this is the responsibility of the code in stop(), is it guaranteed
> >>> that no async work item will be executing or scheduled during the call
> >>> to the stop() callback?
> >>>
> >>> If no guarantee is made, is holding the PDL necessary and sufficient to
> >>> guarantee this?
> >>
> >> --
> >> paul
> >> _______________________________________________
> >> erlang-questions mailing list
> >> 
> >> http://www.erlang.org/mailman/listinfo/erlang-questions
> > 
> 
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-- 

/ Raimo Niskanen, Erlang/OTP, Ericsson AB



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