Re: [Boost-users] [statechart] Running one scheduler in many threads

From: Andreas Huber (ahd6974-spamboostorgtrap_at_[hidden])
Date: 2008-04-10 15:18:47

Hi Manuel

> The fifo_scheduler is limited to one execution at a time. I would like a
> schedule object, which can handle many processors in many threads at the
> same time. Lika a threadpool, where the threads takeover a fsm, when it 
> has
> events posted and processes them then. But it should of course only one
> thread at a time process events from one machine.

Because of exactly this constraint, I believe such a thread pool servicing a 
single state_machine would actually slow down event processing (because of 
the locking/signalling overhead; dispatching one event takes a few 
microseconds, tops). The only possible advantage I see is with load 
balancing. E.g. when you have to limit yourself to e.g. 8 threads servicing 
thousands of FSMs, of which only very few are busy processing events at the 
same time.

> Maybe someone has done this and can show me his code? Or tell me if this 
> is
> even possible?

Everything is possible, but I doubt that such a scheduler is of interest to 
many people. Also, it is not exactly the main focus of this library. 
fifo_scheduler & friends were always intended as a minimal but working 
"example". I hope that a future boost lib will offer types that would render 
fifo_scheduler obsolete and maybe offer something like you want.

HTH & Regards,

-- 
Andreas Huber
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