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From: Hurd, Matthew (hurdm_at_[hidden])
Date: 2004-02-16 18:43:32

> On Behalf Of scott
> Subject: RE: [boost] Re: Re: Future of threads (III)

> Do you guys have any thoughts on how to "get work into" the
> class (now that it is truly a running thread)? Cos this is
> the essence of what an AO is. I think :-)
> Cheers,
> Scott

AO's should either have a queue for work or hook into a queue. They are
a bit like a worker pool with one worker ;-)

Another idiom is a future value, where you ask for a value and don't
block until you "read" the value. ACE also has an implementation of
this. You can think of it as a bit like overlapped I/O.

I also advocate a different architectural neutral style where you can
have things at look like function calls that can be:
    1. a function call
    2. a call to queue work pool or active object
    3. an IPC mechanism for same machine transfer, e.g. shared memory
    4. a network mechanism, TCP, UDP, TIB or something, for

If it can be enabled by a policy driven approach then you can change the
architecture of your application by simply changing policies.

I think David Abraham's named parameters could help greatly with this
approach, along with the serialization lib for marshalling support.
This should provide a solid basis for this. I've also thought that
perhaps boost::signals might be the correct approach to take for this
but I'm unsure.

To support this approach you also need mutex aspects that are also
policy driven. I am preparing to submit such locking that builds on the
existing mutexes and locks.


Matt Hurd

Susquehanna Pacific P/L

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