[dmd-concurrency] draft 5

[Kevin Bealer]

(sorry, ignore that -- accidentally bumped the send.)

On Wed, Jan 20, 2010 at 2:08 AM, Andrei Alexandrescu <andrei at erdani.com>wrote:

> I'm getting message from you that quote some other messages but have no
> other content.
>
> Andrei
>
> Kevin Bealer wrote:
>
>> On Wed, Jan 20, 2010 at 1:50 AM, Andrei Alexandrescu <andrei at erdani.com<mailto:
>> andrei at erdani.com>> wrote:
>>
>>    Sean Kelly wrote:
>>
>>        void fnB() {
>>           // do something that takes a while
>>        }
>>        void fnA() {
>>           spawn( &fnB );
>>        }
>>
>>        void main() {
>>           auto tid = spawn( &fnA );
>>           tid.wait();
>>        }
>>
>>        The main thread doesn't know the thread running fnB exists so it
>>        can't wait for it, even if it's doing completely legitimate work
>>        and shouldn't be interrupted.  How can I trivially rewrite this
>>        program so it completes without error?
>>
>>
>>    If fnB does legitimate work and doesn't call concurrency-related
>>    routines, it will be waited for.
>>
>>    If fnB does call concurrency-related routines, it must end when
>>    main() exits. To me exiting main() is a no-quarters situation: it
>>    means the application is to exit asap. I find it weird to think of
>>    programs that finish main() but continue to do stuff.
>>
>>    To make sure everything is accounted for, the application design
>>    must be such that main() doesn't exit until useful threads are done.
>>
>>
>>    Andrei
>>
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>>
>>
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