[dmd-concurrency] draft 5

[Andrei Alexandrescu]

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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