[dmd-concurrency] Shutdown protocol

[Andrei Alexandrescu]

Sean Kelly wrote:
> On Jan 21, 2010, at 11:28 AM, Andrei Alexandrescu wrote:
> 
>> Steve Schveighoffer wrote:
>>> ----- Original Message ----
>>>> From: Andrei Alexandrescu <andrei at erdani.com>
>>>> Steve Schveighoffer wrote:
>>>>>  foreach(tid; tids) {tid.join();}
>>>> Oh btw that shouldn't be coded like that, it's slow. Must be something like:
>>>>
>>>> joinAll(tids);
>>>>
>>>> so joining is initiated in parallel.
>>>>
>>> What does joinAll do?  I admit I am not too familiar with your proposed API.
>> The idea is to join on all threads in parallel. Otherwise, if you have N threads, the Nth will become aware you plan to shutdown only after all others have already finished.
> 
> But joining just waits for the thread, it doesn't tell it anything.  Or am I misunderstanding what join() does in this API?

join() on one thread waits for the thread. join() on 100 threads waits 
for 100 threads, not for one thread 100 times.

Andrei