Concurrency architecture for D2

[Walter Bright]

Michel Fortin wrote:
> Also keep in mind that we don't really need a shared vision among 
> everyone. What's needed is someone who takes the decisions. Discussion 
> is only needed to help that person take the right decisions. Although 
> consensus among all members certainly boosts the decider 
> self-confidence, it is not required, and not necessarily desirable 
> either. A consensus among only a few key people is all that is needed, 
> and this has little to do with who is allowed to raise issues and 
> propose solutions.

The real problem with a concurrency model is that very few programmers 
understand the issues. The failed Java concurrency model is an example 
of this shortage. For another, about 5 years ago I attended a panel of 
30 of the top C++ experts in the world to discuss a concurrency model 
for C++0x.

It didn't take long for it to become obvious that exactly two people 
understood the issues - Hans Boehm and Herb Sutter. The rest of us sat 
there slack-jawed and drooling, asking endless inane questions. I wish I 
had the patience Hans and Herb showed in dealing with this.

Since then I have tried to master this topic, but I don't have much 
experience writing complex multithreaded code. So what we need are 
people who are experienced with MT code who can evaluate the design to 
see if we missed the boat or not. I'd rather not shoot at the moon yet 
wind up orbiting some asteroid.