Parallel processing and further use of output

[Zoidberg via Digitalmars-d-learn]

On Saturday, 26 September 2015 at 13:09:54 UTC, Meta wrote:
> On Saturday, 26 September 2015 at 12:33:45 UTC, anonymous wrote:
>>     foreach (f; parallel(iota(1, 1000000+1)))
>>     {
>>         synchronized i += f;
>>     }
>
> Is this valid syntax? I've never seen synchronized used like 
> this before.

Atomic worked perfectly and reasonably fast. "Synchronized" may 
work as well, but I had to abort the execution prior to finishing 
because it seemed horribly slow.