[D-runtime] Update request from tango runtime

[Sean Kelly]

IIRC there's an issue where the state variable isn't modified atomically and at a time where fibers can be multiplexed across threads in a certain way. There's a ticket open for it somewhere. I'd not made the change until now because it could wreck performance in the normal case. I'll check out the post. 

Sent from my iPhone

On Apr 15, 2011, at 4:05 AM, Steve Schveighoffer <schveiguy at yahoo.com> wrote:

> On the NG, there is a request to update druntime with changes implemented in Tango (for someone porting Tango to D2).  I'm not super-familiar with fibers, so I don't want to reply to that person, but someone here should.
> 
> -Steve
> 
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