shared vs __gshared

[Steven Schveighoffer]

On Mon, 10 Jun 2013 09:38:43 -0400, Sergei Nosov <sergei.nosov at gmail.com>  
wrote:

> Hi!
>
> I'm puzzled with what's the difference between shared and __gshared.

shared is part of the type, __gshared is not.

The danger of __gshared is that the compiler treats it as if it were not  
shared.  You better know what you are doing, lots of code expects that  
anything not marked as shared is thread-local.

shared was supposed to infer memory barriers, but AFAIK, it doesn't do  
that.  Not sure it ever will.

-Steve