[boost] Re: Singleton: review

From: Andrei Alexandrescu (See Website For Email) (SeeWebsiteForEmail_at_[hidden])
Date: 2005-05-16 13:57:49

Gennadiy Rozental wrote:
>>>Author does admit that multithreading issues were not considered. IMO any 
>>>singleton design that doesn't cover MT couldn't be accepted as generic.
>>
>>Not every library in Boost is MT safe even when it could be useful.
>>MT was left into next stage.
> 
> You could not leave MT for the next stage of singleton design. Singletons 
> have a long history dealing with MT issues topped with DL idiom.

I agree with Gennadiy (in case he's right; I haven't looked at the 
implementation). A Singleton without careful design for MT is IMHO 
unacceptable, no matter how carefully designed it is in any other 
dimension. Singleton is a shared object, and it must address MT issues 
first and foremost.

Andrei