Re: [boost] Review Request: Singularity

Subject: Re: [boost] Review Request: Singularity
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2011-08-23 17:34:42

On 08/23/2011 10:26 PM, Stephan T. Lavavej wrote:
> [Mathias Gaunard]
>> which is simple, short, fast to compile, and thread-safe.
>
> [John Maddock]
>> Not thread safe on the majority of compilers surely?
>
> [Mathias Gaunard]
>> Isn't MSVC the only one that doesn't do it?
>> And MSVC11 does it, I believe.
>> I thought I had read that somewhere, but I can't find the source anymore
>> so maybe I'm just confusing it with something else.
>> Hopefully it will be the case though.
>
> You're thinking of C++11 "magic statics" (my term), http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2660.htm "Dynamic Initialization and Destruction with Concurrency".

I'm just thinking of them being thread-safe.
Whether it uses the crazy lockfree algorithm or not is of little 
relevance to me, and is more a QoI issue.

They have been thread-safe in GCC at least since version 4.0.
It is mandated by the Itanium C++ ABI that is followed by most compilers.