Re: [boost] [thread] Questions about TSS

From: Andrey Semashev (andysem_at_[hidden])
Date: 2008-03-06 14:46:17

Peter Dimov wrote:
> Andrey Semashev:
> ....
> 
>> Agreed. And I for one would personally prefer to see a
>> thread_specific_value instead of thread_specific_ptr in this case.
> 
> My favorite spelling is
> 
>     thread_specific< X > tx;
> 
> It can be made to work (I even had implemented it halfway once) but the 
> problematic case is how to handle dynamically loaded (and unloaded) 
> libraries with global/static thread_specific<> variables.

I had done the same thing too (ironically, I used the same spelling as
you suggest), but I only needed to store void* sized POD types, so it
did not make any dynamic allocations and there were no problems with
dlls. In fact, I think such a simple and straightforward tool could be
used as a basic building block for a more advanced tool.

> The shared_ptr-like deleter functionality is in this case simply spelled
> 
>     thread_specific< shared_ptr<X> > tpx;
> 
> Depending on how the thread_local storage class ends up being specified, we 
> might still need to implement thread_specific at some point. 

AFAIR, the C++0x proposal is a new data storage type. Therefore we won't
be able to create TLS class members. This is where thread_specific could
come into play.