Re: [boost] [thread] A few submissions

Subject: Re: [boost] [thread] A few submissions
From: Andrey Semashev (andrey.semashev_at_[hidden])
Date: 2010-07-04 18:20:59

>>>>>> A few notes up-front. There are extensions in some compilers
>>>>>> for TLS support. It offers even better performance and easier
>>>>>> to use. Also, C++0x will bring this feature into the language.
>>>>>> But: * It is known to have problems with dynamically-loaded
>>>>>> modules. * It is not portable. Even when C++0x it out, not all
>>>>>> compilers will support it right away. * thread_specific does
>>>>>> not require the variable to have a static storage duration.
>>>>>
>>>>> Stefan Stasser has proposed a stati_thread_specific_ptr (see
>>>>> attached file). What about a static_thread_specific that could be
>>>>> implemented using the C++0x thread_local, when available?
>>>>
>>>> Please, see my up-front notes, I've already answered. :)
>>>
>>> Do you mean that at the end the  C++0x standard will have problems
>>> with dynamically-loaded modules? :(
>>
>> I mean that current compilers have this problem. Whether the
>> C++0x-conforming implementations will solve it or not is yet to be seen.
>
> Then if I understand your thread_specific class doesn't have any issues with dynamically-loaded
> modules, isn't it? If this is the case, could you clarify how your class avoids the problem?

It explicitly uses native API (pthread_key_create, TlsAlloc, etc.) to 
manage TLS slots.