Re: [boost] Race condition in boost::spirit?

From: Roland Schwarz (roland.schwarz_at_[hidden])
Date: 2005-01-17 11:46:29

stas garifulin wrote:

> I'm using vc71 with multi-threaded runtime.
> Sometimes then boost::spirit code is accessed from different threads 
> simultaneously i have access violation at 
> boost/spirit/core/non_terminal/impl/grammar.ipp (255):
>
> # ifdef BOOST_SPIRIT_THREADSAFE
>        static boost::thread_specific_ptr<ptr_t> tld_helper; // <-- Here
>        if (!tld_helper.get())
>            tld_helper.reset(new ptr_t);
>        ptr_t &helper = *tld_helper;
> # else
>
I am afraid the usage of thread_specific_ptr as a local static object is 
"implementation dependant".
The constructors might be called when "first time control passes through 
its declaration".
This would be bad. As far as I know thread_specific_ptr is expected to 
be constructed before
main.
Also what does "first time" mean when MT is involved? The standard does 
not know about MT.
Will it be called twice?

I think the poiner should be moved to file scope.

Roland