Subj : Re: Can C++ local static objects be made thread safe?
To   : comp.programming.threads
From : David Schwartz
Date : Thu Feb 03 2005 02:09 am


"Gianni Mariani" <gi2nospam@mariani.ws> wrote in message 
news:haGdnR1nYeaWBJzfRVn-tg@speakeasy.net...

> Simply because the C++ standard is quite specific in that static function 
> local variables (non POD) must be initialized exactly once on the *first 
> time* that control passes through the variable.  All we're doing here is 
> enforcing this requirement.

    No! The C++ standard says nothing about threads. The C++ standard does 
not provide *any* guarantees in the context of threads. A threading standard 
must specifically restate any C++ standard guarantees that it provides in 
the context of threads. If we're talking POSIX, POSIX specifically requires 
accesses to shared data (which the static object is) to be protected by 
mutexes.

    DS

.