Re: One-time initialization of statics in a multithreaded world

From:

"Alex Blekhman" <tkfx.REMOVE@yahoo.com>

Newsgroups:

microsoft.public.vc.language

Date:

Fri, 20 Jul 2007 23:08:41 +0300

Message-ID:

<OXP4FnwyHHA.5408@TK2MSFTNGP02.phx.gbl>

"Bertrand Augereau" wrote:

Sorry I should have provided a example :)

ONE_TIME_INITIALIZE(std::auto_ptr<int>, sCache, new
int(FonctionComplexe()));
... is what I want to express as a replacement to:
static std::auto_ptr<int> sCache(new
int(FonctionComplexe()));

So, if `TYPE' parameter is static, then you can simplify the
macro even more:

#define SAFE_INITIALIZE(TYPE, NAME, INITIALIZER) \
                                                        \
    static volatile LONG NAME##lock = 0L; \
                                                        \
    while(InterlockedExchange(&NAME##lock, 1) != 0) \
    { \
        Sleep(1); \
    } \
                                                        \
    TYPE NAME = INITIALIZER; \
                                                        \
    InterlockedExchange(&NAME##lock, 0);

The same effect can be achieved with critical section
instead of `NAME##lock' variable.

Alex