Re: Boost.Threads - once functions

From: tneumann_at_[hidden]
Date: 2001-08-01 02:16:44

> POSIX uses pthread_once to do this, 
> but there's no Win32 equivalent.  Instead, Win32 programmers are 
> expected to make use of DllMain to handle this sort of 
initialization 
in Win32 pthread_once can be simulated by using something similar to 
the the following:

struct OnceInfo {
   DWORD counter;
   bool  done;
};

static OnceInfo info = {-1,false};

void doOnce(OnceInfo& info,void (*foo)())
{
   if (InterlockedIncrement(&info.counter)==0) {
      foo();
      info.done=true;
   } else while (!info.done) Sleep(0);
}

void someFunc() { doOnce(info,foo); }