void initializeThreading()
{
#if OS(DARWIN) && ENABLE(JSC_MULTIPLE_THREADS)
    pthread_once(&initializeThreadingKeyOnce, initializeThreadingOnce);
#else
    static bool initializedThreading = false;
    if (!initializedThreading) {
        initializeThreadingOnce();
        initializedThreading = true;
    }
#endif
}
void initializeThreading()
{
#if OS(DARWIN)
    pthread_once(&initializeThreadingKeyOnce, initializeThreadingOnce);
#else
    static bool initializedThreading = false;
    if (!initializedThreading) {
        initializeThreadingOnce();
        initializedThreading = true;
    }
#endif
}