Function atomic_once

benchmarks/tbb/dynamic_link.cpp:227–229

#if __USE_TBB_ATOMICS
    static void atomic_once ( void (*func) (void), tbb::atomic< tbb::internal::do_once_state > &once_state ) {
        tbb::internal::atomic_do_once( func, once_state );
    }
#define ATOMIC_ONCE_DECL( var ) tbb::atomic< tbb::internal::do_once_state > var
#else
    static void atomic_once ( void (*func) (), pthread_once_t &once_state ) {