Function ForEachArena

benchmarks/tbb/task_group_context.cpp:390–402

Propagate to all master threads (under my_arenas_list_mutex lock)

    }
    // Propagate to all master threads (under my_arenas_list_mutex lock)
    ForEachArena(a) { // uses lock on my_arenas_list_mutex
        arena_slot &slot = a.my_slots[0];
        generic_scheduler *s = slot.my_scheduler;
        // If the master is under construction, skip it. Otherwise make sure that it does not
        // leave its arena and its scheduler get destroyed while we accessing its data.
        if ( s && as_atomic(slot.my_scheduler).compare_and_swap(LockedMaster, s) == s ) { //TODO: remove need in lock
            __TBB_ASSERT( slot.my_scheduler == LockedMaster, NULL );
            // The whole propagation sequence is locked, thus no contention is expected
            __TBB_ASSERT( s != LockedMaster, NULL );
            s->propagate_task_group_state( mptr_state, src, new_state );
            __TBB_store_with_release( slot.my_scheduler, s );
        }
    } EndForEach();
    return true;
}