Changes

Openmp unfortunately does not support asynchronous multi-threading as is designed for designed for parallelism, not concurrency.

Can one safely use C++11 multi-threading as well as OpenMP in one and the same program but without

interleaving them (i.e. no OpenMP statement in any code passed to C++11 concurrent features and no

C++11 concurrency in threads spawned by OpenMP)?

On some platforms efficient implementation could only be achieved if the OpenMP run-time is the

also proponents of other execution models (e.g. Intel with Cilk and TBB, GCC with C++11, etc.)

and x86 is usually considered an "experimental" platform (other vendors are usually much more conservative).