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

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