has_mp_perf_env Function

   PURE FUNCTION has_mp_perf_env() RESULT(res)
      LOGICAL :: res

      res = .FALSE.
      IF (stack_pointer < 1) RETURN
      IF (.NOT. ASSOCIATED(mp_perf_stack(stack_pointer)%mp_perf_env)) RETURN
      res = .TRUE.
   END FUNCTION has_mp_perf_env