code: def set_run_on_node_mask(nodemask):
      
      mask = set_to_numa_nodemask(nodemask)
  
      tmp = bitmask_t()
      tmp.maskp = cast(byref(mask), POINTER(c_ulong))
      tmp.size = sizeof(nodemask_t) * 8
  
      if libnuma.numa_run_on_node_mask(byref(tmp)) < 0:
          raise RuntimeError()
docs: Runs the  current thread and its children only on nodes specified in nodemask.
  
      They will not migrate to CPUs of other nodes until the node affinity is
      reset with a new call to L{set_run_on_node_mask}.
  
      @param nodemask: node mask
      @type nodemask: C{set}