def _run_grid_multithread(self, func, iterables):
f = lambda x: threading.Thread(target = func,args = (x,))<EOL>threads = map(f, iterables)<EOL>for thread in threads:<EOL><INDENT>thread.setDaemon(True)<EOL>thread.start()<EOL>thread.join()<EOL><DEDENT>
running case with mutil process to support selenium grid-mode(multiple web) and appium grid-mode(multiple devices). 
        @param func:  function object
        @param iterables:  iterable objects