when i do Dual-core comunicate test ,i find when A core receive ,it is have a "sleep(1)",once i deleted it ,do 20 times test,severl times that they comunicate time is different others! so ,i do not know why use the "sleep(1)" ? If have some way to when B core send message to A core taht Acore can know right now ? so i wan to use interrupt function when Bcore send message to A core ? if you have some suggest and some example to do it?