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比如这样P2中断执行顺序是如下这样的，是先执行2.2后执行2.1，
if P2.2
if P2.1
{执行中}
但是实际是2.1先来的，在P2.1中断程序还在执行中时，2.2来了，那么等2.1结束后还能再进入2.2吗，会不会丢失呢？
