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按照手册用了，但是主核没有执行回调函数。
@yuty 贴一个例子上来?
麻烦贴一个例子上来。请不要贴手册上那个，那个不能用。
经过我一系列的尝试, 写不出能用的例子来. 感觉信号系统有毒. 另外, expt_signal可以用, 但是主核收到了处理完就要退出T_T. 用H2LDM或者IO_addr配合忙等吧.
