libhv
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support signal event.
This PR mainly adds the signal event function to the event module of libhv. Add two interfaces hsig_add and hsig_del, also add UT test cases corresponding to the event function. now only support Linux.
#459
the ci build-linux failed because of the error:
but i don't modify the hmutex.h file, is it possiable the ci problem?
Thanks for your contribution, I have implemented this function as a reference.