joyent/libuv — comment on commit c9697a61f611695e06060417a120ecf82f3f6e4d
File: src/win/pipe.c line 1098
By piscisaureus:

I think this event and the wait handle we will create for it should be re-used, because calling RegisterWaitForSingleObject/Unregisterwait upset windows' wait thread management.