Peter Johnson 172e438cd6 wpiutil: uv::Async: Keep weak reference to loop ...

Other handles can only be used within the loop itself, but Async is intended
to be used from another thread.  This introduces the possibility of a race
condition between the loop being destroyed and the Async being destroyed.
Change Async to keep a weak reference to a loop and check it before performing
libuv operations.

2018-10-16 09:40:59 -07:00

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