RFR: 8293067: (fs) Implement WatchService using system library (macOS)

[Michael Hall]

> 
> @AlanBateman still can't reproduce any of that on my hardware, 
> 

Same using ‘make test’ besides my own modified. 

Passed: java/nio/file/WatchService/LotsOfEvents.java

> I've been backed up with other things and finally getting to look at this more closely. For testing, I tried both release and debug builds across a range of macOS releases on both x64 and aarch64. Unfortunately there is a lot of timeouts and intermittent failures and across quite a range of macOS releases (from 10.15 to 12.2).

Doesn’t this sort of sound like a threading/deadlock type issue? Intermittent - timeouts. Maybe your runloop concerns were well founded.




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