Fix ObjectDisposedException in FileSystemWatcher.OSX.cs #34589
Merged
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Synchronize access to disposing the SafeHandle, and clean up some code distributed oddly between the ctor and Start, so as to make more fields readonly and only register for cancellation once everything has started, to avoid race conditions that could otherwise result between cancellation and starting happening concurrently.
Fixes #30056 (comment)
cc: @wfurt
(Separately, I don't see what's a) keeping the callback delegate alive if the FSW is dropped, and b) what's allowing state to be unregistered/cleaned up if the FSW is dropped. Worth following up on unless I'm just missing it.)