[crac] RFR: Linux file system watcher support

[Radim Vansa]

On Sun, 14 May 2023 10:00:26 GMT, joeylee <duke at openjdk.org> wrote:

> inotify monitors changes on filesystem, this support automatic restore for LinuxFileWatcher.
> 
> FileWatcherAfterRestoreTest verifies watcher service works after restore.
> FileWatcherTest verifies automatic closing inotiify fd
> 
> The watcher keys are still managed by user, so exception will be thrown if no watcher keys are leaked, as in FileWatcherWithOpenKeysTest

I was hoping that a fastdebug build with assertions on would fail somewhere earlier but it is not the case. I would suspect that since this NULL dereference is happening when the thread already exits there's an earlier event that goes wrong.

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PR Comment: https://git.openjdk.org/crac/pull/72#issuecomment-1549229817