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03ea39b175
Sometimes it's useful to be able to block until something on some other thread "really has finished". This will be needed for moving caching operations onto the executor in Downloader implementations, since we need to guarantee that Downloader.download doesn't return until it's no longer modifying the underlying cache. One solution to this is of course just to not interrupt the thread that's blocking on the condition variable, but there are cases where you do need to do this in case the thread is at some other point in its execution. This is true for Downloader implementations, where the Download.download thread will also be blocking on PriorityTaskManager.proceed. Arranging to conditionally interrupt the thread based on where it's got to is probably possible, but seems complicated and error prone. Issue: #5978 PiperOrigin-RevId: 313152413