Rework the background task service shutdown procedure to give more headroom against the 5s ANR timeout #1624
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Goal
In a worst case scenario,
BackgroundTaskService.shutdown()
could wait for 4.5 seconds to complete a shutdown, which is dangerously close to the 5s limit for an ANR if this happens on the main thread.Rework so that all the shutdowns happen at the same time.
Testing
Rerun all tests. Unfortunately this manifest as a flake in CI so there's no definitive test for it.