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Attempts to stop all actively executing tasks, halts the processing of waiting tasks, and returns a list of the tasks that were awaiting execution.
This method does not wait for actively executing tasks to terminate. Use IExecutorService.AwaitTermination(long, Java.Util.Concurrent.TimeUnit) to do that.
There are no guarantees beyond best-effort attempts to stop processing actively executing tasks. For example, typical implementations will cancel via Java.Lang.Thread.Interrupt, so any task that fails to respond to interrupts may never terminate.