Avoid thread-starvation in BackgroundTaskService #1768
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…queue submitting the work to avoid possible thread starvation
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Goal
Avoid possible thread starvation when submitting tasks to the
BackgroundTaskService.Design
Changed the
BackgroundTaskServiceto internally be able to identify its threads. When the result of aFutureis queried it will first check to see if the task is incomplete&&is queued to be executed on the current thread. If so the task is run immediately and the result is returned.Testing
A new unit test was added that causes thread starvation by adding a task to each queue, which then adds a task to the same queue and then blocks on both tasks to await their completion. This triggers a deadlock as the first task waits for itself to complete.