[orc-rt] Introduce Task and TaskDispatcher APIs and implementations. #168514
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Introduces the Task and TaskDispatcher interfaces (TaskDispatcher.h), ThreadPoolTaskDispatcher implementation (ThreadPoolTaskDispatch.h), and updates Session to include a TaskDispatcher instance that can be used to run tasks. TaskDispatcher's introduction is motivated by the need to handle calls to JIT'd code initiated from the controller process: Incoming calls will be wrapped in Tasks and dispatched. Session shutdown will wait on TaskDispatcher shutdown, ensuring that all Tasks are run or destroyed prior to the Session being destroyed.
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Introduces the Task and TaskDispatcher interfaces (TaskDispatcher.h), ThreadPoolTaskDispatcher implementation (ThreadPoolTaskDispatch.h), and updates Session to include a TaskDispatcher instance that can be used to run tasks.
TaskDispatcher's introduction is motivated by the need to handle calls to JIT'd code initiated from the controller process: Incoming calls will be wrapped in Tasks and dispatched. Session shutdown will wait on TaskDispatcher shutdown, ensuring that all Tasks are run or destroyed prior to the Session being destroyed.