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Work Queue

A work queue service provides a timer API for other FW parts. A timer API client (a component, device, etc.) registers a callback and specifies when the callback should be invoked.

Refer to TBD for full API specification.

A source of time for the work queue is implemented by the specific platform and depends on the underlying architecture and the HW capabilities which determine the resolution of the timer.

.. uml:: images/work-queue-deps.pu
   :caption: Work queue dependencies

Basic Work Queue Flow

.. uml:: images/work-schedule.pu
   :caption: Basic work queue flow

Extensions for SMP Architectures

CPUs with platforms built on the SMP architecture contain only one work queue instance. A client registers its callback in the queue instance that is running on the CPU that the callback is supposed to run.