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(parent: c9e2e2d) | patch

Allow discovery of whether a dynamic background worker is running.

Allow discovery of whether a dynamic background worker is running.

Using the infrastructure provided by this patch, it's possible either
to wait for the startup of a dynamically-registered background worker,
or to poll the status of such a worker without waiting. In either
case, the current PID of the worker process can also be obtained.
As usual, worker_spi is updated to demonstrate the new functionality.

Patch by me. Review by Andres Freund.

12 files changed:

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