Switch background worker on/off in runtime.

Hi,
Is it possible to switch on/off a background worker in runtime?

worker.bgw_flags = BGWORKER_SHMEM_ACCESS;
worker.bgw_start_time = BgWorkerStart_PostmasterStart;

I want to switch off the worker based on some flag value, etc, either from the main process or the worker itself.

Are there any already existing examples?

Thanks,
Ishan.

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