Andres Freund <> writes:
> I am still worried about the following scenario in the EXEC_BACKEND case:

> 1) postmaster starts
> 2) reads config
> 3) executes _PG_init for shared_preload_libraries
> 4) library 'abc' gets config value 'abc.num_workers = 2' and registers as 
> many workers
> 5) some time goes by, workers, backends start
> 6) abc.num_workers gets changed to 3, SIGHUP

This is broken whether it's EXEC_BACKEND or not: you don't get to change
anything that determines the number of workers post-startup.
num_workers should have been declared PGC_POSTMASTER.

                        regards, tom lane

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