Re: Allowing WAL fsync to be done via O_SYNC

Tom Lane writes:

> I've been mentally working through the code, and see only one reason why
> it might be necessary to go with a compile-time choice: suppose we see
> that none of O_DSYNC, O_SYNC, O_FSYNC, [others] are defined?

We postulate that one of those has to exist.  Alternatively, you make the
option read

wal_sync_method = fsync | open_sync

In the "parse_hook" for the parameter you if #ifdef out 'open_sync' as a
valid option if none of those exist, so a user will get "'open_sync' is
not a valid option value".

-- 
Peter Eisentraut      peter_e@gmx.net       http://yi.org/peter-e/