Hi,

> I use asynchronous commit (without XLogFlush/fsync at commit). At some moment 
> I would like to XLogFlush (fsync) all already asynchronously committed 
> transactions (inserted but not flushed/fsynced yet WAL records). Assume, that 
> there is no any active transactions at this moment, no any potential race 
> conditions. My problem is to find a proper LSN which I can use as a parameter 
> for XLogFlush.

How is it different from `CHECKPOINT;` ?

> Well, I would like to use such function in C language code, in some solution, 
> not as a function to be used by users.

Assuming the function has value, as you claim, I see no reason not to
expose it similarly to pg_current_wal_*(). On top of that you will
have to test-cover it anyway. The easiest way to do it will be to have
an SQL-wrapper.

-- 
Best regards,
Aleksander Alekseev


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