Horton

Re: Add non-blocking version of PQcancel

Jacob Champion <jchampion@timescale.com>

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From: Jacob Champion <jchampion@timescale.com>
To: Jelte Fennema <Jelte.Fennema@microsoft.com>, Tom Lane <tgl@sss.pgh.pa.us>
Cc: Andres Freund <andres@anarazel.de>, Justin Pryzby <pryzby@telsasoft.com>, Robert Haas <robertmhaas@gmail.com>, "pgsql-hackers@lists.postgresql.org" <pgsql-hackers@lists.postgresql.org>
Date: 2022-11-04T15:58:34Z
Lists: pgsql-hackers 
On 10/5/22 06:23, Jelte Fennema wrote:
> In my first version of this patch, this is exactly what I did. But then
> I got this feedback from Jacob, so I changed it to reusing PGconn:
> 
>>  [snip]
> 
> I changed it back to use PGcancelConn as per your suggestion and I 
> agree that the API got better because of it.

Sorry for the whiplash!

Is the latest attachment the correct version? I don't see any difference
between the latest 0001 and the previous version's 0002 -- it has no
references to PG_TEST_TIMEOUT_DEFAULT, PGcancelConn, etc.

Thanks,
--Jacob

Commits

  1. postgres_fdw: re-issue cancel requests a few times if necessary.

  2. Make postgres_fdw's query_cancel test less flaky.

  3. postgres_fdw: Split out the query_cancel test to its own file

  4. Fix copy-paste mistake in PQcancelCreate

  5. Make libpqsrv_cancel's return const char *, not char *

  6. Stabilize postgres_fdw test

  7. libpq-be-fe-helpers.h: wrap new cancel APIs

  8. dblink/isolationtester/fe_utils: Use new cancel API

  9. Put libpq_pipeline cancel test back

  10. Hopefully make libpq_pipeline's new cancel test more reliable

  11. libpq: Add encrypted and non-blocking query cancellation routines

  12. libpq: Move pg_cancel to fe-cancel.c

  13. Add tests for libpq query cancellation APIs

  14. Add missing connection statuses to docs

  15. libpq: Change some static functions to extern

  16. libpq: Add pqReleaseConnHosts function

  17. libpq: Move cancellation related functions to fe-cancel.c

  18. Make spelling of cancelled/cancellation consistent

  19. Be more wary about OpenSSL not setting errno on error.

  20. libpq: Use modern socket flags, if available.

  21. Drop test view when done with it.

  22. Doc: add some doco about using the libpq_pipeline test module.

  23. postgres_fdw: Allow cancellation of transaction control commands.