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Re: Refactoring postmaster's code to cleanup after child exit

Dagfinn Ilmari Mannsåker <ilmari@ilmari.org>

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From: Dagfinn Ilmari Mannsåker <ilmari@ilmari.org>
To: Heikki Linnakangas <hlinnaka@iki.fi>
Cc: Thomas Munro <thomas.munro@gmail.com>, Andres Freund <andres@anarazel.de>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2024-10-05T19:51:50Z
Lists: pgsql-hackers 
Heikki Linnakangas <hlinnaka@iki.fi> writes:

> On 05/10/2024 01:03, Thomas Munro wrote:
>
>> It's possible that Windows copied the Linux behaviour for AF_UNIX,
>> given that it probably has something to do with the WSL project for
>> emulating Linux, but IDK.
>
> Sadly Windows' IO::Socket::UNIX hasn't been implemented on Windows (or
> at least on this perl distribution we're using in Cirrus CI):
>
> Socket::pack_sockaddr_un not implemented on this architecture at
> C:/strawberry/5.26.3.1/perl/lib/Socket.pm line 872.
>
> so I'll have to disable this test on Windows anyway.

Socket version 2.028 (included in Perl 5.32) provides pack_sockaddr_un()
on Windows, so that can be fixed by bumping the Perl version in
https://github.com/anarazel/pg-vm-images/blob/main/packer/windows.pkr.hcl
to something more modern (such as 5.40.0.1), and only skipping the test
if on Windows if Socket is too old.

The decision to use 5.26 seems to come from the initial creation of the
CI images in 2021 (when 5.34 was current), with the comment «newer
versions don't currently work correctly for plperl».  That claim is
worth revisiting, and fixing if it's still the case.


- ilmari

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Fix test name and username used in failed connection attempts

  2. tests: Don't fail due to high default timeout in postmaster/003_start_stop

  3. tests: Fix race condition in postmaster/002_connection_limits

  4. Pass MyPMChildSlot as an explicit argument to child process

  5. Assign a child slot to every postmaster child process

  6. Kill dead-end children when there's nothing else left

  7. Replace postmaster.c's own backend type codes with BackendType

  8. Use an shmem_exit callback to remove backend from PMChildFlags on exit

  9. Add test for dead-end backends

  10. Add test for connection limits

  11. Fix garbled process name on backend crash

  12. Consolidate postmaster code to launch background processes

  13. Fix comment on processes being kept over a restart

  14. Refactor code to handle death of a backend or bgworker in postmaster

  15. Make BackgroundWorkerList doubly-linked

  16. Minor refactoring of assign_backendlist_entry()

  17. Fix outdated comment; all running bgworkers are in BackendList

  18. Allow building with MSVC and Strawberry perl

  19. Fix rare failure in LDAP tests.

  20. Allow notifications to bgworkers without database connections.