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Andres Freund 87a6690cc6 Change shutdown sequence to terminate checkpointer last ... The main motivation for this change is to have a process that can serialize stats after all other processes have terminated. Serializing stats already happens in checkpointer, even though walsenders can be active longer. The only reason the current shutdown sequence does not actively cause problems is that walsender currently does not generate any stats. However, there is an upcoming patch changing that. Another need for this change originates in the AIO patchset, where IO workers (which, in some edge cases, can emit stats of their own) need to run while the shutdown checkpoint is being written. This commit changes the shutdown sequence so checkpointer is signalled (via SIGINT) to trigger writing the shutdown checkpoint without also causing checkpointer to exit. Once checkpointer wrote the shutdown checkpoint it notifies postmaster via PMSIGNAL_XLOG_IS_SHUTDOWN and waits for the termination signal (SIGUSR2, as before). Checkpointer now is terminated after all children, other than dead-end children and logger, have been terminated, tracked using the new PM_WAIT_CHECKPOINTER PMState. Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi> Reviewed-by: Bertrand Drouvot <bertranddrouvot.pg@gmail.com> Reviewed-by: Nazir Bilal Yavuz <byavuz81@gmail.com> Discussion: https://postgr.es/m/kgng5nrvnlv335evmsuvpnh354rw7qyazl73kdysev2cr2v5zu@m3cfzxicm5kp		11 months ago
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Makefile	Assign a child slot to every postmaster child process	1 year ago
autovacuum.c	Allow changing autovacuum_max_workers without restarting.	12 months ago
auxprocess.c	Update copyright for 2025	12 months ago
bgworker.c	Update copyright for 2025	12 months ago
bgwriter.c	Update copyright for 2025	12 months ago
checkpointer.c	Change shutdown sequence to terminate checkpointer last	11 months ago
fork_process.c	Update copyright for 2025	12 months ago
interrupt.c	Update copyright for 2025	12 months ago
launch_backend.c	Update copyright for 2025	12 months ago
meson.build	Update copyright for 2025	12 months ago
pgarch.c	Update copyright for 2025	12 months ago
pmchild.c	Allow changing autovacuum_max_workers without restarting.	12 months ago
postmaster.c	Change shutdown sequence to terminate checkpointer last	11 months ago
startup.c	Update copyright for 2025	12 months ago
syslogger.c	Update copyright for 2025	12 months ago
walsummarizer.c	Update copyright for 2025	12 months ago
walwriter.c	Update copyright for 2025	12 months ago