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Make FP_LOCK_SLOTS_PER_BACKEND look like a function

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The FP_LOCK_SLOTS_PER_BACKEND macro looks like a constant, but it
depends on the max_locks_per_transaction GUC, and thus can change. This
is non-obvious and confusing, so make it look more like a function by
renaming it to FastPathLockSlotsPerBackend().

While at it, use the macro when initializing fast-path shared memory,
instead of using the formula.

Reported-by: Andres Freund
Discussion: https://postgr.es/m/ffiwtzc6vedo6wb4gbwelon5nefqg675t5c7an2ta7pcz646cg%40qwmkdb3l4ett
This commit is contained in:
Tomas Vondra
2025-03-04 18:33:09 +01:00
parent 91ecb5e0bc
commit c878de1db4
4 changed files with 10 additions and 9 deletions
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3
src/include/storage/proc.h
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@@ -88,7 +88,8 @@ extern PGDLLIMPORT int FastPathLockGroupsPerBackend;
#define FP_LOCK_GROUPS_PER_BACKEND_MAX 1024
#define FP_LOCK_SLOTS_PER_GROUP 16 /* don't change */
#define FP_LOCK_SLOTS_PER_BACKEND (FP_LOCK_SLOTS_PER_GROUP * FastPathLockGroupsPerBackend)
#define FastPathLockSlotsPerBackend() \
(FP_LOCK_SLOTS_PER_GROUP * FastPathLockGroupsPerBackend)
/*
* Flags for PGPROC.delayChkptFlags