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Add some asserts based on LWLockHeldByMe() for replication slot statistics 

Two assertions checking that ReplicationSlotAllocationLock is acquired
are added to pgstat_create_replslot() and pgstat_drop_replslot(),
corresponding to the routines in charge of the creation and the drop of
replication slot statistics.  The code previously relied on this
assumption and documented it in comments, but did not enforce this
policy at runtime.

Reviewed-by: Bertrand Drouvot
Discussion: https://postgr.es/m/Ze_p-hmD_yFeVYXg@paquier.xyz
This commit is contained in:
Michael Paquier 2024-03-13 07:45:11 +09:00
parent 32dd2c1eff
commit 77cf6a78de
1 changed files with 4 additions and 0 deletions
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4
src/backend/utils/activity/pgstat_replslot.c
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@ -113,6 +113,8 @@ pgstat_create_replslot(ReplicationSlot *slot)
PgStat_EntryRef *entry_ref;
PgStatShared_ReplSlot *shstatent;
Assert(LWLockHeldByMeInMode(ReplicationSlotAllocationLock, LW_EXCLUSIVE));
entry_ref = pgstat_get_entry_ref_locked(PGSTAT_KIND_REPLSLOT, InvalidOid,
ReplicationSlotIndex(slot), false);
shstatent = (PgStatShared_ReplSlot *) entry_ref->shared_stats;
@ -153,6 +155,8 @@ pgstat_acquire_replslot(ReplicationSlot *slot)
void
pgstat_drop_replslot(ReplicationSlot *slot)
{
Assert(LWLockHeldByMeInMode(ReplicationSlotAllocationLock, LW_EXCLUSIVE));
pgstat_drop_entry(PGSTAT_KIND_REPLSLOT, InvalidOid,
ReplicationSlotIndex(slot));
}