diff options
Diffstat (limited to 'src/backend/storage/ipc/sinvaladt.c')
| -rw-r--r-- | src/backend/storage/ipc/sinvaladt.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/src/backend/storage/ipc/sinvaladt.c b/src/backend/storage/ipc/sinvaladt.c index 59310b708fb..21f0ff97579 100644 --- a/src/backend/storage/ipc/sinvaladt.c +++ b/src/backend/storage/ipc/sinvaladt.c @@ -757,6 +757,47 @@ SICleanupQueue(bool callerHasWriteLock, int minFree) } } +/* + * SIResetAll + * Mark all active backends as "reset" + * + * Use this when we don't know what needs to be invalidated. It's a + * cluster-wide InvalidateSystemCaches(). This was a back-branch-only remedy + * to avoid a WAL format change. + * + * The implementation is like SICleanupQueue(false, MAXNUMMESSAGES + 1), with + * one addition. SICleanupQueue() assumes minFree << MAXNUMMESSAGES, so it + * assumes hasMessages==true for any backend it resets. We're resetting even + * fully-caught-up backends, so we set hasMessages. + */ +void +SIResetAll(void) +{ + SISeg *segP = shmInvalBuffer; + int i; + + LWLockAcquire(SInvalWriteLock, LW_EXCLUSIVE); + LWLockAcquire(SInvalReadLock, LW_EXCLUSIVE); + + for (i = 0; i < segP->lastBackend; i++) + { + ProcState *stateP = &segP->procState[i]; + + if (stateP->procPid == 0 || stateP->sendOnly) + continue; + + /* Consuming the reset will update "nextMsgNum" and "signaled". */ + stateP->resetState = true; + stateP->hasMessages = true; + } + + segP->minMsgNum = segP->maxMsgNum; + segP->nextThreshold = CLEANUP_MIN; + + LWLockRelease(SInvalReadLock); + LWLockRelease(SInvalWriteLock); +} + /* * GetNextLocalTransactionId --- allocate a new LocalTransactionId |