Remove superfluous 'pgprocno' field from PGPROC
It was always just the index of the PGPROC entry from the beginning of the proc array. Introduce a macro to compute it from the pointer instead. Reviewed-by: Andres Freund Discussion: https://www.postgresql.org/message-id/8171f1aa-496f-46a6-afc3-c46fe7a9b407@iki.fi
This commit is contained in:
parent
4989ce7264
commit
28f3915b73
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@ -425,6 +425,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
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{
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volatile PROC_HDR *procglobal = ProcGlobal;
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PGPROC *proc = MyProc;
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int pgprocno = MyProcNumber;
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uint32 nextidx;
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uint32 wakeidx;
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@ -458,7 +459,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
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* less efficiently.
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*/
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if (nextidx != INVALID_PGPROCNO &&
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ProcGlobal->allProcs[nextidx].clogGroupMemberPage != proc->clogGroupMemberPage)
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GetPGProcByNumber(nextidx)->clogGroupMemberPage != proc->clogGroupMemberPage)
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{
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/*
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* Ensure that this proc is not a member of any clog group that
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@ -473,7 +474,7 @@ TransactionGroupUpdateXidStatus(TransactionId xid, XidStatus status,
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if (pg_atomic_compare_exchange_u32(&procglobal->clogGroupFirst,
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&nextidx,
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(uint32) proc->pgprocno))
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(uint32) pgprocno))
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break;
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}
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@ -284,7 +284,7 @@ TwoPhaseShmemInit(void)
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TwoPhaseState->freeGXacts = &gxacts[i];
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/* associate it with a PGPROC assigned by InitProcGlobal */
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gxacts[i].pgprocno = PreparedXactProcs[i].pgprocno;
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gxacts[i].pgprocno = GetNumberFromPGProc(&PreparedXactProcs[i]);
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/*
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* Assign a unique ID for each dummy proc, so that the range of
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@ -461,7 +461,6 @@ MarkAsPreparingGuts(GlobalTransaction gxact, TransactionId xid, const char *gid,
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/* Initialize the PGPROC entry */
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MemSet(proc, 0, sizeof(PGPROC));
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proc->pgprocno = gxact->pgprocno;
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dlist_node_init(&proc->links);
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proc->waitStatus = PROC_WAIT_STATUS_OK;
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if (LocalTransactionIdIsValid(MyProc->lxid))
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@ -780,7 +779,7 @@ pg_prepared_xact(PG_FUNCTION_ARGS)
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while (status->array != NULL && status->currIdx < status->ngxacts)
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{
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GlobalTransaction gxact = &status->array[status->currIdx++];
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PGPROC *proc = &ProcGlobal->allProcs[gxact->pgprocno];
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PGPROC *proc = GetPGProcByNumber(gxact->pgprocno);
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Datum values[5] = {0};
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bool nulls[5] = {0};
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HeapTuple tuple;
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@ -935,7 +934,7 @@ TwoPhaseGetDummyProc(TransactionId xid, bool lock_held)
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{
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GlobalTransaction gxact = TwoPhaseGetGXact(xid, lock_held);
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return &ProcGlobal->allProcs[gxact->pgprocno];
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return GetPGProcByNumber(gxact->pgprocno);
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}
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/************************************************************************/
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@ -1080,7 +1079,7 @@ save_state_data(const void *data, uint32 len)
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void
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StartPrepare(GlobalTransaction gxact)
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{
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PGPROC *proc = &ProcGlobal->allProcs[gxact->pgprocno];
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PGPROC *proc = GetPGProcByNumber(gxact->pgprocno);
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TransactionId xid = gxact->xid;
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TwoPhaseFileHeader hdr;
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TransactionId *children;
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@ -1539,7 +1538,7 @@ FinishPreparedTransaction(const char *gid, bool isCommit)
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* try to commit the same GID at once.
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*/
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gxact = LockGXact(gid, GetUserId());
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proc = &ProcGlobal->allProcs[gxact->pgprocno];
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proc = GetPGProcByNumber(gxact->pgprocno);
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xid = gxact->xid;
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/*
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@ -1379,7 +1379,7 @@ WALInsertLockAcquire(void)
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static int lockToTry = -1;
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if (lockToTry == -1)
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lockToTry = MyProc->pgprocno % NUM_XLOGINSERT_LOCKS;
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lockToTry = MyProcNumber % NUM_XLOGINSERT_LOCKS;
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MyLockNo = lockToTry;
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/*
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@ -326,7 +326,7 @@ BackgroundWriterMain(void)
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if (rc == WL_TIMEOUT && can_hibernate && prev_hibernate)
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{
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/* Ask for notification at next buffer allocation */
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StrategyNotifyBgWriter(MyProc->pgprocno);
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StrategyNotifyBgWriter(MyProcNumber);
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/* Sleep ... */
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(void) WaitLatch(MyLatch,
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WL_LATCH_SET | WL_TIMEOUT | WL_EXIT_ON_PM_DEATH,
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@ -242,7 +242,7 @@ PgArchiverMain(void)
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* Advertise our pgprocno so that backends can use our latch to wake us up
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* while we're sleeping.
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*/
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PgArch->pgprocno = MyProc->pgprocno;
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PgArch->pgprocno = MyProcNumber;
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/* Create workspace for pgarch_readyXlog() */
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arch_files = palloc(sizeof(struct arch_files_state));
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@ -248,7 +248,7 @@ WalSummarizerMain(void)
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/* Advertise ourselves. */
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on_shmem_exit(WalSummarizerShutdown, (Datum) 0);
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LWLockAcquire(WALSummarizerLock, LW_EXCLUSIVE);
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WalSummarizerCtl->summarizer_pgprocno = MyProc->pgprocno;
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WalSummarizerCtl->summarizer_pgprocno = MyProcNumber;
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LWLockRelease(WALSummarizerLock);
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/* Create and switch to a memory context that we can reset on error. */
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@ -4780,7 +4780,7 @@ UnlockBuffers(void)
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* got a cancel/die interrupt before getting the signal.
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*/
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if ((buf_state & BM_PIN_COUNT_WAITER) != 0 &&
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buf->wait_backend_pgprocno == MyProc->pgprocno)
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buf->wait_backend_pgprocno == MyProcNumber)
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buf_state &= ~BM_PIN_COUNT_WAITER;
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UnlockBufHdr(buf, buf_state);
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@ -4930,7 +4930,7 @@ LockBufferForCleanup(Buffer buffer)
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LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
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elog(ERROR, "multiple backends attempting to wait for pincount 1");
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}
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bufHdr->wait_backend_pgprocno = MyProc->pgprocno;
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bufHdr->wait_backend_pgprocno = MyProcNumber;
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PinCountWaitBuf = bufHdr;
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buf_state |= BM_PIN_COUNT_WAITER;
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UnlockBufHdr(bufHdr, buf_state);
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@ -4994,7 +4994,7 @@ LockBufferForCleanup(Buffer buffer)
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*/
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buf_state = LockBufHdr(bufHdr);
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if ((buf_state & BM_PIN_COUNT_WAITER) != 0 &&
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bufHdr->wait_backend_pgprocno == MyProc->pgprocno)
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bufHdr->wait_backend_pgprocno == MyProcNumber)
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buf_state &= ~BM_PIN_COUNT_WAITER;
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UnlockBufHdr(bufHdr, buf_state);
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@ -468,6 +468,7 @@ CreateSharedProcArray(void)
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void
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ProcArrayAdd(PGPROC *proc)
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{
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int pgprocno = GetNumberFromPGProc(proc);
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ProcArrayStruct *arrayP = procArray;
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int index;
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int movecount;
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@ -499,13 +500,13 @@ ProcArrayAdd(PGPROC *proc)
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*/
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for (index = 0; index < arrayP->numProcs; index++)
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{
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int procno PG_USED_FOR_ASSERTS_ONLY = arrayP->pgprocnos[index];
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int this_procno = arrayP->pgprocnos[index];
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Assert(procno >= 0 && procno < (arrayP->maxProcs + NUM_AUXILIARY_PROCS));
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Assert(allProcs[procno].pgxactoff == index);
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Assert(this_procno >= 0 && this_procno < (arrayP->maxProcs + NUM_AUXILIARY_PROCS));
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Assert(allProcs[this_procno].pgxactoff == index);
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/* If we have found our right position in the array, break */
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if (arrayP->pgprocnos[index] > proc->pgprocno)
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if (this_procno > pgprocno)
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break;
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}
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@ -523,7 +524,7 @@ ProcArrayAdd(PGPROC *proc)
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&ProcGlobal->statusFlags[index],
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movecount * sizeof(*ProcGlobal->statusFlags));
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arrayP->pgprocnos[index] = proc->pgprocno;
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arrayP->pgprocnos[index] = GetNumberFromPGProc(proc);
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proc->pgxactoff = index;
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ProcGlobal->xids[index] = proc->xid;
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ProcGlobal->subxidStates[index] = proc->subxidStatus;
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@ -791,6 +792,7 @@ ProcArrayEndTransactionInternal(PGPROC *proc, TransactionId latestXid)
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static void
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ProcArrayGroupClearXid(PGPROC *proc, TransactionId latestXid)
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{
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int pgprocno = GetNumberFromPGProc(proc);
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PROC_HDR *procglobal = ProcGlobal;
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uint32 nextidx;
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uint32 wakeidx;
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@ -808,7 +810,7 @@ ProcArrayGroupClearXid(PGPROC *proc, TransactionId latestXid)
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if (pg_atomic_compare_exchange_u32(&procglobal->procArrayGroupFirst,
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&nextidx,
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(uint32) proc->pgprocno))
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(uint32) pgprocno))
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break;
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}
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@ -57,7 +57,7 @@ ConditionVariableInit(ConditionVariable *cv)
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void
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ConditionVariablePrepareToSleep(ConditionVariable *cv)
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{
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int pgprocno = MyProc->pgprocno;
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int pgprocno = MyProcNumber;
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/*
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* If some other sleep is already prepared, cancel it; this is necessary
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@ -181,10 +181,10 @@ ConditionVariableTimedSleep(ConditionVariable *cv, long timeout,
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* guarantee not to return spuriously, we'll avoid this obvious case.
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*/
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SpinLockAcquire(&cv->mutex);
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if (!proclist_contains(&cv->wakeup, MyProc->pgprocno, cvWaitLink))
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if (!proclist_contains(&cv->wakeup, MyProcNumber, cvWaitLink))
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{
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done = true;
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proclist_push_tail(&cv->wakeup, MyProc->pgprocno, cvWaitLink);
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proclist_push_tail(&cv->wakeup, MyProcNumber, cvWaitLink);
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}
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SpinLockRelease(&cv->mutex);
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@ -236,8 +236,8 @@ ConditionVariableCancelSleep(void)
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return false;
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SpinLockAcquire(&cv->mutex);
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if (proclist_contains(&cv->wakeup, MyProc->pgprocno, cvWaitLink))
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proclist_delete(&cv->wakeup, MyProc->pgprocno, cvWaitLink);
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if (proclist_contains(&cv->wakeup, MyProcNumber, cvWaitLink))
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proclist_delete(&cv->wakeup, MyProcNumber, cvWaitLink);
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else
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signaled = true;
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SpinLockRelease(&cv->mutex);
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@ -281,7 +281,7 @@ ConditionVariableSignal(ConditionVariable *cv)
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void
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ConditionVariableBroadcast(ConditionVariable *cv)
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{
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int pgprocno = MyProc->pgprocno;
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int pgprocno = MyProcNumber;
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PGPROC *proc = NULL;
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bool have_sentinel = false;
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@ -1056,9 +1056,9 @@ LWLockQueueSelf(LWLock *lock, LWLockMode mode)
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/* LW_WAIT_UNTIL_FREE waiters are always at the front of the queue */
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if (mode == LW_WAIT_UNTIL_FREE)
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proclist_push_head(&lock->waiters, MyProc->pgprocno, lwWaitLink);
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proclist_push_head(&lock->waiters, MyProcNumber, lwWaitLink);
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else
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proclist_push_tail(&lock->waiters, MyProc->pgprocno, lwWaitLink);
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proclist_push_tail(&lock->waiters, MyProcNumber, lwWaitLink);
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/* Can release the mutex now */
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LWLockWaitListUnlock(lock);
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@ -1097,7 +1097,7 @@ LWLockDequeueSelf(LWLock *lock)
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*/
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on_waitlist = MyProc->lwWaiting == LW_WS_WAITING;
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if (on_waitlist)
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proclist_delete(&lock->waiters, MyProc->pgprocno, lwWaitLink);
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proclist_delete(&lock->waiters, MyProcNumber, lwWaitLink);
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if (proclist_is_empty(&lock->waiters) &&
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(pg_atomic_read_u32(&lock->state) & LW_FLAG_HAS_WAITERS) != 0)
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@ -1830,7 +1830,7 @@ GetSerializableTransactionSnapshotInt(Snapshot snapshot,
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sxact->finishedBefore = InvalidTransactionId;
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sxact->xmin = snapshot->xmin;
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sxact->pid = MyProcPid;
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sxact->pgprocno = MyProc->pgprocno;
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sxact->pgprocno = MyProcNumber;
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dlist_init(&sxact->predicateLocks);
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dlist_node_init(&sxact->finishedLink);
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sxact->flags = 0;
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@ -65,6 +65,7 @@ bool log_lock_waits = false;
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/* Pointer to this process's PGPROC struct, if any */
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PGPROC *MyProc = NULL;
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int MyProcNumber = INVALID_PGPROCNO;
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/*
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* This spinlock protects the freelist of recycled PGPROC structures.
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@ -228,7 +229,6 @@ InitProcGlobal(void)
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InitSharedLatch(&(proc->procLatch));
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LWLockInitialize(&(proc->fpInfoLock), LWTRANCHE_LOCK_FASTPATH);
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}
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proc->pgprocno = i;
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/*
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* Newly created PGPROCs for normal backends, autovacuum and bgworkers
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@ -353,6 +353,7 @@ InitProcess(void)
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(errcode(ERRCODE_TOO_MANY_CONNECTIONS),
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errmsg("sorry, too many clients already")));
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}
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MyProcNumber = GetNumberFromPGProc(MyProc);
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/*
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* Cross-check that the PGPROC is of the type we expect; if this were not
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@ -566,6 +567,8 @@ InitAuxiliaryProcess(void)
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SpinLockRelease(ProcStructLock);
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MyProcNumber = GetNumberFromPGProc(MyProc);
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/*
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* Initialize all fields of MyProc, except for those previously
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* initialized by InitProcGlobal.
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@ -907,6 +910,7 @@ ProcKill(int code, Datum arg)
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proc = MyProc;
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MyProc = NULL;
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MyProcNumber = INVALID_PGPROCNO;
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DisownLatch(&proc->procLatch);
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procgloballist = proc->procgloballist;
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@ -978,6 +982,7 @@ AuxiliaryProcKill(int code, Datum arg)
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proc = MyProc;
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MyProc = NULL;
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MyProcNumber = INVALID_PGPROCNO;
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DisownLatch(&proc->procLatch);
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SpinLockAcquire(ProcStructLock);
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@ -1903,10 +1908,9 @@ BecomeLockGroupMember(PGPROC *leader, int pid)
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/*
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* Get lock protecting the group fields. Note LockHashPartitionLockByProc
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* accesses leader->pgprocno in a PGPROC that might be free. This is safe
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* because all PGPROCs' pgprocno fields are set during shared memory
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* initialization and never change thereafter; so we will acquire the
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* correct lock even if the leader PGPROC is in process of being recycled.
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* calculates the proc number based on the PGPROC slot without looking at
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* its contents, so we will acquire the correct lock even if the leader
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* PGPROC is in process of being recycled.
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*/
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leader_lwlock = LockHashPartitionLockByProc(leader);
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LWLockAcquire(leader_lwlock, LW_EXCLUSIVE);
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@ -540,7 +540,7 @@ typedef enum
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* used for a given lock group is determined by the group leader's pgprocno.
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*/
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#define LockHashPartitionLockByProc(leader_pgproc) \
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LockHashPartitionLock((leader_pgproc)->pgprocno)
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LockHashPartitionLock(GetNumberFromPGProc(leader_pgproc))
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/*
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* function prototypes
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@ -194,11 +194,6 @@ struct PGPROC
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int pgxactoff; /* offset into various ProcGlobal->arrays with
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* data mirrored from this PGPROC */
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int pgprocno; /* Number of this PGPROC in
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* ProcGlobal->allProcs array. This is set
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* once by InitProcGlobal().
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* ProcGlobal->allProcs[n].pgprocno == n */
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/* These fields are zero while a backend is still starting up: */
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BackendId backendId; /* This backend's backend ID (if assigned) */
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Oid databaseId; /* OID of database this backend is using */
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@ -307,6 +302,7 @@ struct PGPROC
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extern PGDLLIMPORT PGPROC *MyProc;
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extern PGDLLIMPORT int MyProcNumber; /* same as GetNumberFromPGProc(MyProc) */
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/*
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* There is one ProcGlobal struct for the whole database cluster.
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@ -410,8 +406,9 @@ extern PGDLLIMPORT PROC_HDR *ProcGlobal;
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extern PGDLLIMPORT PGPROC *PreparedXactProcs;
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/* Accessor for PGPROC given a pgprocno. */
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/* Accessor for PGPROC given a pgprocno, and vice versa. */
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#define GetPGProcByNumber(n) (&ProcGlobal->allProcs[(n)])
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#define GetNumberFromPGProc(proc) ((proc) - &ProcGlobal->allProcs[0])
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/*
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* We set aside some extra PGPROC structures for auxiliary processes,
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