diff options
Diffstat (limited to 'src/backend/access/transam/subtrans.c')
| -rw-r--r-- | src/backend/access/transam/subtrans.c | 26 |
1 files changed, 14 insertions, 12 deletions
diff --git a/src/backend/access/transam/subtrans.c b/src/backend/access/transam/subtrans.c index 7976de2300c..93a586148be 100644 --- a/src/backend/access/transam/subtrans.c +++ b/src/backend/access/transam/subtrans.c @@ -5,7 +5,7 @@ * * The pg_subtrans manager is a pg_clog-like manager that stores the parent * transaction Id for each transaction. It is a fundamental part of the - * nested transactions implementation. A main transaction has a parent + * nested transactions implementation. A main transaction has a parent * of InvalidTransactionId, and each subtransaction has its immediate parent. * The tree can easily be walked from child to parent, but not in the * opposite direction. @@ -22,7 +22,7 @@ * Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/backend/access/transam/subtrans.c,v 1.4 2004/08/29 04:12:23 momjian Exp $ + * $PostgreSQL: pgsql/src/backend/access/transam/subtrans.c,v 1.5 2004/08/29 05:06:40 momjian Exp $ * *------------------------------------------------------------------------- */ @@ -57,6 +57,7 @@ * Link to shared-memory data structures for SUBTRANS control */ static SlruCtlData SubTransCtlData; + #define SubTransCtl (&SubTransCtlData) @@ -101,7 +102,7 @@ SubTransGetParent(TransactionId xid) int entryno = TransactionIdToEntry(xid); int slotno; TransactionId *ptr; - TransactionId parent; + TransactionId parent; /* Can't ask about stuff that might not be around anymore */ Assert(TransactionIdFollowsOrEquals(xid, RecentXmin)); @@ -139,7 +140,7 @@ TransactionId SubTransGetTopmostTransaction(TransactionId xid) { TransactionId parentXid = xid, - previousXid = xid; + previousXid = xid; /* Can't ask about stuff that might not be around anymore */ Assert(TransactionIdFollowsOrEquals(xid, RecentXmin)); @@ -185,7 +186,7 @@ SUBTRANSShmemInit(void) * must have been called already.) * * Note: it's not really necessary to create the initial segment now, - * since slru.c would create it on first write anyway. But we may as well + * since slru.c would create it on first write anyway. But we may as well * do it to be sure the directory is set up correctly. */ void @@ -229,10 +230,11 @@ StartupSUBTRANS(void) int startPage; /* - * Since we don't expect pg_subtrans to be valid across crashes, - * we initialize the currently-active page to zeroes during startup. + * Since we don't expect pg_subtrans to be valid across crashes, we + * initialize the currently-active page to zeroes during startup. * Whenever we advance into a new page, ExtendSUBTRANS will likewise - * zero the new page without regard to whatever was previously on disk. + * zero the new page without regard to whatever was previously on + * disk. */ LWLockAcquire(SubtransControlLock, LW_EXCLUSIVE); @@ -251,8 +253,8 @@ ShutdownSUBTRANS(void) /* * Flush dirty SUBTRANS pages to disk * - * This is not actually necessary from a correctness point of view. - * We do it merely as a debugging aid. + * This is not actually necessary from a correctness point of view. We do + * it merely as a debugging aid. */ SimpleLruFlush(SubTransCtl, false); } @@ -266,8 +268,8 @@ CheckPointSUBTRANS(void) /* * Flush dirty SUBTRANS pages to disk * - * This is not actually necessary from a correctness point of view. - * We do it merely to improve the odds that writing of dirty pages is done + * This is not actually necessary from a correctness point of view. We do + * it merely to improve the odds that writing of dirty pages is done * by the checkpoint process and not by backends. */ SimpleLruFlush(SubTransCtl, true); |