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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2007-06-08 18:23:53 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2007-06-08 18:23:53 +0000 |
| commit | a04a423599b347325f9a73dfb2d533b24e1cbab3 (patch) | |
| tree | 5aeb620900a705222eb202c7b4b1d33266d1c190 /src/include/storage | |
| parent | 6d6d14b6d52f7a709fba8fd23244a7de014f2048 (diff) | |
| download | postgresql-a04a423599b347325f9a73dfb2d533b24e1cbab3.tar.gz | |
Arrange for large sequential scans to synchronize with each other, so that
when multiple backends are scanning the same relation concurrently, each page
is (ideally) read only once.
Jeff Davis, with review by Heikki and Tom.
Diffstat (limited to 'src/include/storage')
| -rw-r--r-- | src/include/storage/lwlock.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/include/storage/lwlock.h b/src/include/storage/lwlock.h index 477284b7d1..046064cdc1 100644 --- a/src/include/storage/lwlock.h +++ b/src/include/storage/lwlock.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/storage/lwlock.h,v 1.36 2007/04/16 18:30:04 alvherre Exp $ + * $PostgreSQL: pgsql/src/include/storage/lwlock.h,v 1.37 2007/06/08 18:23:53 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -62,6 +62,7 @@ typedef enum LWLockId AddinShmemInitLock, AutovacuumLock, AutovacuumScheduleLock, + SyncScanLock, /* Individual lock IDs end here */ FirstBufMappingLock, FirstLockMgrLock = FirstBufMappingLock + NUM_BUFFER_PARTITIONS, |