diff options
Diffstat (limited to 'src/include/access/slru.h')
| -rw-r--r-- | src/include/access/slru.h | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/src/include/access/slru.h b/src/include/access/slru.h index 3cc30e76b70..9e18b9608be 100644 --- a/src/include/access/slru.h +++ b/src/include/access/slru.h @@ -6,13 +6,14 @@ * Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/access/slru.h,v 1.20 2007/01/05 22:19:51 momjian Exp $ + * $PostgreSQL: pgsql/src/include/access/slru.h,v 1.21 2007/08/01 22:45:09 tgl Exp $ * *------------------------------------------------------------------------- */ #ifndef SLRU_H #define SLRU_H +#include "access/xlogdefs.h" #include "storage/lwlock.h" @@ -51,6 +52,17 @@ typedef struct SlruSharedData int *page_lru_count; LWLockId *buffer_locks; + /* + * Optional array of WAL flush LSNs associated with entries in the SLRU + * pages. If not zero/NULL, we must flush WAL before writing pages (true + * for pg_clog, false for multixact and pg_subtrans). group_lsn[] has + * lsn_groups_per_page entries per buffer slot, each containing the + * highest LSN known for a contiguous group of SLRU entries on that slot's + * page. + */ + XLogRecPtr *group_lsn; + int lsn_groups_per_page; + /*---------- * We mark a page "most recently used" by setting * page_lru_count[slotno] = ++cur_lru_count; @@ -81,8 +93,8 @@ typedef struct SlruCtlData SlruShared shared; /* - * This flag tells whether to fsync writes (true for pg_clog, false for - * pg_subtrans). + * This flag tells whether to fsync writes (true for pg_clog and multixact + * stuff, false for pg_subtrans). */ bool do_fsync; @@ -106,11 +118,12 @@ typedef SlruCtlData *SlruCtl; typedef struct SlruFlushData *SlruFlush; -extern Size SimpleLruShmemSize(int nslots); -extern void SimpleLruInit(SlruCtl ctl, const char *name, int nslots, +extern Size SimpleLruShmemSize(int nslots, int nlsns); +extern void SimpleLruInit(SlruCtl ctl, const char *name, int nslots, int nlsns, LWLockId ctllock, const char *subdir); extern int SimpleLruZeroPage(SlruCtl ctl, int pageno); -extern int SimpleLruReadPage(SlruCtl ctl, int pageno, TransactionId xid); +extern int SimpleLruReadPage(SlruCtl ctl, int pageno, bool write_ok, + TransactionId xid); extern int SimpleLruReadPage_ReadOnly(SlruCtl ctl, int pageno, TransactionId xid); extern void SimpleLruWritePage(SlruCtl ctl, int slotno, SlruFlush fdata); |