diff options
Diffstat (limited to 'src/include/access/slru.h')
| -rw-r--r-- | src/include/access/slru.h | 32 |
1 files changed, 14 insertions, 18 deletions
diff --git a/src/include/access/slru.h b/src/include/access/slru.h index 62acb43c4e9..66d65c7bedc 100644 --- a/src/include/access/slru.h +++ b/src/include/access/slru.h @@ -6,7 +6,7 @@ * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/access/slru.h,v 1.16 2005/12/06 18:10:06 tgl Exp $ + * $PostgreSQL: pgsql/src/include/access/slru.h,v 1.17 2005/12/06 23:08:34 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -17,13 +17,6 @@ /* - * Number of page buffers. Ideally this could be different for CLOG and - * SUBTRANS, but the benefit doesn't seem to be worth any additional - * notational cruft. - */ -#define NUM_SLRU_BUFFERS 8 - -/* * Page status codes. Note that these do not include the "dirty" bit. * page_dirty can be TRUE only in the VALID or WRITE_IN_PROGRESS states; * in the latter case it implies that the page has been re-dirtied since @@ -44,16 +37,19 @@ typedef struct SlruSharedData { LWLockId ControlLock; + /* Number of buffers managed by this SLRU structure */ + int num_slots; + /* - * Info for each buffer slot. Page number is undefined when status is - * EMPTY. + * Arrays holding info for each buffer slot. Page number is undefined + * when status is EMPTY, as is page_lru_count. */ - char *page_buffer[NUM_SLRU_BUFFERS]; - SlruPageStatus page_status[NUM_SLRU_BUFFERS]; - bool page_dirty[NUM_SLRU_BUFFERS]; - int page_number[NUM_SLRU_BUFFERS]; - int page_lru_count[NUM_SLRU_BUFFERS]; - LWLockId buffer_locks[NUM_SLRU_BUFFERS]; + char **page_buffer; + SlruPageStatus *page_status; + bool *page_dirty; + int *page_number; + int *page_lru_count; + LWLockId *buffer_locks; /*---------- * We mark a page "most recently used" by setting @@ -110,8 +106,8 @@ typedef SlruCtlData *SlruCtl; typedef struct SlruFlushData *SlruFlush; -extern Size SimpleLruShmemSize(void); -extern void SimpleLruInit(SlruCtl ctl, const char *name, +extern Size SimpleLruShmemSize(int nslots); +extern void SimpleLruInit(SlruCtl ctl, const char *name, int nslots, LWLockId ctllock, const char *subdir); extern int SimpleLruZeroPage(SlruCtl ctl, int pageno); extern int SimpleLruReadPage(SlruCtl ctl, int pageno, TransactionId xid); |