diff options
Diffstat (limited to 'src/include/access/slru.h')
| -rw-r--r-- | src/include/access/slru.h | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/src/include/access/slru.h b/src/include/access/slru.h index 972a8227958..def801e34a5 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 1.14 2005/10/15 02:49:42 momjian Exp $ + * $PostgreSQL: pgsql/src/include/access/slru.h,v 1.15 2005/11/05 21:19:47 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -23,13 +23,17 @@ */ #define NUM_SLRU_BUFFERS 8 -/* Page status codes */ +/* + * 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 + * the write started. + */ typedef enum { SLRU_PAGE_EMPTY, /* buffer is not in use */ SLRU_PAGE_READ_IN_PROGRESS, /* page is being read in */ - SLRU_PAGE_CLEAN, /* page is valid and not dirty */ - SLRU_PAGE_DIRTY, /* page is valid but needs write */ + SLRU_PAGE_VALID, /* page is valid and not being written */ SLRU_PAGE_WRITE_IN_PROGRESS /* page is being written out */ } SlruPageStatus; @@ -48,6 +52,7 @@ typedef struct SlruSharedData */ char *page_buffer[NUM_SLRU_BUFFERS]; SlruPageStatus page_status[NUM_SLRU_BUFFERS]; + bool page_dirty[NUM_SLRU_BUFFERS]; int page_number[NUM_SLRU_BUFFERS]; unsigned int page_lru_count[NUM_SLRU_BUFFERS]; LWLockId buffer_locks[NUM_SLRU_BUFFERS]; |