diff options
Diffstat (limited to 'src/include/storage/buf_internals.h')
| -rw-r--r-- | src/include/storage/buf_internals.h | 38 |
1 files changed, 28 insertions, 10 deletions
diff --git a/src/include/storage/buf_internals.h b/src/include/storage/buf_internals.h index f2d615151ec..deafa0b8cec 100644 --- a/src/include/storage/buf_internals.h +++ b/src/include/storage/buf_internals.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: buf_internals.h,v 1.61 2003/08/04 02:40:14 momjian Exp $ + * $Id: buf_internals.h,v 1.62 2003/11/13 00:40:02 wieck Exp $ * *------------------------------------------------------------------------- */ @@ -72,17 +72,29 @@ typedef struct buftag (a)->rnode = (xx_reln)->rd_node \ ) +#define BUFFERTAG_EQUALS(a,xx_reln,xx_blockNum) \ +( \ + (a)->rnode.tblNode == (xx_reln)->rd_node.tblNode && \ + (a)->rnode.relNode == (xx_reln)->rd_node.relNode && \ + (a)->blockNum == (xx_blockNum) \ +) +#define BUFFERTAGS_EQUAL(a,b) \ +( \ + (a)->rnode.tblNode == (b)->rnode.tblNode && \ + (a)->rnode.relNode == (b)->rnode.relNode && \ + (a)->blockNum == (b)->blockNum \ +) + /* * BufferDesc -- shared buffer cache metadata for a single * shared buffer descriptor. */ typedef struct sbufdesc { - Buffer freeNext; /* links for freelist chain */ - Buffer freePrev; + Buffer bufNext; /* link in freelist chain */ SHMEM_OFFSET data; /* pointer to data in buf pool */ - /* tag and id must be together for table lookup (still true?) */ + /* tag and id must be together for table lookup */ BufferTag tag; /* file/block identifier */ int buf_id; /* buffer's index number (from 0) */ @@ -107,6 +119,7 @@ typedef struct sbufdesc #define BufferDescriptorGetBuffer(bdesc) ((bdesc)->buf_id + 1) + /* * Each backend has its own BufferLocks[] array holding flag bits * showing what locks it has set on each buffer. @@ -167,14 +180,19 @@ extern long int LocalBufferFlushCount; /*freelist.c*/ extern void PinBuffer(BufferDesc *buf); extern void UnpinBuffer(BufferDesc *buf); -extern BufferDesc *GetFreeBuffer(void); -extern void InitFreeList(bool init); +extern BufferDesc *StrategyBufferLookup(BufferTag *tagPtr, bool recheck); +extern BufferDesc *StrategyGetBuffer(void); +extern void StrategyReplaceBuffer(BufferDesc *buf, Relation rnode, BlockNumber blockNum); +extern void StrategyInvalidateBuffer(BufferDesc *buf); +extern void StrategyHintVacuum(bool vacuum_active); +extern int StrategyDirtyBufferList(int *buffer_dirty, int max_buffers); +extern void StrategyInitialize(bool init); /* buf_table.c */ -extern void InitBufTable(void); -extern BufferDesc *BufTableLookup(BufferTag *tagPtr); -extern bool BufTableDelete(BufferDesc *buf); -extern bool BufTableInsert(BufferDesc *buf); +extern void InitBufTable(int size); +extern int BufTableLookup(BufferTag *tagPtr); +extern bool BufTableInsert(BufferTag *tagPtr, Buffer buf_id); +extern bool BufTableDelete(BufferTag *tagPtr); /* bufmgr.c */ extern BufferDesc *BufferDescriptors; |