diff options
Diffstat (limited to 'src/include/storage/bufmgr.h')
| -rw-r--r-- | src/include/storage/bufmgr.h | 59 |
1 files changed, 55 insertions, 4 deletions
diff --git a/src/include/storage/bufmgr.h b/src/include/storage/bufmgr.h index fdc3abcee4..f27e9d1ed3 100644 --- a/src/include/storage/bufmgr.h +++ b/src/include/storage/bufmgr.h @@ -6,7 +6,7 @@ * * Copyright (c) 1994, Regents of the University of California * - * $Id: bufmgr.h,v 1.18 1998/02/26 04:43:22 momjian Exp $ + * $Id: bufmgr.h,v 1.19 1998/04/24 14:43:18 momjian Exp $ * *------------------------------------------------------------------------- */ @@ -18,6 +18,7 @@ #include <storage/ipc.h> #include <storage/block.h> #include <storage/buf.h> +#include <storage/buf_internals.h> #include <utils/rel.h> /* @@ -73,6 +74,59 @@ extern int ShowPinTrace; #define BUFFER_LATE_WRITE 1 /* delayed write: mark as DIRTY */ /* + * BufferIsValid -- + * True iff the refcnt of the local buffer is > 0 + * Note: + * BufferIsValid(InvalidBuffer) is False. + * BufferIsValid(UnknownBuffer) is False. + */ +#define BufferIsValid(bufnum) \ +( \ + BufferIsLocal(bufnum) ? \ + ((bufnum) >= -NLocBuffer && LocalRefCount[-(bufnum) - 1] > 0) \ + : \ + ( \ + BAD_BUFFER_ID(bufnum) ? \ + false \ + : \ + (PrivateRefCount[(bufnum) - 1] > 0) \ + ) \ +) + +#define IncrBufferRefCount(buffer) \ +( \ + BufferIsLocal(buffer) ? \ + ( \ + (void)AssertMacro(LocalRefCount[-(buffer) - 1] >= 0), \ + (void)LocalRefCount[-(buffer) - 1]++ \ + ) \ + : \ + ( \ + (void)AssertMacro(!BAD_BUFFER_ID(buffer)), \ + (void)AssertMacro(PrivateRefCount[(buffer) - 1] >= 0), \ + (void)PrivateRefCount[(buffer) - 1]++ \ + ) \ +) + +/* + * BufferGetBlock -- + * Returns a reference to a disk page image associated with a buffer. + * + * Note: + * Assumes buffer is valid. + */ +#define BufferGetBlock(buffer) \ +( \ + (void)AssertMacro(BufferIsValid(buffer)), \ +\ + BufferIsLocal(buffer) ? \ + ((Block) MAKE_PTR(LocalBufferDescriptors[-(buffer) - 1].data)) \ + : \ + ((Block) MAKE_PTR(BufferDescriptors[(buffer) - 1].data)) \ +) + + +/* * prototypes for functions in bufmgr.c */ extern Buffer @@ -91,17 +145,14 @@ extern void ResetBufferUsage(void); extern void ResetBufferPool(void); extern int BufferPoolCheckLeak(void); extern void FlushBufferPool(int StableMainMemoryFlag); -extern bool BufferIsValid(Buffer bufnum); extern BlockNumber BufferGetBlockNumber(Buffer buffer); extern Relation BufferGetRelation(Buffer buffer); extern BlockNumber RelationGetNumberOfBlocks(Relation relation); -extern Block BufferGetBlock(Buffer buffer); extern void ReleaseRelationBuffers(Relation rdesc); extern void DropBuffers(Oid dbid); extern void PrintBufferDescs(void); extern void PrintPinnedBufs(void); extern int BufferShmemSize(void); -extern void IncrBufferRefCount(Buffer buffer); extern int ReleaseBuffer(Buffer buffer); extern void BufferRefCountReset(int *refcountsave); |