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Diffstat (limited to 'src/include/storage/buf_internals.h')
| -rw-r--r-- | src/include/storage/buf_internals.h | 184 |
1 files changed, 0 insertions, 184 deletions
diff --git a/src/include/storage/buf_internals.h b/src/include/storage/buf_internals.h deleted file mode 100644 index bd0907ed952..00000000000 --- a/src/include/storage/buf_internals.h +++ /dev/null @@ -1,184 +0,0 @@ -/*------------------------------------------------------------------------- - * - * buf_internals.h - * Internal definitions for buffer manager. - * - * - * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group - * Portions Copyright (c) 1994, Regents of the University of California - * - * $Id: buf_internals.h,v 1.57 2002/06/20 20:29:52 momjian Exp $ - * - *------------------------------------------------------------------------- - */ -#ifndef BUFMGR_INTERNALS_H -#define BUFMGR_INTERNALS_H - -#include "storage/backendid.h" -#include "storage/buf.h" -#include "storage/lmgr.h" -#include "storage/lwlock.h" - - -/* Buf Mgr constants */ -/* in bufmgr.c */ -extern int Data_Descriptors; -extern int Free_List_Descriptor; -extern int Lookup_List_Descriptor; -extern int Num_Descriptors; - -extern int ShowPinTrace; - -/* - * Flags for buffer descriptors - */ -#define BM_DIRTY (1 << 0) -#define BM_PRIVATE (1 << 1) -#define BM_VALID (1 << 2) -#define BM_DELETED (1 << 3) -#define BM_FREE (1 << 4) -#define BM_IO_IN_PROGRESS (1 << 5) -#define BM_IO_ERROR (1 << 6) -#define BM_JUST_DIRTIED (1 << 7) -#define BM_PIN_COUNT_WAITER (1 << 8) - -typedef bits16 BufFlags; - -/* - * Buffer tag identifies which disk block the buffer contains. - * - * Note: the BufferTag data must be sufficient to determine where to write the - * block, even during a "blind write" with no relcache entry. It's possible - * that the backend flushing the buffer doesn't even believe the relation is - * visible yet (its xact may have started before the xact that created the - * rel). The storage manager must be able to cope anyway. - */ -typedef struct buftag -{ - RelFileNode rnode; - BlockNumber blockNum; /* blknum relative to begin of reln */ -} BufferTag; - -#define CLEAR_BUFFERTAG(a) \ -( \ - (a)->rnode.tblNode = InvalidOid, \ - (a)->rnode.relNode = InvalidOid, \ - (a)->blockNum = InvalidBlockNumber \ -) - -#define INIT_BUFFERTAG(a,xx_reln,xx_blockNum) \ -( \ - (a)->blockNum = (xx_blockNum), \ - (a)->rnode = (xx_reln)->rd_node \ -) - -/* - * BufferDesc -- shared buffer cache metadata for a single - * shared buffer descriptor. - */ -typedef struct sbufdesc -{ - Buffer freeNext; /* links for freelist chain */ - Buffer freePrev; - SHMEM_OFFSET data; /* pointer to data in buf pool */ - - /* tag and id must be together for table lookup (still true?) */ - BufferTag tag; /* file/block identifier */ - int buf_id; /* buffer's index number (from 0) */ - - BufFlags flags; /* see bit definitions above */ - unsigned refcount; /* # of backends holding pins on buffer */ - - LWLockId io_in_progress_lock; /* to wait for I/O to complete */ - LWLockId cntx_lock; /* to lock access to page context */ - - bool cntxDirty; /* new way to mark block as dirty */ - - /* - * We can't physically remove items from a disk page if another - * backend has the buffer pinned. Hence, a backend may need to wait - * for all other pins to go away. This is signaled by setting its own - * backend ID into wait_backend_id and setting flag bit - * BM_PIN_COUNT_WAITER. At present, there can be only one such waiter - * per buffer. - */ - BackendId wait_backend_id; /* backend ID of pin-count waiter */ -} BufferDesc; - -#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. - * - * We have to free these locks in elog(ERROR)... - */ -#define BL_IO_IN_PROGRESS (1 << 0) /* unimplemented */ -#define BL_PIN_COUNT_LOCK (1 << 1) - -/* entry for buffer hashtable */ -typedef struct -{ - BufferTag key; - Buffer id; -} BufferLookupEnt; - -/* - * mao tracing buffer allocation - */ - -/*#define BMTRACE*/ - -#ifdef BMTRACE - -typedef struct _bmtrace -{ - int bmt_pid; - int bmt_buf; - Oid bmt_dbid; - Oid bmt_relid; - BlockNumber bmt_blkno; - int bmt_op; - -#define BMT_NOTUSED 0 -#define BMT_ALLOCFND 1 -#define BMT_ALLOCNOTFND 2 -#define BMT_DEALLOC 3 - -} bmtrace; -#endif /* BMTRACE */ - - -/* - * Bufmgr Interface: - */ - -/* Internal routines: only called by buf.c */ - -/*freelist.c*/ -extern void PinBuffer(BufferDesc *buf); -extern void UnpinBuffer(BufferDesc *buf); -extern BufferDesc *GetFreeBuffer(void); -extern void InitFreeList(bool init); - -/* buf_table.c */ -extern void InitBufTable(void); -extern BufferDesc *BufTableLookup(BufferTag *tagPtr); -extern bool BufTableDelete(BufferDesc *buf); -extern bool BufTableInsert(BufferDesc *buf); - -/* bufmgr.c */ -extern BufferDesc *BufferDescriptors; -extern bits8 *BufferLocks; - -/* localbuf.c */ -extern BufferDesc *LocalBufferDescriptors; - -extern BufferDesc *LocalBufferAlloc(Relation reln, BlockNumber blockNum, - bool *foundPtr); -extern void WriteLocalBuffer(Buffer buffer, bool release); -extern int FlushLocalBuffer(Buffer buffer, bool sync, bool release); -extern void LocalBufferSync(void); -extern void ResetLocalBufferPool(void); - -#endif /* BUFMGR_INTERNALS_H */ |