mirrors/postgres
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Clean up comments.

Browse Source
This commit is contained in:
Tom Lane 1999-11-21 19:56:12 +00:00
parent d8ba3dfb0b
commit 3047b444e8
1 changed files with 14 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
src/include/storage/buf_internals.h
View File

@ -1,16 +1,12 @@
/*-------------------------------------------------------------------------
*
* buf_internals.h
* Internal definitions.
* Internal definitions for buffer manager.
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: buf_internals.h,v 1.33 1999/09/24 00:25:27 tgl Exp $
*
* NOTE
* If BUFFERPAGE0 is defined, then 0 will be used as a
* valid buffer page number.
* $Id: buf_internals.h,v 1.34 1999/11/21 19:56:12 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -42,18 +38,14 @@ extern int Num_Descriptors;
typedef bits16 BufFlags;
typedef struct sbufdesc BufferDesc;
typedef struct sbufdesc BufferHdr;
typedef struct buftag BufferTag;
/* long * so alignment will be correct */
typedef long **BufferBlock;
struct buftag
typedef struct buftag
{
LockRelId relId;
BlockNumber blockNum; /* blknum relative to begin of reln */
};
} BufferTag;
#define CLEAR_BUFFERTAG(a) \
( \
@ -72,8 +64,8 @@ struct buftag
#define INVALID_DESCRIPTOR (-3)
/*
* struct sbufdesc -- shared buffer cache metadata for a single
* shared buffer descriptor.
* BufferDesc -- shared buffer cache metadata for a single
* shared buffer descriptor.
*
* We keep the name of the database and relation in which this
* buffer appears in order to avoid a catalog lookup on cache
@ -83,9 +75,9 @@ struct buftag
* Dbname, relname, dbid, and relid are enough to determine where
* to put the buffer, for all storage managers.
*/
struct sbufdesc
typedef struct sbufdesc
{
Buffer freeNext; /* link for freelist chain */
Buffer freeNext; /* links for freelist chain */
Buffer freePrev;
SHMEM_OFFSET data; /* pointer to data in buf pool */
@ -93,7 +85,7 @@ struct sbufdesc
BufferTag tag; /* file/block identifier */
int buf_id; /* maps global desc to local desc */
BufFlags flags; /* described below */
BufFlags flags; /* see bit definitions above */
unsigned refcount; /* # of times buffer is pinned */
#ifdef HAS_TEST_AND_SET
@ -107,10 +99,12 @@ struct sbufdesc
char sb_dbname[NAMEDATALEN]; /* name of db in which buf belongs */
char sb_relname[NAMEDATALEN]; /* name of reln */
};
} BufferDesc;
/*
* Buffer lock infos in BufferLocks below.
* 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 */
@ -178,7 +172,7 @@ extern BufferDesc *LocalBufferDescriptors;
extern int NLocBuffer;
extern BufferDesc *LocalBufferAlloc(Relation reln, BlockNumber blockNum,
bool *foundPtr);
bool *foundPtr);
extern int WriteLocalBuffer(Buffer buffer, bool release);
extern int FlushLocalBuffer(Buffer buffer, bool release);
extern void InitLocalBuffer(void);