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Clean up comments.

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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
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30
src/include/storage/buf_internals.h
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@ -1,16 +1,12 @@
/*------------------------------------------------------------------------- /*-------------------------------------------------------------------------
* *
* buf_internals.h * buf_internals.h
* Internal definitions. * Internal definitions for buffer manager.
* *
* *
* Copyright (c) 1994, Regents of the University of California * Copyright (c) 1994, Regents of the University of California
* *
* $Id: buf_internals.h,v 1.33 1999/09/24 00:25:27 tgl Exp $ * $Id: buf_internals.h,v 1.34 1999/11/21 19:56:12 tgl Exp $
*
* NOTE
* If BUFFERPAGE0 is defined, then 0 will be used as a
* valid buffer page number.
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -42,18 +38,14 @@ extern int Num_Descriptors;
typedef bits16 BufFlags; typedef bits16 BufFlags;
typedef struct sbufdesc BufferDesc;
typedef struct sbufdesc BufferHdr;
typedef struct buftag BufferTag;
/* long * so alignment will be correct */ /* long * so alignment will be correct */
typedef long **BufferBlock; typedef long **BufferBlock;
struct buftag typedef struct buftag
{ {
LockRelId relId; LockRelId relId;
BlockNumber blockNum; /* blknum relative to begin of reln */ BlockNumber blockNum; /* blknum relative to begin of reln */
}; } BufferTag;
#define CLEAR_BUFFERTAG(a) \ #define CLEAR_BUFFERTAG(a) \
( \ ( \
@ -72,7 +64,7 @@ struct buftag
#define INVALID_DESCRIPTOR (-3) #define INVALID_DESCRIPTOR (-3)
/* /*
* struct sbufdesc -- shared buffer cache metadata for a single * BufferDesc -- shared buffer cache metadata for a single
* shared buffer descriptor. * shared buffer descriptor.
* *
* We keep the name of the database and relation in which this * We keep the name of the database and relation in which this
@ -83,9 +75,9 @@ struct buftag
* Dbname, relname, dbid, and relid are enough to determine where * Dbname, relname, dbid, and relid are enough to determine where
* to put the buffer, for all storage managers. * 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; Buffer freePrev;
SHMEM_OFFSET data; /* pointer to data in buf pool */ SHMEM_OFFSET data; /* pointer to data in buf pool */
@ -93,7 +85,7 @@ struct sbufdesc
BufferTag tag; /* file/block identifier */ BufferTag tag; /* file/block identifier */
int buf_id; /* maps global desc to local desc */ 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 */ unsigned refcount; /* # of times buffer is pinned */
#ifdef HAS_TEST_AND_SET #ifdef HAS_TEST_AND_SET
@ -107,10 +99,12 @@ struct sbufdesc
char sb_dbname[NAMEDATALEN]; /* name of db in which buf belongs */ char sb_dbname[NAMEDATALEN]; /* name of db in which buf belongs */
char sb_relname[NAMEDATALEN]; /* name of reln */ 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)... * We have to free these locks in elog(ERROR)...
*/ */
#define BL_IO_IN_PROGRESS (1 << 0) /* unimplemented */ #define BL_IO_IN_PROGRESS (1 << 0) /* unimplemented */