diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/include/storage/buf_internals.h | 34 |
1 files changed, 14 insertions, 20 deletions
diff --git a/src/include/storage/buf_internals.h b/src/include/storage/buf_internals.h index b38d3ff5c88..b1417c510bb 100644 --- a/src/include/storage/buf_internals.h +++ b/src/include/storage/buf_internals.h @@ -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); |