diff options
Diffstat (limited to 'src/include/storage/buf_internals.h')
| -rw-r--r-- | src/include/storage/buf_internals.h | 66 |
1 files changed, 35 insertions, 31 deletions
diff --git a/src/include/storage/buf_internals.h b/src/include/storage/buf_internals.h index f83ad939c45..355859faa3b 100644 --- a/src/include/storage/buf_internals.h +++ b/src/include/storage/buf_internals.h @@ -2,13 +2,13 @@ * * buf_internals.h * Internal definitions for buffer manager and the buffer replacement - * strategy. + * strategy. * * * Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/storage/buf_internals.h,v 1.72 2004/08/29 04:13:10 momjian Exp $ + * $PostgreSQL: pgsql/src/include/storage/buf_internals.h,v 1.73 2004/08/29 05:06:58 momjian Exp $ * *------------------------------------------------------------------------- */ @@ -24,12 +24,15 @@ /* * Flags for buffer descriptors */ -#define BM_DIRTY (1 << 0) /* data needs writing */ -#define BM_VALID (1 << 1) /* data is valid */ -#define BM_IO_IN_PROGRESS (1 << 2) /* read or write in progress */ -#define BM_IO_ERROR (1 << 3) /* previous I/O failed */ -#define BM_JUST_DIRTIED (1 << 4) /* dirtied since write started */ -#define BM_PIN_COUNT_WAITER (1 << 5) /* have waiter for sole pin */ +#define BM_DIRTY (1 << 0) /* data needs writing */ +#define BM_VALID (1 << 1) /* data is valid */ +#define BM_IO_IN_PROGRESS (1 << 2) /* read or write in + * progress */ +#define BM_IO_ERROR (1 << 3) /* previous I/O failed */ +#define BM_JUST_DIRTIED (1 << 4) /* dirtied since write + * started */ +#define BM_PIN_COUNT_WAITER (1 << 5) /* have waiter for sole + * pin */ typedef bits16 BufFlags; @@ -137,13 +140,13 @@ typedef struct */ typedef struct { - int prev; /* list links */ - int next; - short list; /* ID of list it is currently in */ - bool t1_vacuum; /* t => present only because of VACUUM */ - TransactionId t1_xid; /* the xid this entry went onto T1 */ - BufferTag buf_tag; /* page identifier */ - int buf_id; /* currently assigned data buffer, or -1 */ + int prev; /* list links */ + int next; + short list; /* ID of list it is currently in */ + bool t1_vacuum; /* t => present only because of VACUUM */ + TransactionId t1_xid; /* the xid this entry went onto T1 */ + BufferTag buf_tag; /* page identifier */ + int buf_id; /* currently assigned data buffer, or -1 */ } BufferStrategyCDB; /* @@ -151,22 +154,23 @@ typedef struct */ typedef struct { - int target_T1_size; /* What T1 size are we aiming for */ - int listUnusedCDB; /* All unused StrategyCDB */ - int listHead[STRAT_NUM_LISTS]; /* ARC lists B1, T1, T2 and B2 */ - int listTail[STRAT_NUM_LISTS]; - int listSize[STRAT_NUM_LISTS]; - Buffer listFreeBuffers; /* List of unused buffers */ - - long num_lookup; /* Some hit statistics */ - long num_hit[STRAT_NUM_LISTS]; - time_t stat_report; + int target_T1_size; /* What T1 size are we aiming for */ + int listUnusedCDB; /* All unused StrategyCDB */ + int listHead[STRAT_NUM_LISTS]; /* ARC lists B1, T1, T2 + * and B2 */ + int listTail[STRAT_NUM_LISTS]; + int listSize[STRAT_NUM_LISTS]; + Buffer listFreeBuffers; /* List of unused buffers */ + + long num_lookup; /* Some hit statistics */ + long num_hit[STRAT_NUM_LISTS]; + time_t stat_report; /* Array of CDB's starts here */ - BufferStrategyCDB cdb[1]; /* VARIABLE SIZE ARRAY */ + BufferStrategyCDB cdb[1]; /* VARIABLE SIZE ARRAY */ } BufferStrategyControl; - + /* counters in buf_init.c */ extern long int ReadBufferCount; extern long int ReadLocalBufferCount; @@ -184,19 +188,19 @@ extern long int LocalBufferFlushCount; /* freelist.c */ extern BufferDesc *StrategyBufferLookup(BufferTag *tagPtr, bool recheck, - int *cdb_found_index); + int *cdb_found_index); extern BufferDesc *StrategyGetBuffer(int *cdb_replace_index); extern void StrategyReplaceBuffer(BufferDesc *buf, BufferTag *newTag, - int cdb_found_index, int cdb_replace_index); + int cdb_found_index, int cdb_replace_index); extern void StrategyInvalidateBuffer(BufferDesc *buf); extern void StrategyHintVacuum(bool vacuum_active); extern int StrategyDirtyBufferList(BufferDesc **buffers, BufferTag *buftags, - int max_buffers); + int max_buffers); extern void StrategyInitialize(bool init); /* buf_table.c */ extern void InitBufTable(int size); -extern int BufTableLookup(BufferTag *tagPtr); +extern int BufTableLookup(BufferTag *tagPtr); extern void BufTableInsert(BufferTag *tagPtr, int cdb_id); extern void BufTableDelete(BufferTag *tagPtr); |