blob: 012ce2d92cad1026a891cd80c837f6192a74c738 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
/*-------------------------------------------------------------------------
*
* sinvaladt.h
* POSTGRES shared cache invalidation segment definitions.
*
*
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/sinvaladt.h,v 1.46 2008/03/16 19:47:34 alvherre Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef SINVALADT_H
#define SINVALADT_H
#include "storage/sinval.h"
/*
* The shared cache invalidation manager is responsible for transmitting
* invalidation messages between backends. Any message sent by any backend
* must be delivered to all already-running backends before it can be
* forgotten.
*
* The struct type SharedInvalidationMessage, defining the contents of
* a single message, is defined in sinval.h.
*/
/* Per-backend state in shared invalidation structure */
typedef struct ProcState
{
/* nextMsgNum is -1 in an inactive ProcState array entry. */
int nextMsgNum; /* next message number to read, or -1 */
bool resetState; /* true, if backend has to reset its state */
} ProcState;
/*
* prototypes for functions in sinvaladt.c
*/
extern Size SInvalShmemSize(void);
extern void CreateSharedInvalidationState(void);
extern void SharedInvalBackendInit(void);
extern bool SIInsertDataEntry(SharedInvalidationMessage *data);
extern int SIGetDataEntry(int backendId, SharedInvalidationMessage *data);
extern void SIDelExpiredDataEntries(bool locked);
extern LocalTransactionId GetNextLocalTransactionId(void);
#endif /* SINVALADT_H */
|
