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
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
/*-------------------------------------------------------------------------
*
* walsender_private.h
* Private definitions from replication/walsender.c.
*
* Portions Copyright (c) 2010-2025, PostgreSQL Global Development Group
*
* src/include/replication/walsender_private.h
*
*-------------------------------------------------------------------------
*/
#ifndef _WALSENDER_PRIVATE_H
#define _WALSENDER_PRIVATE_H
#include "access/xlog.h"
#include "lib/ilist.h"
#include "nodes/nodes.h"
#include "nodes/replnodes.h"
#include "replication/syncrep.h"
#include "storage/condition_variable.h"
#include "storage/shmem.h"
#include "storage/spin.h"
typedef enum WalSndState
{
WALSNDSTATE_STARTUP = 0,
WALSNDSTATE_BACKUP,
WALSNDSTATE_CATCHUP,
WALSNDSTATE_STREAMING,
WALSNDSTATE_STOPPING,
} WalSndState;
/*
* Each walsender has a WalSnd struct in shared memory.
*
* This struct is protected by its 'mutex' spinlock field, except that some
* members are only written by the walsender process itself, and thus that
* process is free to read those members without holding spinlock. pid and
* needreload always require the spinlock to be held for all accesses.
*/
typedef struct WalSnd
{
pid_t pid; /* this walsender's PID, or 0 if not active */
WalSndState state; /* this walsender's state */
XLogRecPtr sentPtr; /* WAL has been sent up to this point */
bool needreload; /* does currently-open file need to be
* reloaded? */
/*
* The xlog locations that have been written, flushed, and applied by
* standby-side. These may be invalid if the standby-side has not offered
* values yet.
*/
XLogRecPtr write;
XLogRecPtr flush;
XLogRecPtr apply;
/* Measured lag times, or -1 for unknown/none. */
TimeOffset writeLag;
TimeOffset flushLag;
TimeOffset applyLag;
/*
* The priority order of the standby managed by this WALSender, as listed
* in synchronous_standby_names, or 0 if not-listed.
*/
int sync_standby_priority;
/* Protects shared variables in this structure. */
slock_t mutex;
/*
* Timestamp of the last message received from standby.
*/
TimestampTz replyTime;
ReplicationKind kind;
} WalSnd;
extern PGDLLIMPORT WalSnd *MyWalSnd;
/* There is one WalSndCtl struct for the whole database cluster */
typedef struct
{
/*
* Synchronous replication queue with one queue per request type.
* Protected by SyncRepLock.
*/
dlist_head SyncRepQueue[NUM_SYNC_REP_WAIT_MODE];
/*
* Current location of the head of the queue. All waiters should have a
* waitLSN that follows this value. Protected by SyncRepLock.
*/
XLogRecPtr lsn[NUM_SYNC_REP_WAIT_MODE];
/*
* Are any sync standbys defined? Waiting backends can't reload the
* config file safely, so checkpointer updates this value as needed.
* Protected by SyncRepLock.
*/
bool sync_standbys_defined;
/* used as a registry of physical / logical walsenders to wake */
ConditionVariable wal_flush_cv;
ConditionVariable wal_replay_cv;
/*
* Used by physical walsenders holding slots specified in
* synchronized_standby_slots to wake up logical walsenders holding
* logical failover slots when a walreceiver confirms the receipt of LSN.
*/
ConditionVariable wal_confirm_rcv_cv;
WalSnd walsnds[FLEXIBLE_ARRAY_MEMBER];
} WalSndCtlData;
extern PGDLLIMPORT WalSndCtlData *WalSndCtl;
extern void WalSndSetState(WalSndState state);
/*
* Internal functions for parsing the replication grammar, in repl_gram.y and
* repl_scanner.l
*/
union YYSTYPE;
#ifndef YY_TYPEDEF_YY_SCANNER_T
#define YY_TYPEDEF_YY_SCANNER_T
typedef void *yyscan_t;
#endif
extern int replication_yyparse(yyscan_t yyscanner);
extern int replication_yylex(union YYSTYPE *yylval_param, yyscan_t yyscanner);
extern void replication_yyerror(yyscan_t yyscanner, const char *message) pg_attribute_noreturn();
extern void replication_scanner_init(const char *str, yyscan_t *yyscannerp);
extern void replication_scanner_finish(yyscan_t yyscanner);
extern bool replication_scanner_is_replication_command(yyscan_t yyscanner);
extern PGDLLIMPORT Node *replication_parse_result;
#endif /* _WALSENDER_PRIVATE_H */
|
