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walsender_private.h
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1 /*-------------------------------------------------------------------------
2  *
3  * walsender_private.h
4  * Private definitions from replication/walsender.c.
5  *
6  * Portions Copyright (c) 2010-2017, PostgreSQL Global Development Group
7  *
8  * src/include/replication/walsender_private.h
9  *
10  *-------------------------------------------------------------------------
11  */
12 #ifndef _WALSENDER_PRIVATE_H
13 #define _WALSENDER_PRIVATE_H
14 
15 #include "access/xlog.h"
16 #include "nodes/nodes.h"
17 #include "replication/syncrep.h"
18 #include "storage/latch.h"
19 #include "storage/shmem.h"
20 #include "storage/spin.h"
21 
22 typedef enum WalSndState
23 {
28 } WalSndState;
29 
30 /*
31  * Each walsender has a WalSnd struct in shared memory.
32  */
33 typedef struct WalSnd
34 {
35  pid_t pid; /* this walsender's process id, or 0 */
36  WalSndState state; /* this walsender's state */
37  XLogRecPtr sentPtr; /* WAL has been sent up to this point */
38  bool needreload; /* does currently-open file need to be
39  * reloaded? */
40 
41  /*
42  * The xlog locations that have been written, flushed, and applied by
43  * standby-side. These may be invalid if the standby-side has not offered
44  * values yet.
45  */
49 
50  /* Measured lag times, or -1 for unknown/none. */
54 
55  /* Protects shared variables shown above. */
57 
58  /*
59  * Pointer to the walsender's latch. Used by backends to wake up this
60  * walsender when it has work to do. NULL if the walsender isn't active.
61  */
63 
64  /*
65  * The priority order of the standby managed by this WALSender, as listed
66  * in synchronous_standby_names, or 0 if not-listed. Protected by
67  * SyncRepLock.
68  */
70 } WalSnd;
71 
72 extern WalSnd *MyWalSnd;
73 
74 /* There is one WalSndCtl struct for the whole database cluster */
75 typedef struct
76 {
77  /*
78  * Synchronous replication queue with one queue per request type.
79  * Protected by SyncRepLock.
80  */
82 
83  /*
84  * Current location of the head of the queue. All waiters should have a
85  * waitLSN that follows this value. Protected by SyncRepLock.
86  */
88 
89  /*
90  * Are any sync standbys defined? Waiting backends can't reload the
91  * config file safely, so checkpointer updates this value as needed.
92  * Protected by SyncRepLock.
93  */
95 
96  WalSnd walsnds[FLEXIBLE_ARRAY_MEMBER];
98 
99 extern WalSndCtlData *WalSndCtl;
100 
101 
102 extern void WalSndSetState(WalSndState state);
103 
104 /*
105  * Internal functions for parsing the replication grammar, in repl_gram.y and
106  * repl_scanner.l
107  */
108 extern int replication_yyparse(void);
109 extern int replication_yylex(void);
110 extern void replication_yyerror(const char *str) pg_attribute_noreturn();
111 extern void replication_scanner_init(const char *query_string);
112 extern void replication_scanner_finish(void);
113 
115 
116 #endif /* _WALSENDER_PRIVATE_H */
int slock_t
Definition: s_lock.h:888
XLogRecPtr write
TimeOffset flushLag
Definition: nodes.h:506
TimeOffset writeLag
struct WalSnd WalSnd
slock_t mutex
Node * replication_parse_result
XLogRecPtr flush
Latch * latch
void replication_yyerror(const char *str) pg_attribute_noreturn()
Definition: latch.h:110
void WalSndSetState(WalSndState state)
Definition: walsender.c:2952
WalSndState state
int replication_yyparse(void)
int64 TimeOffset
Definition: timestamp.h:40
XLogRecPtr sentPtr
WalSndCtlData * WalSndCtl
Definition: walsender.c:102
WalSnd * MyWalSnd
Definition: walsender.c:105
TimeOffset applyLag
uint64 XLogRecPtr
Definition: xlogdefs.h:21
int sync_standby_priority
Definition: regguts.h:298
bool needreload
WalSndState
#define pg_attribute_noreturn()
Definition: c.h:653
int replication_yylex(void)
#define NUM_SYNC_REP_WAIT_MODE
Definition: syncrep.h:28
XLogRecPtr apply
void replication_scanner_finish(void)
void replication_scanner_init(const char *query_string)