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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 {
29 } WalSndState;
30 
31 /*
32  * Each walsender has a WalSnd struct in shared memory.
33  */
34 typedef struct WalSnd
35 {
36  pid_t pid; /* this walsender's process id, or 0 */
37  WalSndState state; /* this walsender's state */
38  XLogRecPtr sentPtr; /* WAL has been sent up to this point */
39  bool needreload; /* does currently-open file need to be
40  * reloaded? */
41 
42  /*
43  * The xlog locations that have been written, flushed, and applied by
44  * standby-side. These may be invalid if the standby-side has not offered
45  * values yet.
46  */
50 
51  /* Measured lag times, or -1 for unknown/none. */
55 
56  /* Protects shared variables shown above. */
58 
59  /*
60  * Pointer to the walsender's latch. Used by backends to wake up this
61  * walsender when it has work to do. NULL if the walsender isn't active.
62  */
64 
65  /*
66  * The priority order of the standby managed by this WALSender, as listed
67  * in synchronous_standby_names, or 0 if not-listed. Protected by
68  * SyncRepLock.
69  */
71 } WalSnd;
72 
73 extern WalSnd *MyWalSnd;
74 
75 /* There is one WalSndCtl struct for the whole database cluster */
76 typedef struct
77 {
78  /*
79  * Synchronous replication queue with one queue per request type.
80  * Protected by SyncRepLock.
81  */
83 
84  /*
85  * Current location of the head of the queue. All waiters should have a
86  * waitLSN that follows this value. Protected by SyncRepLock.
87  */
89 
90  /*
91  * Are any sync standbys defined? Waiting backends can't reload the
92  * config file safely, so checkpointer updates this value as needed.
93  * Protected by SyncRepLock.
94  */
96 
97  WalSnd walsnds[FLEXIBLE_ARRAY_MEMBER];
99 
100 extern WalSndCtlData *WalSndCtl;
101 
102 
103 extern void WalSndSetState(WalSndState state);
104 
105 /*
106  * Internal functions for parsing the replication grammar, in repl_gram.y and
107  * repl_scanner.l
108  */
109 extern int replication_yyparse(void);
110 extern int replication_yylex(void);
111 extern void replication_yyerror(const char *str) pg_attribute_noreturn();
112 extern void replication_scanner_init(const char *query_string);
113 extern void replication_scanner_finish(void);
114 
116 
117 #endif /* _WALSENDER_PRIVATE_H */
int slock_t
Definition: s_lock.h:888
XLogRecPtr write
TimeOffset flushLag
Definition: nodes.h:509
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:3085
WalSndState state
int replication_yyparse(void)
int64 TimeOffset
Definition: timestamp.h:40
XLogRecPtr sentPtr
WalSndCtlData * WalSndCtl
Definition: walsender.c:105
WalSnd * MyWalSnd
Definition: walsender.c:108
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)