diff options
Diffstat (limited to 'src/include/access/xlog.h')
| -rw-r--r-- | src/include/access/xlog.h | 44 |
1 files changed, 43 insertions, 1 deletions
diff --git a/src/include/access/xlog.h b/src/include/access/xlog.h index 052a314d74e..ae624a08154 100644 --- a/src/include/access/xlog.h +++ b/src/include/access/xlog.h @@ -6,7 +6,7 @@ * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.93 2009/06/26 20:29:04 tgl Exp $ + * $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.94 2009/12/19 01:32:42 sriggs Exp $ */ #ifndef XLOG_H #define XLOG_H @@ -133,7 +133,45 @@ typedef struct XLogRecData } XLogRecData; extern TimeLineID ThisTimeLineID; /* current TLI */ + +/* + * Prior to 8.4, all activity during recovery was carried out by Startup + * process. This local variable continues to be used in many parts of the + * code to indicate actions taken by RecoveryManagers. Other processes who + * potentially perform work during recovery should check RecoveryInProgress() + * see XLogCtl notes in xlog.c + */ extern bool InRecovery; + +/* + * Like InRecovery, standbyState is only valid in the startup process. + * + * In DISABLED state, we're performing crash recovery or hot standby was + * disabled in recovery.conf. + * + * In INITIALIZED state, we haven't yet received a RUNNING_XACTS or shutdown + * checkpoint record to initialize our master transaction tracking system. + * + * When the transaction tracking is initialized, we enter the SNAPSHOT_PENDING + * state. The tracked information might still be incomplete, so we can't allow + * connections yet, but redo functions must update the in-memory state when + * appropriate. + * + * In SNAPSHOT_READY mode, we have full knowledge of transactions that are + * (or were) running in the master at the current WAL location. Snapshots + * can be taken, and read-only queries can be run. + */ +typedef enum +{ + STANDBY_DISABLED, + STANDBY_INITIALIZED, + STANDBY_SNAPSHOT_PENDING, + STANDBY_SNAPSHOT_READY +} HotStandbyState; +extern HotStandbyState standbyState; + +#define InHotStandby (standbyState >= STANDBY_SNAPSHOT_PENDING) + extern XLogRecPtr XactLastRecEnd; /* these variables are GUC parameters related to XLOG */ @@ -143,9 +181,12 @@ extern bool XLogArchiveMode; extern char *XLogArchiveCommand; extern int XLogArchiveTimeout; extern bool log_checkpoints; +extern bool XLogRequestRecoveryConnections; +extern int MaxStandbyDelay; #define XLogArchivingActive() (XLogArchiveMode) #define XLogArchiveCommandSet() (XLogArchiveCommand[0] != '\0') +#define XLogStandbyInfoActive() (XLogRequestRecoveryConnections && XLogArchiveMode) #ifdef WAL_DEBUG extern bool XLOG_DEBUG; @@ -203,6 +244,7 @@ extern void xlog_desc(StringInfo buf, uint8 xl_info, char *rec); extern bool RecoveryInProgress(void); extern bool XLogInsertAllowed(void); +extern TimestampTz GetLatestXLogTime(void); extern void UpdateControlFile(void); extern Size XLOGShmemSize(void); |