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postgresql/src/include/replication/syncrep.h

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Add new files for syncrep missed in previous commit
2011-03-07 00:39:14 +01:00
/*-------------------------------------------------------------------------
*
* syncrep.h
* Exports from replication/syncrep.c.
*
Update copyright notices for year 2012.
2012-01-02 00:01:58 +01:00
* Portions Copyright (c) 2010-2012, PostgreSQL Global Development Group
Add new files for syncrep missed in previous commit
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*
Cleanup copyright years and file names in the header comments of some files.
2011-03-10 07:05:33 +01:00
* IDENTIFICATION
* src/include/replication/syncrep.h
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*
*-------------------------------------------------------------------------
*/
#ifndef _SYNCREP_H
#define _SYNCREP_H
#include "utils/guc.h"
/* syncRepState */
#define SYNC_REP_NOT_WAITING 0
#define SYNC_REP_WAITING 1
#define SYNC_REP_WAIT_COMPLETE 2
/* user-settable parameters for synchronous replication */
extern char *SyncRepStandbyNames;
/* called by user backend */
extern void SyncRepWaitForLSN(XLogRecPtr XactCommitLSN);
Change the autovacuum launcher to use WaitLatch instead of a poll loop. In pursuit of this (and with the expectation that WaitLatch will be needed in more places), convert the latch field that was already added to PGPROC for sync rep into a generic latch that is activated for all PGPROC-owning processes, and change many of the standard backend signal handlers to set that latch when a signal happens. This will allow WaitLatch callers to be wakened properly by these signals. In passing, fix a whole bunch of signal handlers that had been hacked to do things that might change errno, without adding the necessary save/restore logic for errno. Also make some minor fixes in unix_latch.c, and clean up bizarre and unsafe scheme for disowning the process's latch. Much of this has to be back-patched into 9.1. Peter Geoghegan, with additional work by Tom
2011-08-10 18:20:30 +02:00
/* called at backend exit */
extern void SyncRepCleanupAtProcExit(void);
Add new files for syncrep missed in previous commit
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/* called by wal sender */
extern void SyncRepInitConfig(void);
extern void SyncRepReleaseWaiters(void);
Fix various possible problems with synchronous replication. 1. Don't ignore query cancel interrupts. Instead, if the user asks to cancel the query after we've already committed it, but before it's on the standby, just emit a warning and let the COMMIT finish. 2. Don't ignore die interrupts (pg_terminate_backend or fast shutdown). Instead, emit a warning message and close the connection without acknowledging the commit. Other backends will still see the effect of the commit, but there's no getting around that; it's too late to abort at this point, and ignoring die interrupts altogether doesn't seem like a good idea. 3. If synchronous_standby_names becomes empty, wake up all backends waiting for synchronous replication to complete. Without this, someone attempting to shut synchronous replication off could easily wedge the entire system instead. 4. Avoid depending on the assumption that if a walsender updates MyProc->syncRepState, we'll see the change even if we read it without holding the lock. The window for this appears to be quite narrow (and probably doesn't exist at all on machines with strong memory ordering) but protecting against it is practically free, so do that. 5. Remove useless state SYNC_REP_MUST_DISCONNECT, which isn't needed and doesn't actually do anything. There's still some further work needed here to make the behavior of fast shutdown plausible, but that looks complex, so I'm leaving it for a separate commit. Review by Fujii Masao.
2011-03-17 18:10:42 +01:00
/* called by wal writer */
extern void SyncRepUpdateSyncStandbysDefined(void);
Add new files for syncrep missed in previous commit
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/* called by various procs */
pgindent run before PG 9.1 beta 1.
2011-04-10 17:42:00 +02:00
extern int SyncRepWakeQueue(bool all);
Clean up the #include mess a little. walsender.h should depend on xlog.h, not vice versa. (Actually, the inclusion was circular until a couple hours ago, which was even sillier; but Bruce broke it in the expedient rather than logically correct direction.) Because of that poor decision, plus blind application of pgrminclude, we had a situation where half the system was depending on xlog.h to include such unrelated stuff as array.h and guc.h. Clean up the header inclusion, and manually revert a lot of what pgrminclude had done so things build again. This episode reinforces my feeling that pgrminclude should not be run without adult supervision. Inclusion changes in header files in particular need to be reviewed with great care. More generally, it'd be good if we had a clearer notion of module layering to dictate which headers can sanely include which others ... but that's a big task for another day.
2011-09-04 07:13:16 +02:00
Revise the API for GUC variable assign hooks. The previous functions of assign hooks are now split between check hooks and assign hooks, where the former can fail but the latter shouldn't. Aside from being conceptually clearer, this approach exposes the "canonicalized" form of the variable value to guc.c without having to do an actual assignment. And that lets us fix the problem recently noted by Bernd Helmle that the auto-tune patch for wal_buffers resulted in bogus log messages about "parameter "wal_buffers" cannot be changed without restarting the server". There may be some speed advantage too, because this design lets hook functions avoid re-parsing variable values when restoring a previous state after a rollback (they can store a pre-parsed representation of the value instead). This patch also resolves a longstanding annoyance about custom error messages from variable assign hooks: they should modify, not appear separately from, guc.c's own message about "invalid parameter value".
2011-04-07 06:11:01 +02:00
extern bool check_synchronous_standby_names(char **newval, void **extra, GucSource source);
Add new files for syncrep missed in previous commit
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#endif /* _SYNCREP_H */
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