Auto checkpoint creation.

src/backend/access/transam/xlog.c

@@ -6,7 +6,7 @@
  * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Header: /cvsroot/pgsql/src/backend/access/transam/xlog.c,v 1.24 2000/11/05 22:50:19 vadim Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/transam/xlog.c,v 1.25 2000/11/09 11:25:58 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -42,13 +42,13 @@ void		CreateCheckPoint(bool shutdown);
 
 char		XLogDir[MAXPGPATH];
 char		ControlFilePath[MAXPGPATH];
-uint32		XLOGbuffers = 0;
+int			XLOGbuffers = 0;
 XLogRecPtr	MyLastRecPtr = {0, 0};
 bool		StopIfError = false;
 bool		InRecovery = false;
 StartUpID	ThisStartUpID = 0;
 
-int			XLOG_DEBUG = 1;
+int			XLOG_DEBUG = 0;
 
 /* To read/update control file and create new log file */
 SPINLOCK	ControlFileLockId;
@@ -919,7 +919,7 @@ MoveOfflineLogs(char *archdir, uint32 _logId, uint32 _logSeg)
 		elog(LOG, "MoveOfflineLogs: %s %s", (archdir[0]) ? 
 			"archive" : "remove", xlde->d_name);
 		sprintf(path, "%s%c%s",	XLogDir, SEP_CHAR, xlde->d_name);
-		if (archdir[0] != 0)
+		if (archdir[0] == 0)
 			unlink(path);
 		errno = 0;
 	}
@@ -1641,9 +1641,14 @@ SetThisStartUpID(void)
 void
 ShutdownXLOG()
 {
-
+#ifdef XLOG
+	extern void CreateDummyCaches(void);
+#endif
 	elog(LOG, "Data Base System shutting down at %s", str_time(time(NULL)));
 
+#ifdef XLOG
+	CreateDummyCaches();
+#endif
 	CreateCheckPoint(true);
 
 	elog(LOG, "Data Base System shut down at %s", str_time(time(NULL)));

src/backend/bootstrap/bootstrap.c

@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/bootstrap/bootstrap.c,v 1.97 2000/11/08 22:09:56 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/bootstrap/bootstrap.c,v 1.98 2000/11/09 11:25:58 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -220,7 +220,7 @@ BootstrapMain(int argc, char *argv[])
 	int			i;
 	char	   *dbName;
 	int			flag;
-	bool		xloginit = false;
+	int			xlogop = BS_XLOG_NOP;
 	char       *potential_DataDir = NULL;
 
 	extern int	optind;
@@ -260,7 +260,7 @@ BootstrapMain(int argc, char *argv[])
 		potential_DataDir = getenv("PGDATA"); /* Null if no PGDATA variable */
 	}
 
-	while ((flag = getopt(argc, argv, "D:dCQxpB:F")) != EOF)
+	while ((flag = getopt(argc, argv, "D:dCQx:pB:F")) != EOF)
 	{
 		switch (flag)
 		{
@@ -281,7 +281,7 @@ BootstrapMain(int argc, char *argv[])
 				Quiet = true;
 				break;
 			case 'x':
-				xloginit = true;
+				xlogop = atoi(optarg);
 				break;
 			case 'p':
 				/* indicates fork from postmaster */
@@ -339,40 +339,41 @@ BootstrapMain(int argc, char *argv[])
 	}
 
 	/*
-	 * Bootstrap under Postmaster means two things: (xloginit) ?
-	 * StartupXLOG : ShutdownXLOG
-	 *
-	 * If !under Postmaster and xloginit then BootStrapXLOG.
+	 * XLOG operations
 	 */
-	if (IsUnderPostmaster || xloginit)
+	if (xlogop != BS_XLOG_NOP)
 	{
 		snprintf(XLogDir, MAXPGPATH, "%s/pg_xlog", DataDir);
 		snprintf(ControlFilePath, MAXPGPATH, "%s/global/pg_control", DataDir);
+		if (xlogop == BS_XLOG_BOOTSTRAP)
+			BootStrapXLOG();
+		else
+		{
+			SetProcessingMode(NormalProcessing);
+			if (xlogop == BS_XLOG_STARTUP)
+				StartupXLOG();
+			else if (xlogop == BS_XLOG_CHECKPOINT)
+			{
+#ifdef XLOG
+				extern void CreateDummyCaches(void);
+				CreateDummyCaches();
+#endif
+				CreateCheckPoint(false);
+			}
+			else if (xlogop == BS_XLOG_SHUTDOWN)
+				ShutdownXLOG();
+			else
+				elog(STOP, "Unsupported XLOG op %d", xlogop);
+			proc_exit(0);
+		}
 	}
 
-	if (IsUnderPostmaster && xloginit)
-	{
-		SetProcessingMode(NormalProcessing);
-		StartupXLOG();
-		proc_exit(0);
-	}
-
-	if (!IsUnderPostmaster && xloginit)
-		BootStrapXLOG();
-
 	/*
 	 * backend initialization
 	 */
 	InitPostgres(dbName, NULL);
 	LockDisable(true);
 
-	if (IsUnderPostmaster && !xloginit)
-	{
-		SetProcessingMode(NormalProcessing);
-		ShutdownXLOG();
-		proc_exit(0);
-	}
-
 	for (i = 0; i < MAXATTR; i++)
 	{
 		attrtypes[i] = (Form_pg_attribute) NULL;

src/backend/postmaster/postmaster.c

@@ -11,7 +11,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.180 2000/11/08 17:57:46 petere Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.181 2000/11/09 11:25:59 vadim Exp $
  *
  * NOTES
  *
@@ -78,7 +78,7 @@
 #include "utils/exc.h"
 #include "utils/guc.h"
 #include "utils/memutils.h"
-
+#include "bootstrap/bootstrap.h"
 
 #define INVALID_SOCK	(-1)
 #define ARGV_SIZE	64
@@ -197,8 +197,12 @@ bool NetServer = false;	/* listen on TCP/IP */
 bool EnableSSL = false;
 bool SilentMode = false;	/* silent mode (-S) */
 
-static pid_t StartupPID = 0,
-			ShutdownPID = 0;
+int				CheckPointTimeout = 300;
+
+static pid_t	StartupPID = 0,
+				ShutdownPID = 0,
+				CheckPointPID = 0;
+static time_t	checkpointed = 0;
 
 #define			NoShutdown		0
 #define			SmartShutdown	1
@@ -250,11 +254,11 @@ static void SignalChildren(SIGNAL_ARGS);
 static int	CountChildren(void);
 static bool CreateOptsFile(int argc, char *argv[]);
 
-extern int	BootstrapMain(int argc, char *argv[]);
-static pid_t SSDataBase(bool startup);
+static pid_t SSDataBase(int xlop);
 
-#define StartupDataBase()	SSDataBase(true)
-#define ShutdownDataBase()	SSDataBase(false)
+#define StartupDataBase()		SSDataBase(BS_XLOG_STARTUP)
+#define CheckPointDataBase()	SSDataBase(BS_XLOG_CHECKPOINT)
+#define ShutdownDataBase()		SSDataBase(BS_XLOG_SHUTDOWN)
 
 #ifdef USE_SSL
 static void InitSSL(void);
@@ -814,13 +818,27 @@ ServerLoop(void)
 
 	for (;;)
 	{
-		Port	   *port;
-		fd_set		rmask,
-					wmask;
-		struct timeval *timeout = (struct timeval *) NULL;
-#ifdef USE_SSL
-		struct timeval timeout_tv;
+		Port		   *port;
+		fd_set			rmask,
+						wmask;
+		struct timeval *timeout = NULL;
+		struct timeval	timeout_tv;
+
+		if (CheckPointPID == 0 && checkpointed)
+		{
+			time_t	now = time(NULL);
+
+			if (CheckPointTimeout + checkpointed > now)
+			{
+				timeout_tv.tv_sec = CheckPointTimeout + checkpointed - now;
+				timeout_tv.tv_usec = 0;
+				timeout = &timeout_tv;
+			}
+			else
+				CheckPointPID = CheckPointDataBase();
+		}
 
+#ifdef USE_SSL
 		/*
 		 * If we are using SSL, there may be input data already read and
 		 * pending in SSL's input buffers.  If so, check for additional
@@ -850,6 +868,7 @@ ServerLoop(void)
 
 		if (select(nSockets, &rmask, &wmask, (fd_set *) NULL, timeout) < 0)
 		{
+			PG_SETMASK(&BlockSig);
 			if (errno == EINTR || errno == EWOULDBLOCK)
 				continue;
 			fprintf(stderr, "%s: ServerLoop: select failed: %s\n",
@@ -1186,6 +1205,14 @@ processCancelRequest(Port *port, PacketLen len, void *pkt)
 	backendPID = (int) ntohl(canc->backendPID);
 	cancelAuthCode = (long) ntohl(canc->cancelAuthCode);
 
+	if (backendPID == CheckPointPID)
+	{
+		if (DebugLvl)
+			fprintf(stderr, "%s: processCancelRequest: CheckPointPID in cancel request for process %d\n",
+					progname, backendPID);
+		return STATUS_ERROR;
+	}
+
 	/* See if we have a matching backend */
 
 	for (curr = DLGetHead(BackendList); curr; curr = DLGetSucc(curr))
@@ -1480,6 +1507,9 @@ reaper(SIGNAL_ARGS)
 			 */
 			SetThisStartUpID();
 
+			CheckPointPID = 0;
+			checkpointed = time(NULL);
+
 			pqsignal(SIGCHLD, reaper);
 			return;
 		}
@@ -1563,7 +1593,13 @@ CleanupProc(int pid,
 			curr = DLGetSucc(curr);
 		}
 
-		ProcRemove(pid);
+		if (pid == CheckPointPID)
+		{
+			CheckPointPID = 0;
+			checkpointed = time(NULL);
+		}
+		else
+			ProcRemove(pid);
 
 		return;
 	}
@@ -1612,7 +1648,13 @@ CleanupProc(int pid,
 			 * only, couldn't we just sigpause?), so probably we'll remove
 			 * this call from here someday.  -- vadim 04-10-1999
 			 */
-			ProcRemove(pid);
+			if (pid == CheckPointPID)
+			{
+				CheckPointPID = 0;
+				checkpointed = 0;
+			}
+			else
+				ProcRemove(pid);
 
 			DLRemove(curr);
 			free(bp);
@@ -2090,6 +2132,8 @@ CountChildren(void)
 		if (bp->pid != mypid)
 			cnt++;
 	}
+	if (CheckPointPID != 0)
+		cnt--;
 	return cnt;
 }
 
@@ -2132,10 +2176,11 @@ InitSSL(void)
 #endif
 
 static pid_t
-SSDataBase(bool startup)
+SSDataBase(int xlop)
 {
 	pid_t		pid;
 	int			i;
+	Backend	   *bn;
 	static char ssEntry[4][2 * ARGV_SIZE];
 
 	for (i = 0; i < 4; ++i)
@@ -2159,6 +2204,7 @@ SSDataBase(bool startup)
 		int			ac = 0;
 		char		nbbuf[ARGV_SIZE];
 		char		dbbuf[ARGV_SIZE];
+		char		xlbuf[ARGV_SIZE];
 
 		/* Lose the postmaster's on-exit routines and port connections */
 		on_exit_reset();
@@ -2178,8 +2224,8 @@ SSDataBase(bool startup)
 		sprintf(nbbuf, "-B%u", NBuffers);
 		av[ac++] = nbbuf;
 
-		if (startup)
-			av[ac++] = "-x";
+		sprintf(xlbuf, "-x %d", xlop);
+		av[ac++] = xlbuf;
 
 		av[ac++] = "-p";
 
@@ -2206,12 +2252,28 @@ SSDataBase(bool startup)
 	if (pid < 0)
 	{
 		fprintf(stderr, "%s Data Base: fork failed: %s\n",
-				((startup) ? "Startup" : "Shutdown"), strerror(errno));
+				((xlop == BS_XLOG_STARTUP) ? "Startup" : 
+					((xlop == BS_XLOG_CHECKPOINT) ? "CheckPoint" :
+						"Shutdown")), strerror(errno));
 		ExitPostmaster(1);
 	}
 
 	NextBackendTag -= 1;
 
+	if (xlop != BS_XLOG_CHECKPOINT)
+		return(pid);
+
+	if (!(bn = (Backend *) calloc(1, sizeof(Backend))))
+	{
+		fprintf(stderr, "%s: CheckPointDataBase: malloc failed\n",
+				progname);
+		ExitPostmaster(1);
+	}
+
+	bn->pid = pid;
+	bn->cancel_key = 0;
+	DLAddHead(BackendList, DLNewElem(bn));
+
 	return (pid);
 }
 

src/backend/utils/misc/guc.c

@@ -4,7 +4,7 @@
  * Support for grand unified configuration scheme, including SET
  * command, configuration file, and command line options.
  *
- * $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.15 2000/11/01 21:14:03 petere Exp $
+ * $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.16 2000/11/09 11:25:59 vadim Exp $
  *
  * Copyright 2000 by PostgreSQL Global Development Group
  * Written by Peter Eisentraut <peter_e@gmx.net>.
@@ -36,6 +36,10 @@
 /* XXX should be in a header file */
 extern bool Log_connections;
 
+extern int CheckPointTimeout;
+extern int XLOGbuffers;
+extern int XLOG_DEBUG;
+
 /*
  * Debugging options
  */
@@ -257,6 +261,15 @@ ConfigureNamesInt[] =
 	{"unix_socket_permissions", PGC_POSTMASTER,         &Unix_socket_permissions,
 	 0777, 0000, 0777},
 
+	{"checkpoint_timeout", PGC_POSTMASTER,         &CheckPointTimeout,
+	 300, 30, 1800},
+
+	{"wal_buffers", PGC_POSTMASTER,         &XLOGbuffers,
+	 4, 4, INT_MAX},
+
+	{"wal_debug", PGC_POSTMASTER,         &XLOG_DEBUG,
+	 0, 0, 16},
+
     {NULL, 0, NULL, 0, 0, 0}
 };
 

src/bin/initdb/initdb.sh

@@ -23,7 +23,7 @@
 #
 # Copyright (c) 1994, Regents of the University of California
 #
-# $Header: /cvsroot/pgsql/src/bin/initdb/Attic/initdb.sh,v 1.111 2000/11/06 22:18:09 petere Exp $
+# $Header: /cvsroot/pgsql/src/bin/initdb/Attic/initdb.sh,v 1.112 2000/11/09 11:26:00 vadim Exp $
 #
 #-------------------------------------------------------------------------
 
@@ -440,7 +440,7 @@ else
 fi
 
 BACKENDARGS="-boot -C -F -D$PGDATA $BACKEND_TALK_ARG"
-FIRSTRUN="-boot -x -C -F -D$PGDATA $BACKEND_TALK_ARG"
+FIRSTRUN="-boot -x1 -C -F -D$PGDATA $BACKEND_TALK_ARG"
 
 echo "Creating template database in $PGDATA/base/1"
 [ "$debug" = yes ] && echo "Running: $PGPATH/postgres $FIRSTRUN template1"

src/include/bootstrap/bootstrap.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: bootstrap.h,v 1.19 2000/07/14 22:17:54 tgl Exp $
+ * $Id: bootstrap.h,v 1.20 2000/11/09 11:26:00 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -57,4 +57,10 @@ extern void build_indices(void);
 extern int	Int_yylex(void);
 extern void Int_yyerror(const char *str);
 
+#define BS_XLOG_NOP			0
+#define BS_XLOG_BOOTSTRAP	1
+#define BS_XLOG_STARTUP		2
+#define BS_XLOG_CHECKPOINT	3
+#define BS_XLOG_SHUTDOWN	4
+
 #endif	 /* BOOTSTRAP_H */