init

db_include/access/clog.h

@@ -0,0 +1,63 @@
+/*
+ * clog.h
+ *
+ * PostgreSQL transaction-commit-log manager
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/access/clog.h
+ */
+#ifndef CLOG_H
+#define CLOG_H
+
+#include "access/xlogreader.h"
+#include "storage/sync.h"
+#include "lib/stringinfo.h"
+
+/*
+ * Possible transaction statuses --- note that all-zeroes is the initial
+ * state.
+ *
+ * A "subcommitted" transaction is a committed subtransaction whose parent
+ * hasn't committed or aborted yet.
+ */
+typedef int XidStatus;
+
+#define TRANSACTION_STATUS_IN_PROGRESS		0x00
+#define TRANSACTION_STATUS_COMMITTED		0x01
+#define TRANSACTION_STATUS_ABORTED			0x02
+#define TRANSACTION_STATUS_SUB_COMMITTED	0x03
+
+typedef struct xl_clog_truncate
+{
+	int			pageno;
+	TransactionId oldestXact;
+	Oid			oldestXactDb;
+} xl_clog_truncate;
+
+extern void TransactionIdSetTreeStatus(TransactionId xid, int nsubxids,
+									   TransactionId *subxids, XidStatus status, XLogRecPtr lsn);
+extern XidStatus TransactionIdGetStatus(TransactionId xid, XLogRecPtr *lsn);
+
+extern Size CLOGShmemBuffers(void);
+extern Size CLOGShmemSize(void);
+extern void CLOGShmemInit(void);
+extern void BootStrapCLOG(void);
+extern void StartupCLOG(void);
+extern void TrimCLOG(void);
+extern void CheckPointCLOG(void);
+extern void ExtendCLOG(TransactionId newestXact);
+extern void TruncateCLOG(TransactionId oldestXact, Oid oldestxid_datoid);
+
+extern int	clogsyncfiletag(const FileTag *ftag, char *path);
+
+/* XLOG stuff */
+#define CLOG_ZEROPAGE		0x00
+#define CLOG_TRUNCATE		0x10
+
+extern void clog_redo(XLogReaderState *record);
+extern void clog_desc(StringInfo buf, XLogReaderState *record);
+extern const char *clog_identify(uint8 info);
+
+#endif							/* CLOG_H */