Adding upstream version 16.2.upstream/16.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 530 insertions, 0 deletions

diff --git a/src/include/access/xact.h b/src/include/access/xact.h
new file mode 100644
index 0000000..7d3b944
--- /dev/null
+++ b/src/include/access/xact.h
@@ -0,0 +1,530 @@
+/*-------------------------------------------------------------------------
+ *
+ * xact.h
+ *	  postgres transaction system definitions
+ *
+ *
+ * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/access/xact.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef XACT_H
+#define XACT_H
+
+#include "access/transam.h"
+#include "access/xlogreader.h"
+#include "datatype/timestamp.h"
+#include "lib/stringinfo.h"
+#include "nodes/pg_list.h"
+#include "storage/relfilelocator.h"
+#include "storage/sinval.h"
+
+/*
+ * Maximum size of Global Transaction ID (including '\0').
+ *
+ * Note that the max value of GIDSIZE must fit in the uint16 gidlen,
+ * specified in TwoPhaseFileHeader.
+ */
+#define GIDSIZE 200
+
+/*
+ * Xact isolation levels
+ */
+#define XACT_READ_UNCOMMITTED	0
+#define XACT_READ_COMMITTED		1
+#define XACT_REPEATABLE_READ	2
+#define XACT_SERIALIZABLE		3
+
+extern PGDLLIMPORT int DefaultXactIsoLevel;
+extern PGDLLIMPORT int XactIsoLevel;
+
+/*
+ * We implement three isolation levels internally.
+ * The two stronger ones use one snapshot per database transaction;
+ * the others use one snapshot per statement.
+ * Serializable uses predicate locks in addition to snapshots.
+ * These macros should be used to check which isolation level is selected.
+ */
+#define IsolationUsesXactSnapshot() (XactIsoLevel >= XACT_REPEATABLE_READ)
+#define IsolationIsSerializable() (XactIsoLevel == XACT_SERIALIZABLE)
+
+/* Xact read-only state */
+extern PGDLLIMPORT bool DefaultXactReadOnly;
+extern PGDLLIMPORT bool XactReadOnly;
+
+/* flag for logging statements in this transaction */
+extern PGDLLIMPORT bool xact_is_sampled;
+
+/*
+ * Xact is deferrable -- only meaningful (currently) for read only
+ * SERIALIZABLE transactions
+ */
+extern PGDLLIMPORT bool DefaultXactDeferrable;
+extern PGDLLIMPORT bool XactDeferrable;
+
+typedef enum
+{
+	SYNCHRONOUS_COMMIT_OFF,		/* asynchronous commit */
+	SYNCHRONOUS_COMMIT_LOCAL_FLUSH, /* wait for local flush only */
+	SYNCHRONOUS_COMMIT_REMOTE_WRITE,	/* wait for local flush and remote
+										 * write */
+	SYNCHRONOUS_COMMIT_REMOTE_FLUSH,	/* wait for local and remote flush */
+	SYNCHRONOUS_COMMIT_REMOTE_APPLY /* wait for local and remote flush and
+									 * remote apply */
+}			SyncCommitLevel;
+
+/* Define the default setting for synchronous_commit */
+#define SYNCHRONOUS_COMMIT_ON	SYNCHRONOUS_COMMIT_REMOTE_FLUSH
+
+/* Synchronous commit level */
+extern PGDLLIMPORT int synchronous_commit;
+
+/* used during logical streaming of a transaction */
+extern PGDLLIMPORT TransactionId CheckXidAlive;
+extern PGDLLIMPORT bool bsysscan;
+
+/*
+ * Miscellaneous flag bits to record events which occur on the top level
+ * transaction. These flags are only persisted in MyXactFlags and are intended
+ * so we remember to do certain things later in the transaction. This is
+ * globally accessible, so can be set from anywhere in the code which requires
+ * recording flags.
+ */
+extern PGDLLIMPORT int MyXactFlags;
+
+/*
+ * XACT_FLAGS_ACCESSEDTEMPNAMESPACE - set when a temporary object is accessed.
+ * We don't allow PREPARE TRANSACTION in that case.
+ */
+#define XACT_FLAGS_ACCESSEDTEMPNAMESPACE		(1U << 0)
+
+/*
+ * XACT_FLAGS_ACQUIREDACCESSEXCLUSIVELOCK - records whether the top level xact
+ * logged any Access Exclusive Locks.
+ */
+#define XACT_FLAGS_ACQUIREDACCESSEXCLUSIVELOCK	(1U << 1)
+
+/*
+ * XACT_FLAGS_NEEDIMMEDIATECOMMIT - records whether the top level statement
+ * is one that requires immediate commit, such as CREATE DATABASE.
+ */
+#define XACT_FLAGS_NEEDIMMEDIATECOMMIT			(1U << 2)
+
+/*
+ * XACT_FLAGS_PIPELINING - set when we complete an extended-query-protocol
+ * Execute message.  This is useful for detecting that an implicit transaction
+ * block has been created via pipelining.
+ */
+#define XACT_FLAGS_PIPELINING					(1U << 3)
+
+/*
+ *	start- and end-of-transaction callbacks for dynamically loaded modules
+ */
+typedef enum
+{
+	XACT_EVENT_COMMIT,
+	XACT_EVENT_PARALLEL_COMMIT,
+	XACT_EVENT_ABORT,
+	XACT_EVENT_PARALLEL_ABORT,
+	XACT_EVENT_PREPARE,
+	XACT_EVENT_PRE_COMMIT,
+	XACT_EVENT_PARALLEL_PRE_COMMIT,
+	XACT_EVENT_PRE_PREPARE
+} XactEvent;
+
+typedef void (*XactCallback) (XactEvent event, void *arg);
+
+typedef enum
+{
+	SUBXACT_EVENT_START_SUB,
+	SUBXACT_EVENT_COMMIT_SUB,
+	SUBXACT_EVENT_ABORT_SUB,
+	SUBXACT_EVENT_PRE_COMMIT_SUB
+} SubXactEvent;
+
+typedef void (*SubXactCallback) (SubXactEvent event, SubTransactionId mySubid,
+								 SubTransactionId parentSubid, void *arg);
+
+/* Data structure for Save/RestoreTransactionCharacteristics */
+typedef struct SavedTransactionCharacteristics
+{
+	int			save_XactIsoLevel;
+	bool		save_XactReadOnly;
+	bool		save_XactDeferrable;
+} SavedTransactionCharacteristics;
+
+
+/* ----------------
+ *		transaction-related XLOG entries
+ * ----------------
+ */
+
+/*
+ * XLOG allows to store some information in high 4 bits of log record xl_info
+ * field. We use 3 for the opcode, and one about an optional flag variable.
+ */
+#define XLOG_XACT_COMMIT			0x00
+#define XLOG_XACT_PREPARE			0x10
+#define XLOG_XACT_ABORT				0x20
+#define XLOG_XACT_COMMIT_PREPARED	0x30
+#define XLOG_XACT_ABORT_PREPARED	0x40
+#define XLOG_XACT_ASSIGNMENT		0x50
+#define XLOG_XACT_INVALIDATIONS		0x60
+/* free opcode 0x70 */
+
+/* mask for filtering opcodes out of xl_info */
+#define XLOG_XACT_OPMASK			0x70
+
+/* does this record have a 'xinfo' field or not */
+#define XLOG_XACT_HAS_INFO			0x80
+
+/*
+ * The following flags, stored in xinfo, determine which information is
+ * contained in commit/abort records.
+ */
+#define XACT_XINFO_HAS_DBINFO			(1U << 0)
+#define XACT_XINFO_HAS_SUBXACTS			(1U << 1)
+#define XACT_XINFO_HAS_RELFILELOCATORS	(1U << 2)
+#define XACT_XINFO_HAS_INVALS			(1U << 3)
+#define XACT_XINFO_HAS_TWOPHASE			(1U << 4)
+#define XACT_XINFO_HAS_ORIGIN			(1U << 5)
+#define XACT_XINFO_HAS_AE_LOCKS			(1U << 6)
+#define XACT_XINFO_HAS_GID				(1U << 7)
+#define XACT_XINFO_HAS_DROPPED_STATS	(1U << 8)
+
+/*
+ * Also stored in xinfo, these indicating a variety of additional actions that
+ * need to occur when emulating transaction effects during recovery.
+ *
+ * They are named XactCompletion... to differentiate them from
+ * EOXact... routines which run at the end of the original transaction
+ * completion.
+ */
+#define XACT_COMPLETION_APPLY_FEEDBACK			(1U << 29)
+#define XACT_COMPLETION_UPDATE_RELCACHE_FILE	(1U << 30)
+#define XACT_COMPLETION_FORCE_SYNC_COMMIT		(1U << 31)
+
+/* Access macros for above flags */
+#define XactCompletionApplyFeedback(xinfo) \
+	((xinfo & XACT_COMPLETION_APPLY_FEEDBACK) != 0)
+#define XactCompletionRelcacheInitFileInval(xinfo) \
+	((xinfo & XACT_COMPLETION_UPDATE_RELCACHE_FILE) != 0)
+#define XactCompletionForceSyncCommit(xinfo) \
+	((xinfo & XACT_COMPLETION_FORCE_SYNC_COMMIT) != 0)
+
+typedef struct xl_xact_assignment
+{
+	TransactionId xtop;			/* assigned XID's top-level XID */
+	int			nsubxacts;		/* number of subtransaction XIDs */
+	TransactionId xsub[FLEXIBLE_ARRAY_MEMBER];	/* assigned subxids */
+} xl_xact_assignment;
+
+#define MinSizeOfXactAssignment offsetof(xl_xact_assignment, xsub)
+
+/*
+ * Commit and abort records can contain a lot of information. But a large
+ * portion of the records won't need all possible pieces of information. So we
+ * only include what's needed.
+ *
+ * A minimal commit/abort record only consists of a xl_xact_commit/abort
+ * struct. The presence of additional information is indicated by bits set in
+ * 'xl_xact_xinfo->xinfo'. The presence of the xinfo field itself is signaled
+ * by a set XLOG_XACT_HAS_INFO bit in the xl_info field.
+ *
+ * NB: All the individual data chunks should be sized to multiples of
+ * sizeof(int) and only require int32 alignment. If they require bigger
+ * alignment, they need to be copied upon reading.
+ */
+
+/* sub-records for commit/abort */
+
+typedef struct xl_xact_xinfo
+{
+	/*
+	 * Even though we right now only require two bytes of space in xinfo we
+	 * use four so following records don't have to care about alignment.
+	 * Commit records can be large, so copying large portions isn't
+	 * attractive.
+	 */
+	uint32		xinfo;
+} xl_xact_xinfo;
+
+typedef struct xl_xact_dbinfo
+{
+	Oid			dbId;			/* MyDatabaseId */
+	Oid			tsId;			/* MyDatabaseTableSpace */
+} xl_xact_dbinfo;
+
+typedef struct xl_xact_subxacts
+{
+	int			nsubxacts;		/* number of subtransaction XIDs */
+	TransactionId subxacts[FLEXIBLE_ARRAY_MEMBER];
+} xl_xact_subxacts;
+#define MinSizeOfXactSubxacts offsetof(xl_xact_subxacts, subxacts)
+
+typedef struct xl_xact_relfilelocators
+{
+	int			nrels;			/* number of relations */
+	RelFileLocator xlocators[FLEXIBLE_ARRAY_MEMBER];
+} xl_xact_relfilelocators;
+#define MinSizeOfXactRelfileLocators offsetof(xl_xact_relfilelocators, xlocators)
+
+/*
+ * A transactionally dropped statistics entry.
+ *
+ * Declared here rather than pgstat.h because pgstat.h can't be included from
+ * frontend code, but the WAL format needs to be readable by frontend
+ * programs.
+ */
+typedef struct xl_xact_stats_item
+{
+	int			kind;
+	Oid			dboid;
+	Oid			objoid;
+} xl_xact_stats_item;
+
+typedef struct xl_xact_stats_items
+{
+	int			nitems;
+	xl_xact_stats_item items[FLEXIBLE_ARRAY_MEMBER];
+} xl_xact_stats_items;
+#define MinSizeOfXactStatsItems offsetof(xl_xact_stats_items, items)
+
+typedef struct xl_xact_invals
+{
+	int			nmsgs;			/* number of shared inval msgs */
+	SharedInvalidationMessage msgs[FLEXIBLE_ARRAY_MEMBER];
+} xl_xact_invals;
+#define MinSizeOfXactInvals offsetof(xl_xact_invals, msgs)
+
+typedef struct xl_xact_twophase
+{
+	TransactionId xid;
+} xl_xact_twophase;
+
+typedef struct xl_xact_origin
+{
+	XLogRecPtr	origin_lsn;
+	TimestampTz origin_timestamp;
+} xl_xact_origin;
+
+typedef struct xl_xact_commit
+{
+	TimestampTz xact_time;		/* time of commit */
+
+	/* xl_xact_xinfo follows if XLOG_XACT_HAS_INFO */
+	/* xl_xact_dbinfo follows if XINFO_HAS_DBINFO */
+	/* xl_xact_subxacts follows if XINFO_HAS_SUBXACT */
+	/* xl_xact_relfilelocators follows if XINFO_HAS_RELFILELOCATORS */
+	/* xl_xact_stats_items follows if XINFO_HAS_DROPPED_STATS */
+	/* xl_xact_invals follows if XINFO_HAS_INVALS */
+	/* xl_xact_twophase follows if XINFO_HAS_TWOPHASE */
+	/* twophase_gid follows if XINFO_HAS_GID. As a null-terminated string. */
+	/* xl_xact_origin follows if XINFO_HAS_ORIGIN, stored unaligned! */
+} xl_xact_commit;
+#define MinSizeOfXactCommit (offsetof(xl_xact_commit, xact_time) + sizeof(TimestampTz))
+
+typedef struct xl_xact_abort
+{
+	TimestampTz xact_time;		/* time of abort */
+
+	/* xl_xact_xinfo follows if XLOG_XACT_HAS_INFO */
+	/* xl_xact_dbinfo follows if XINFO_HAS_DBINFO */
+	/* xl_xact_subxacts follows if XINFO_HAS_SUBXACT */
+	/* xl_xact_relfilelocators follows if XINFO_HAS_RELFILELOCATORS */
+	/* xl_xact_stats_items follows if XINFO_HAS_DROPPED_STATS */
+	/* No invalidation messages needed. */
+	/* xl_xact_twophase follows if XINFO_HAS_TWOPHASE */
+	/* twophase_gid follows if XINFO_HAS_GID. As a null-terminated string. */
+	/* xl_xact_origin follows if XINFO_HAS_ORIGIN, stored unaligned! */
+} xl_xact_abort;
+#define MinSizeOfXactAbort sizeof(xl_xact_abort)
+
+typedef struct xl_xact_prepare
+{
+	uint32		magic;			/* format identifier */
+	uint32		total_len;		/* actual file length */
+	TransactionId xid;			/* original transaction XID */
+	Oid			database;		/* OID of database it was in */
+	TimestampTz prepared_at;	/* time of preparation */
+	Oid			owner;			/* user running the transaction */
+	int32		nsubxacts;		/* number of following subxact XIDs */
+	int32		ncommitrels;	/* number of delete-on-commit rels */
+	int32		nabortrels;		/* number of delete-on-abort rels */
+	int32		ncommitstats;	/* number of stats to drop on commit */
+	int32		nabortstats;	/* number of stats to drop on abort */
+	int32		ninvalmsgs;		/* number of cache invalidation messages */
+	bool		initfileinval;	/* does relcache init file need invalidation? */
+	uint16		gidlen;			/* length of the GID - GID follows the header */
+	XLogRecPtr	origin_lsn;		/* lsn of this record at origin node */
+	TimestampTz origin_timestamp;	/* time of prepare at origin node */
+} xl_xact_prepare;
+
+/*
+ * Commit/Abort records in the above form are a bit verbose to parse, so
+ * there's a deconstructed versions generated by ParseCommit/AbortRecord() for
+ * easier consumption.
+ */
+typedef struct xl_xact_parsed_commit
+{
+	TimestampTz xact_time;
+	uint32		xinfo;
+
+	Oid			dbId;			/* MyDatabaseId */
+	Oid			tsId;			/* MyDatabaseTableSpace */
+
+	int			nsubxacts;
+	TransactionId *subxacts;
+
+	int			nrels;
+	RelFileLocator *xlocators;
+
+	int			nstats;
+	xl_xact_stats_item *stats;
+
+	int			nmsgs;
+	SharedInvalidationMessage *msgs;
+
+	TransactionId twophase_xid; /* only for 2PC */
+	char		twophase_gid[GIDSIZE];	/* only for 2PC */
+	int			nabortrels;		/* only for 2PC */
+	RelFileLocator *abortlocators;	/* only for 2PC */
+	int			nabortstats;	/* only for 2PC */
+	xl_xact_stats_item *abortstats; /* only for 2PC */
+
+	XLogRecPtr	origin_lsn;
+	TimestampTz origin_timestamp;
+} xl_xact_parsed_commit;
+
+typedef xl_xact_parsed_commit xl_xact_parsed_prepare;
+
+typedef struct xl_xact_parsed_abort
+{
+	TimestampTz xact_time;
+	uint32		xinfo;
+
+	Oid			dbId;			/* MyDatabaseId */
+	Oid			tsId;			/* MyDatabaseTableSpace */
+
+	int			nsubxacts;
+	TransactionId *subxacts;
+
+	int			nrels;
+	RelFileLocator *xlocators;
+
+	int			nstats;
+	xl_xact_stats_item *stats;
+
+	TransactionId twophase_xid; /* only for 2PC */
+	char		twophase_gid[GIDSIZE];	/* only for 2PC */
+
+	XLogRecPtr	origin_lsn;
+	TimestampTz origin_timestamp;
+} xl_xact_parsed_abort;
+
+
+/* ----------------
+ *		extern definitions
+ * ----------------
+ */
+extern bool IsTransactionState(void);
+extern bool IsAbortedTransactionBlockState(void);
+extern TransactionId GetTopTransactionId(void);
+extern TransactionId GetTopTransactionIdIfAny(void);
+extern TransactionId GetCurrentTransactionId(void);
+extern TransactionId GetCurrentTransactionIdIfAny(void);
+extern TransactionId GetStableLatestTransactionId(void);
+extern SubTransactionId GetCurrentSubTransactionId(void);
+extern FullTransactionId GetTopFullTransactionId(void);
+extern FullTransactionId GetTopFullTransactionIdIfAny(void);
+extern FullTransactionId GetCurrentFullTransactionId(void);
+extern FullTransactionId GetCurrentFullTransactionIdIfAny(void);
+extern void MarkCurrentTransactionIdLoggedIfAny(void);
+extern bool SubTransactionIsActive(SubTransactionId subxid);
+extern CommandId GetCurrentCommandId(bool used);
+extern void SetParallelStartTimestamps(TimestampTz xact_ts, TimestampTz stmt_ts);
+extern TimestampTz GetCurrentTransactionStartTimestamp(void);
+extern TimestampTz GetCurrentStatementStartTimestamp(void);
+extern TimestampTz GetCurrentTransactionStopTimestamp(void);
+extern void SetCurrentStatementStartTimestamp(void);
+extern int	GetCurrentTransactionNestLevel(void);
+extern bool TransactionIdIsCurrentTransactionId(TransactionId xid);
+extern void CommandCounterIncrement(void);
+extern void ForceSyncCommit(void);
+extern void StartTransactionCommand(void);
+extern void SaveTransactionCharacteristics(SavedTransactionCharacteristics *s);
+extern void RestoreTransactionCharacteristics(const SavedTransactionCharacteristics *s);
+extern void CommitTransactionCommand(void);
+extern void AbortCurrentTransaction(void);
+extern void BeginTransactionBlock(void);
+extern bool EndTransactionBlock(bool chain);
+extern bool PrepareTransactionBlock(const char *gid);
+extern void UserAbortTransactionBlock(bool chain);
+extern void BeginImplicitTransactionBlock(void);
+extern void EndImplicitTransactionBlock(void);
+extern void ReleaseSavepoint(const char *name);
+extern void DefineSavepoint(const char *name);
+extern void RollbackToSavepoint(const char *name);
+extern void BeginInternalSubTransaction(const char *name);
+extern void ReleaseCurrentSubTransaction(void);
+extern void RollbackAndReleaseCurrentSubTransaction(void);
+extern bool IsSubTransaction(void);
+extern Size EstimateTransactionStateSpace(void);
+extern void SerializeTransactionState(Size maxsize, char *start_address);
+extern void StartParallelWorkerTransaction(char *tstatespace);
+extern void EndParallelWorkerTransaction(void);
+extern bool IsTransactionBlock(void);
+extern bool IsTransactionOrTransactionBlock(void);
+extern char TransactionBlockStatusCode(void);
+extern void AbortOutOfAnyTransaction(void);
+extern void PreventInTransactionBlock(bool isTopLevel, const char *stmtType);
+extern void RequireTransactionBlock(bool isTopLevel, const char *stmtType);
+extern void WarnNoTransactionBlock(bool isTopLevel, const char *stmtType);
+extern bool IsInTransactionBlock(bool isTopLevel);
+extern void RegisterXactCallback(XactCallback callback, void *arg);
+extern void UnregisterXactCallback(XactCallback callback, void *arg);
+extern void RegisterSubXactCallback(SubXactCallback callback, void *arg);
+extern void UnregisterSubXactCallback(SubXactCallback callback, void *arg);
+
+extern bool IsSubxactTopXidLogPending(void);
+extern void MarkSubxactTopXidLogged(void);
+
+extern int	xactGetCommittedChildren(TransactionId **ptr);
+
+extern XLogRecPtr XactLogCommitRecord(TimestampTz commit_time,
+									  int nsubxacts, TransactionId *subxacts,
+									  int nrels, RelFileLocator *rels,
+									  int ndroppedstats,
+									  xl_xact_stats_item *droppedstats,
+									  int nmsgs, SharedInvalidationMessage *msgs,
+									  bool relcacheInval,
+									  int xactflags,
+									  TransactionId twophase_xid,
+									  const char *twophase_gid);
+
+extern XLogRecPtr XactLogAbortRecord(TimestampTz abort_time,
+									 int nsubxacts, TransactionId *subxacts,
+									 int nrels, RelFileLocator *rels,
+									 int ndroppedstats,
+									 xl_xact_stats_item *droppedstats,
+									 int xactflags, TransactionId twophase_xid,
+									 const char *twophase_gid);
+extern void xact_redo(XLogReaderState *record);
+
+/* xactdesc.c */
+extern void xact_desc(StringInfo buf, XLogReaderState *record);
+extern const char *xact_identify(uint8 info);
+
+/* also in xactdesc.c, so they can be shared between front/backend code */
+extern void ParseCommitRecord(uint8 info, xl_xact_commit *xlrec, xl_xact_parsed_commit *parsed);
+extern void ParseAbortRecord(uint8 info, xl_xact_abort *xlrec, xl_xact_parsed_abort *parsed);
+extern void ParsePrepareRecord(uint8 info, xl_xact_prepare *xlrec, xl_xact_parsed_prepare *parsed);
+
+extern void EnterParallelMode(void);
+extern void ExitParallelMode(void);
+extern bool IsInParallelMode(void);
+
+#endif							/* XACT_H */