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diff --git a/src/include/access/twophase_rmgr.h b/src/include/access/twophase_rmgr.h
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+++ b/src/include/access/twophase_rmgr.h
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+/*-------------------------------------------------------------------------
+ *
+ * twophase_rmgr.h
+ * Two-phase-commit resource managers definition
+ *
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/access/twophase_rmgr.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef TWOPHASE_RMGR_H
+#define TWOPHASE_RMGR_H
+
+typedef void (*TwoPhaseCallback) (TransactionId xid, uint16 info,
+ void *recdata, uint32 len);
+typedef uint8 TwoPhaseRmgrId;
+
+/*
+ * Built-in resource managers
+ */
+#define TWOPHASE_RM_END_ID 0
+#define TWOPHASE_RM_LOCK_ID 1
+#define TWOPHASE_RM_PGSTAT_ID 2
+#define TWOPHASE_RM_MULTIXACT_ID 3
+#define TWOPHASE_RM_PREDICATELOCK_ID 4
+#define TWOPHASE_RM_MAX_ID TWOPHASE_RM_PREDICATELOCK_ID
+
+extern const TwoPhaseCallback twophase_recover_callbacks[];
+extern const TwoPhaseCallback twophase_postcommit_callbacks[];
+extern const TwoPhaseCallback twophase_postabort_callbacks[];
+extern const TwoPhaseCallback twophase_standby_recover_callbacks[];
+
+
+extern void RegisterTwoPhaseRecord(TwoPhaseRmgrId rmid, uint16 info,
+ const void *data, uint32 len);
+
+#endif /* TWOPHASE_RMGR_H */