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diff --git a/src/include/access/parallel.h b/src/include/access/parallel.h
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+++ b/src/include/access/parallel.h
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+/*-------------------------------------------------------------------------
+ *
+ * parallel.h
+ *	  Infrastructure for launching parallel workers
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/access/parallel.h
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef PARALLEL_H
+#define PARALLEL_H
+
+#include "access/xlogdefs.h"
+#include "lib/ilist.h"
+#include "postmaster/bgworker.h"
+#include "storage/shm_mq.h"
+#include "storage/shm_toc.h"
+
+typedef void (*parallel_worker_main_type) (dsm_segment *seg, shm_toc *toc);
+
+typedef struct ParallelWorkerInfo
+{
+	BackgroundWorkerHandle *bgwhandle;
+	shm_mq_handle *error_mqh;
+	int32		pid;
+} ParallelWorkerInfo;
+
+typedef struct ParallelContext
+{
+	dlist_node	node;
+	SubTransactionId subid;
+	int			nworkers;		/* Maximum number of workers to launch */
+	int			nworkers_to_launch; /* Actual number of workers to launch */
+	int			nworkers_launched;
+	char	   *library_name;
+	char	   *function_name;
+	ErrorContextCallback *error_context_stack;
+	shm_toc_estimator estimator;
+	dsm_segment *seg;
+	void	   *private_memory;
+	shm_toc    *toc;
+	ParallelWorkerInfo *worker;
+	int			nknown_attached_workers;
+	bool	   *known_attached_workers;
+} ParallelContext;
+
+typedef struct ParallelWorkerContext
+{
+	dsm_segment *seg;
+	shm_toc    *toc;
+} ParallelWorkerContext;
+
+extern volatile bool ParallelMessagePending;
+extern PGDLLIMPORT int ParallelWorkerNumber;
+extern PGDLLIMPORT bool InitializingParallelWorker;
+
+#define		IsParallelWorker()		(ParallelWorkerNumber >= 0)
+
+extern ParallelContext *CreateParallelContext(const char *library_name,
+											  const char *function_name, int nworkers);
+extern void InitializeParallelDSM(ParallelContext *pcxt);
+extern void ReinitializeParallelDSM(ParallelContext *pcxt);
+extern void ReinitializeParallelWorkers(ParallelContext *pcxt, int nworkers_to_launch);
+extern void LaunchParallelWorkers(ParallelContext *pcxt);
+extern void WaitForParallelWorkersToAttach(ParallelContext *pcxt);
+extern void WaitForParallelWorkersToFinish(ParallelContext *pcxt);
+extern void DestroyParallelContext(ParallelContext *pcxt);
+extern bool ParallelContextActive(void);
+
+extern void HandleParallelMessageInterrupt(void);
+extern void HandleParallelMessages(void);
+extern void AtEOXact_Parallel(bool isCommit);
+extern void AtEOSubXact_Parallel(bool isCommit, SubTransactionId mySubId);
+extern void ParallelWorkerReportLastRecEnd(XLogRecPtr last_xlog_end);
+
+extern void ParallelWorkerMain(Datum main_arg);
+
+#endif							/* PARALLEL_H */