3 files changed, 36 insertions, 1 deletions
diff --git a/src/include/executor/tqueue.h b/src/include/executor/tqueue.h
new file mode 100644
index 00000000000..6f8eb73c9ae
--- /dev/null
+++ b/src/include/executor/tqueue.h
@@ -0,0 +1,31 @@
+/*-------------------------------------------------------------------------
+ *
+ * tqueue.h
+ *	  Use shm_mq to send & receive tuples between parallel backends
+ *
+ * Portions Copyright (c) 1996-2015, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/executor/tqueue.h
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef TQUEUE_H
+#define TQUEUE_H
+
+#include "storage/shm_mq.h"
+#include "tcop/dest.h"
+
+/* Use this to send tuples to a shm_mq. */
+extern DestReceiver *CreateTupleQueueDestReceiver(shm_mq_handle *handle);
+
+/* Use these to receive tuples from a shm_mq. */
+typedef struct TupleQueueFunnel TupleQueueFunnel;
+extern TupleQueueFunnel *CreateTupleQueueFunnel(void);
+extern void DestroyTupleQueueFunnel(TupleQueueFunnel *funnel);
+extern void RegisterTupleQueueOnFunnel(TupleQueueFunnel *, shm_mq_handle *);
+extern HeapTuple TupleQueueFunnelNext(TupleQueueFunnel *, bool nowait,
+					 bool *done);
+
+#endif   /* TQUEUE_H */
diff --git a/src/include/storage/shm_mq.h b/src/include/storage/shm_mq.h
index 1a2ba040cb4..7621a358ab4 100644
--- a/src/include/storage/shm_mq.h
+++ b/src/include/storage/shm_mq.h
@@ -65,6 +65,9 @@ extern void shm_mq_set_handle(shm_mq_handle *, BackgroundWorkerHandle *);
 /* Break connection. */
 extern void shm_mq_detach(shm_mq *);
 
+/* Get the shm_mq from handle. */
+extern shm_mq *shm_mq_get_queue(shm_mq_handle *mqh);
+
 /* Send or receive messages. */
 extern shm_mq_result shm_mq_send(shm_mq_handle *mqh,
 			Size nbytes, const void *data, bool nowait);
diff --git a/src/include/tcop/dest.h b/src/include/tcop/dest.h
index 5bcca3fbcaa..b560672fd40 100644
--- a/src/include/tcop/dest.h
+++ b/src/include/tcop/dest.h
@@ -94,7 +94,8 @@ typedef enum
 	DestIntoRel,				/* results sent to relation (SELECT INTO) */
 	DestCopyOut,				/* results sent to COPY TO code */
 	DestSQLFunction,			/* results sent to SQL-language func mgr */
-	DestTransientRel			/* results sent to transient relation */
+	DestTransientRel,			/* results sent to transient relation */
+	DestTupleQueue				/* results sent to tuple queue */
 } CommandDest;
 
 /* ----------------