init

db_include/executor/tqueue.h

@@ -0,0 +1,32 @@
+/*-------------------------------------------------------------------------
+ *
+ * tqueue.h
+ *	  Use shm_mq to send & receive tuples between parallel backends
+ *
+ * Portions Copyright (c) 1996-2021, 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"
+
+/* Opaque struct, only known inside tqueue.c. */
+typedef struct TupleQueueReader TupleQueueReader;
+
+/* 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. */
+extern TupleQueueReader *CreateTupleQueueReader(shm_mq_handle *handle);
+extern void DestroyTupleQueueReader(TupleQueueReader *reader);
+extern MinimalTuple TupleQueueReaderNext(TupleQueueReader *reader,
+										 bool nowait, bool *done);
+
+#endif							/* TQUEUE_H */