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Current File : //proc/thread-self/root/proc/self/root/usr/pgsql-11/include/server/executor/tqueue.h
/*-------------------------------------------------------------------------
 *
 * tqueue.h
 *	  Use shm_mq to send & receive tuples between parallel backends
 *
 * Portions Copyright (c) 1996-2018, 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 HeapTuple TupleQueueReaderNext(TupleQueueReader *reader,
					 bool nowait, bool *done);

#endif							/* TQUEUE_H */

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