tqueue.h

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/*-------------------------------------------------------------------------
 *
 * tqueue.h
 *    Use shm_mq to send & receive tuples between parallel backends
 *
 * Portions Copyright (c) 1996-2024, 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 */