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/*-------------------------------------------------------------------------
*
* tqueue.h
* Use shm_mq to send & receive tuples between parallel backends
*
* Portions Copyright (c) 1996-2020, 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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