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/*-------------------------------------------------------------------------
*
* 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 */
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