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32 lines
1 KiB
C
32 lines
1 KiB
C
/*-------------------------------------------------------------------------
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*
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* tqueue.h
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* Use shm_mq to send & receive tuples between parallel backends
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*
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* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/executor/tqueue.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef TQUEUE_H
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#define TQUEUE_H
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#include "storage/shm_mq.h"
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#include "tcop/dest.h"
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/* Opaque struct, only known inside tqueue.c. */
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typedef struct TupleQueueReader TupleQueueReader;
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/* Use this to send tuples to a shm_mq. */
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extern DestReceiver *CreateTupleQueueDestReceiver(shm_mq_handle *handle);
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/* Use these to receive tuples from a shm_mq. */
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extern TupleQueueReader *CreateTupleQueueReader(shm_mq_handle *handle);
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extern void DestroyTupleQueueReader(TupleQueueReader *reader);
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extern HeapTuple TupleQueueReaderNext(TupleQueueReader *reader,
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bool nowait, bool *done);
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#endif /* TQUEUE_H */
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