62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
/*-------------------------------------------------------------------------
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*
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* sharedtuplestore.h
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* Simple mechanism for sharing tuples between backends.
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*
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* Portions Copyright (c) 1996-2019, 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/utils/sharedtuplestore.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef SHAREDTUPLESTORE_H
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#define SHAREDTUPLESTORE_H
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#include "access/htup.h"
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#include "storage/fd.h"
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#include "storage/sharedfileset.h"
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struct SharedTuplestore;
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typedef struct SharedTuplestore SharedTuplestore;
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struct SharedTuplestoreAccessor;
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typedef struct SharedTuplestoreAccessor SharedTuplestoreAccessor;
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/*
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* A flag indicating that the tuplestore will only be scanned once, so backing
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* files can be unlinked early.
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*/
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#define SHARED_TUPLESTORE_SINGLE_PASS 0x01
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extern size_t sts_estimate(int participants);
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extern SharedTuplestoreAccessor *sts_initialize(SharedTuplestore *sts,
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int participants,
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int my_participant_number,
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size_t meta_data_size,
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int flags,
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SharedFileSet *fileset,
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const char *name);
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extern SharedTuplestoreAccessor *sts_attach(SharedTuplestore *sts,
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int my_participant_number,
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SharedFileSet *fileset);
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extern void sts_end_write(SharedTuplestoreAccessor *accessor);
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extern void sts_reinitialize(SharedTuplestoreAccessor *accessor);
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extern void sts_begin_parallel_scan(SharedTuplestoreAccessor *accessor);
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extern void sts_end_parallel_scan(SharedTuplestoreAccessor *accessor);
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extern void sts_puttuple(SharedTuplestoreAccessor *accessor,
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void *meta_data,
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MinimalTuple tuple);
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extern MinimalTuple sts_parallel_scan_next(SharedTuplestoreAccessor *accessor,
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void *meta_data);
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#endif /* SHAREDTUPLESTORE_H */
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