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/*-------------------------------------------------------------------------
*
* sharedtuplestore.h
* Simple mechinism for sharing tuples between backends.
*
* Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/utils/sharedtuplestore.h
*
*-------------------------------------------------------------------------
*/
#ifndef SHAREDTUPLESTORE_H
#define SHAREDTUPLESTORE_H
#include "access/htup.h"
#include "storage/fd.h"
#include "storage/sharedfileset.h"
struct SharedTuplestore;
typedef struct SharedTuplestore SharedTuplestore;
struct SharedTuplestoreAccessor;
typedef struct SharedTuplestoreAccessor SharedTuplestoreAccessor;
/*
* A flag indicating that the tuplestore will only be scanned once, so backing
* files can be unlinked early.
*/
#define SHARED_TUPLESTORE_SINGLE_PASS 0x01
extern size_t sts_estimate(int participants);
extern SharedTuplestoreAccessor *sts_initialize(SharedTuplestore *sts,
int participants,
int my_participant_number,
size_t meta_data_size,
int flags,
SharedFileSet *fileset,
const char *name);
extern SharedTuplestoreAccessor *sts_attach(SharedTuplestore *sts,
int my_participant_number,
SharedFileSet *fileset);
extern void sts_end_write(SharedTuplestoreAccessor *accessor);
extern void sts_reinitialize(SharedTuplestoreAccessor *accessor);
extern void sts_begin_parallel_scan(SharedTuplestoreAccessor *accessor);
extern void sts_end_parallel_scan(SharedTuplestoreAccessor *accessor);
extern void sts_puttuple(SharedTuplestoreAccessor *accessor,
void *meta_data,
MinimalTuple tuple);
extern MinimalTuple sts_parallel_scan_next(SharedTuplestoreAccessor *accessor,
void *meta_data);
#endif /* SHAREDTUPLESTORE_H */
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