sharedtuplestore.h

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/*-------------------------------------------------------------------------
 *
 * sharedtuplestore.h
 *    Simple mechanism for sharing tuples between backends.
 *
 * Portions Copyright (c) 1996-2024, 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 */