46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
/*-------------------------------------------------------------------------
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*
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* sharedfileset.h
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* Shared temporary file management.
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*
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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/storage/sharedfileset.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef SHAREDFILESET_H
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#define SHAREDFILESET_H
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#include "storage/dsm.h"
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#include "storage/fd.h"
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#include "storage/spin.h"
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/*
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* A set of temporary files that can be shared by multiple backends.
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*/
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typedef struct SharedFileSet
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{
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pid_t creator_pid; /* PID of the creating process */
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uint32 number; /* per-PID identifier */
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slock_t mutex; /* mutex protecting the reference count */
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int refcnt; /* number of attached backends */
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int ntablespaces; /* number of tablespaces to use */
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Oid tablespaces[8]; /* OIDs of tablespaces to use. Assumes that
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* it's rare that there more than temp
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* tablespaces. */
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} SharedFileSet;
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extern void SharedFileSetInit(SharedFileSet *fileset, dsm_segment *seg);
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extern void SharedFileSetAttach(SharedFileSet *fileset, dsm_segment *seg);
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extern File SharedFileSetCreate(SharedFileSet *fileset, const char *name);
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extern File SharedFileSetOpen(SharedFileSet *fileset, const char *name);
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extern bool SharedFileSetDelete(SharedFileSet *fileset, const char *name,
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bool error_on_failure);
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extern void SharedFileSetDeleteAll(SharedFileSet *fileset);
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#endif
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