greenplumn sharedfileset 源码
greenplumn sharedfileset 代码
文件路径：/src/include/storage/sharedfileset.h
/*-------------------------------------------------------------------------
*
* sharedfileset.h
* Shared temporary file management.
*
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/storage/sharedfileset.h
*
*-------------------------------------------------------------------------
*/
#ifndef SHAREDFILESET_H
#define SHAREDFILESET_H
#include "storage/dsm.h"
#include "storage/fd.h"
#include "storage/spin.h"
/*
* A set of temporary files that can be shared by multiple backends.
*/
typedef struct SharedFileSet
{
pid_t creator_pid; /* PID of the creating process */
uint32 number; /* per-PID identifier */
slock_t mutex; /* mutex protecting the reference count */
int refcnt; /* number of attached backends */
int ntablespaces; /* number of tablespaces to use */
Oid tablespaces[8]; /* OIDs of tablespaces to use. Assumes that
* it's rare that there more than temp
* tablespaces. */
} SharedFileSet;
extern void SharedFileSetInit(SharedFileSet *fileset, dsm_segment *seg);
extern void SharedFileSetAttach(SharedFileSet *fileset, dsm_segment *seg);
extern File SharedFileSetCreate(SharedFileSet *fileset, const char *name);
extern File SharedFileSetOpen(SharedFileSet *fileset, const char *name);
extern bool SharedFileSetDelete(SharedFileSet *fileset, const char *name,
bool error_on_failure);
extern void SharedFileSetDeleteAll(SharedFileSet *fileset);
#endif
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