greenplumn buffile 源码
greenplumn buffile 代码
文件路径：/src/include/storage/buffile.h
/*-------------------------------------------------------------------------
*
* buffile.h
* Management of large buffered temporary files.
*
* The BufFile routines provide a partial replacement for stdio atop
* virtual file descriptors managed by fd.c. Currently they only support
* buffered access to a virtual file, without any of stdio's formatting
* features. That's enough for immediate needs, but the set of facilities
* could be expanded if necessary.
*
* BufFile also supports working with temporary files that exceed the OS
* file size limit and/or the largest offset representable in an int.
* It might be better to split that out as a separately accessible module,
* but currently we have no need for oversize temp files without buffered
* access.
*
* Portions Copyright (c) 2007-2008, Greenplum inc
* Portions Copyright (c) 2012-Present VMware, Inc. or its affiliates.
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/storage/buffile.h
*
*-------------------------------------------------------------------------
*/
#ifndef BUFFILE_H
#define BUFFILE_H
#include "storage/sharedfileset.h"
#include "utils/workfile_mgr.h"
/* BufFile is an opaque type whose details are not known outside buffile.c. */
typedef struct BufFile BufFile;
struct workfile_set;
/*
* prototypes for functions in buffile.c
*/
extern BufFile *BufFileCreateTemp(char *operation_name, bool interXact);
extern BufFile *BufFileCreateTempInSet(char *operation_name, bool interXact, struct workfile_set *work_set);
extern void BufFileClose(BufFile *file);
extern size_t BufFileRead(BufFile *file, void *ptr, size_t size);
extern size_t BufFileWrite(BufFile *file, void *ptr, size_t size);
extern int BufFileSeek(BufFile *file, int fileno, off_t offset, int whence);
extern void BufFileTell(BufFile *file, int *fileno, off_t *offset);
extern int BufFileSeekBlock(BufFile *file, int64 blknum);
extern int64 BufFileSize(BufFile *file);
extern int64 BufFileGetSize(BufFile *file);
extern long BufFileAppend(BufFile *target, BufFile *source);
extern BufFile *BufFileCreateShared(SharedFileSet *fileset, const char *name, struct workfile_set *work_set);
extern void BufFileExportShared(BufFile *file);
extern BufFile *BufFileOpenShared(SharedFileSet *fileset, const char *name);
extern void BufFileDeleteShared(SharedFileSet *fileset, const char *name);
extern void *BufFileReadFromBuffer(BufFile *file, size_t size);
extern const char *BufFileGetFilename(BufFile *buffile);
extern void BufFileSuspend(BufFile *buffile);
extern void BufFileResume(BufFile *buffile);
extern bool gp_workfile_compression;
extern void BufFilePledgeSequential(BufFile *buffile);
extern void BufFileSetIsTempFile(BufFile *file, bool isTempFile);
#endif /* BUFFILE_H */
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