greenplumn bgwriter 源码
greenplumn bgwriter 代码
文件路径：/src/include/postmaster/bgwriter.h
/*-------------------------------------------------------------------------
*
* bgwriter.h
* Exports from postmaster/bgwriter.c and postmaster/checkpointer.c.
*
* The bgwriter process used to handle checkpointing duties too. Now
* there is a separate process, but we did not bother to split this header.
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
*
* src/include/postmaster/bgwriter.h
*
*-------------------------------------------------------------------------
*/
#ifndef _BGWRITER_H
#define _BGWRITER_H
#include "storage/block.h"
#include "storage/relfilenode.h"
#include "storage/smgr.h"
#include "storage/sync.h"
/* GUC options */
extern int BgWriterDelay;
extern int CheckPointTimeout;
extern int CheckPointWarning;
extern double CheckPointCompletionTarget;
extern void BackgroundWriterMain(void) pg_attribute_noreturn();
extern void CheckpointerMain(void) pg_attribute_noreturn();
extern void RequestCheckpoint(int flags);
extern void CheckpointWriteDelay(int flags, double progress);
extern bool ForwardSyncRequest(const FileTag *ftag, SyncRequestType type);
extern void AbsorbSyncRequests(void);
extern Size CheckpointerShmemSize(void);
extern void CheckpointerShmemInit(void);
extern bool FirstCallSinceLastCheckpoint(void);
#endif /* _BGWRITER_H */
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