src/include/postmaster/bgwriter.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * bgwriter.h
   4  *        Exports from postmaster/bgwriter.c and postmaster/checkpointer.c.
   5  *
   6  * The bgwriter process used to handle checkpointing duties too.  Now
   7  * there is a separate process, but we did not bother to split this header.
   8  *
   9  * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
  10  *
  11  * src/include/postmaster/bgwriter.h
  12  *
  13  *-------------------------------------------------------------------------
  14  */
  15 #ifndef _BGWRITER_H
  16 #define _BGWRITER_H
  17
  18 #include "storage/block.h"
  19 #include "storage/relfilelocator.h"
  20 #include "storage/smgr.h"
  21 #include "storage/sync.h"
  22
  23
  24 /* GUC options */
  25 extern PGDLLIMPORT int BgWriterDelay;
  26 extern PGDLLIMPORT int CheckPointTimeout;
  27 extern PGDLLIMPORT int CheckPointWarning;
  28 extern PGDLLIMPORT double CheckPointCompletionTarget;
  29
  30 extern void BackgroundWriterMain(char *startup_data, size_t startup_data_len) pg_attribute_noreturn();
  31 extern void CheckpointerMain(char *startup_data, size_t startup_data_len) pg_attribute_noreturn();
  32
  33 extern void RequestCheckpoint(int flags);
  34 extern void CheckpointWriteDelay(int flags, double progress);
  35
  36 extern bool ForwardSyncRequest(const FileTag *ftag, SyncRequestType type);
  37
  38 extern void AbsorbSyncRequests(void);
  39
  40 extern Size CheckpointerShmemSize(void);
  41 extern void CheckpointerShmemInit(void);
  42
  43 extern bool FirstCallSinceLastCheckpoint(void);
  44
  45 #endif                                                  /* _BGWRITER_H */