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Support syncing WAL log to disk using either fsync(), fdatasync(),

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O_SYNC, or O_DSYNC (as available on a given platform).  Add GUC parameter
to control sync method.
Also, add defense to XLogWrite to prevent it from going nuts if passed
a target write position that's past the end of the buffers so far filled
by XLogInsert.
This commit is contained in:
Tom Lane
2001-03-16 05:44:33 +00:00
parent 4eb5e27a28
commit 9d645fd84c
6 changed files with 287 additions and 62 deletions
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14
src/include/access/xlog.h
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@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: xlog.h,v 1.20 2001/03/13 20:32:37 tgl Exp $
* $Id: xlog.h,v 1.21 2001/03/16 05:44:33 tgl Exp $
*/
#ifndef XLOG_H
#define XLOG_H
@@ -176,6 +176,15 @@ extern StartUpID ThisStartUpID; /* current SUI */
extern bool InRecovery;
extern XLogRecPtr MyLastRecPtr;
/* these variables are GUC parameters related to XLOG */
extern int CheckPointSegments;
extern int XLOGbuffers;
extern int XLOGfiles;
extern int XLOG_DEBUG;
extern char *XLOG_sync_method;
extern const char XLOG_sync_method_default[];
extern XLogRecPtr XLogInsert(RmgrId rmid, uint8 info, XLogRecData *rdata);
extern void XLogFlush(XLogRecPtr RecPtr);
@@ -202,4 +211,7 @@ extern void GetRedoRecPtr(void);
*/
extern XLogRecPtr GetUndoRecPtr(void);
extern bool check_xlog_sync_method(const char *method);
extern void assign_xlog_sync_method(const char *method);
#endif /* XLOG_H */