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Change Win32 O_SYNC method to O_DSYNC because that is what the method

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currently does.  This is now the default Win32 wal sync method because
we perfer o_datasync to fsync.

Also, change Win32 fsync to a new wal sync method called
fsync_writethrough because that is the behavior of _commit, which is
what is used for fsync on Win32.

Backpatch to 8.0.X.
This commit is contained in:
Bruce Momjian
2005-03-24 04:36:20 +00:00
parent 0275b3f783
commit b1f57d88f5
5 changed files with 26 additions and 9 deletions
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18
src/backend/access/transam/xlog.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.181 2005/02/12 23:53:37 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.182 2005/03/24 04:36:17 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -63,8 +63,13 @@
#endif
#endif
#if defined(O_DSYNC)
#if defined(OPEN_SYNC_FLAG)
#if defined(O_DSYNC) && (O_DSYNC != OPEN_SYNC_FLAG)
#if O_DSYNC != OPEN_SYNC_FLAG
#define OPEN_DATASYNC_FLAG O_DSYNC
#endif
#else /* !defined(OPEN_SYNC_FLAG) */
/* Win32 only has O_DSYNC */
#define OPEN_DATASYNC_FLAG O_DSYNC
#endif
#endif
@ -79,7 +84,11 @@
#define DEFAULT_SYNC_METHOD SYNC_METHOD_FDATASYNC
#define DEFAULT_SYNC_FLAGBIT 0
#else
#ifndef FSYNC_IS_WRITE_THROUGH
#define DEFAULT_SYNC_METHOD_STR "fsync"
#else
#define DEFAULT_SYNC_METHOD_STR "fsync_writethrough"
#endif
#define DEFAULT_SYNC_METHOD SYNC_METHOD_FSYNC
#define DEFAULT_SYNC_FLAGBIT 0
#endif
@ -5154,7 +5163,12 @@ assign_xlog_sync_method(const char *method, bool doit, GucSource source)
int new_sync_method;
int new_sync_bit;
#ifndef FSYNC_IS_WRITE_THROUGH
if (pg_strcasecmp(method, "fsync") == 0)
#else
/* Win32 fsync() == _commit(0, which writes through a write cache */
if (pg_strcasecmp(method, "fsync_writethrough") == 0)
#endif
{
new_sync_method = SYNC_METHOD_FSYNC;
new_sync_bit = 0;