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📁 ..
📄 amapi.h(6.3 KB)
📄 amvalidate.h(1.19 KB)
📄 attnum.h(1.52 KB)
📄 brin.h(948 B)
📄 brin_internal.h(3.3 KB)
📄 brin_page.h(2.68 KB)
📄 brin_pageops.h(1.28 KB)
📄 brin_revmap.h(1.23 KB)
📄 brin_tuple.h(3.05 KB)
📄 brin_xlog.h(3.28 KB)
📄 clog.h(1.54 KB)
📄 commit_ts.h(2.09 KB)
📄 genam.h(7.31 KB)
📄 generic_xlog.h(1.42 KB)
📄 gin.h(2.3 KB)
📄 gin_private.h(33.12 KB)
📄 gist.h(6.51 KB)
📄 gist_private.h(19.82 KB)
📄 gistscan.h(729 B)
📄 hash.h(13.54 KB)
📄 heapam.h(7.76 KB)
📄 heapam_xlog.h(12.61 KB)
📄 hio.h(1.26 KB)
📄 htup.h(3.16 KB)
📄 htup_details.h(28.31 KB)
📄 itup.h(4.36 KB)
📄 multixact.h(5.13 KB)
📄 nbtree.h(30.22 KB)
📄 parallel.h(2.28 KB)
📄 printtup.h(1.03 KB)
📄 reloptions.h(8.88 KB)
📄 relscan.h(5.63 KB)
📄 rewriteheap.h(1.79 KB)
📄 rmgr.h(609 B)
📄 rmgrlist.h(2.97 KB)
📄 sdir.h(1.43 KB)
📄 skey.h(6.26 KB)
📄 slru.h(5.49 KB)
📄 spgist.h(7.04 KB)
📄 spgist_private.h(21.82 KB)
📄 stratnum.h(2.67 KB)
📄 subtrans.h(973 B)
📄 sysattr.h(890 B)
📄 timeline.h(1.59 KB)
📄 transam.h(6.29 KB)
📄 tsmapi.h(2.55 KB)
📄 tupconvert.h(1.4 KB)
📄 tupdesc.h(4.36 KB)
📄 tupmacs.h(7.16 KB)
📄 tuptoaster.h(7.18 KB)
📄 twophase.h(1.82 KB)
📄 twophase_rmgr.h(1.24 KB)
📄 valid.h(1.4 KB)
📄 visibilitymap.h(1.77 KB)
📄 xact.h(12.29 KB)
📄 xlog.h(10.91 KB)
📄 xlog_fn.h(1.41 KB)
📄 xlog_internal.h(10.29 KB)
📄 xlogdefs.h(3.11 KB)
📄 xloginsert.h(2.28 KB)
📄 xlogreader.h(7.11 KB)
📄 xlogrecord.h(7.76 KB)
📄 xlogutils.h(1.76 KB)

Editing: xlogdefs.h

/*
 * xlogdefs.h
 *
 * Postgres transaction log manager record pointer and
 * timeline number definitions
 *
 * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/access/xlogdefs.h
 */
#ifndef XLOG_DEFS_H
#define XLOG_DEFS_H

#include <fcntl.h>				/* need open() flags */

/*
 * Pointer to a location in the XLOG.  These pointers are 64 bits wide,
 * because we don't want them ever to overflow.
 */
typedef uint64 XLogRecPtr;

/*
 * Zero is used indicate an invalid pointer. Bootstrap skips the first possible
 * WAL segment, initializing the first WAL page at XLOG_SEG_SIZE, so no XLOG
 * record can begin at zero.
 */
#define InvalidXLogRecPtr	0
#define XLogRecPtrIsInvalid(r)	((r) == InvalidXLogRecPtr)

/*
 * XLogSegNo - physical log file sequence number.
 */
typedef uint64 XLogSegNo;

/*
 * TimeLineID (TLI) - identifies different database histories to prevent
 * confusion after restoring a prior state of a database installation.
 * TLI does not change in a normal stop/restart of the database (including
 * crash-and-recover cases); but we must assign a new TLI after doing
 * a recovery to a prior state, a/k/a point-in-time recovery.  This makes
 * the new WAL logfile sequence we generate distinguishable from the
 * sequence that was generated in the previous incarnation.
 */
typedef uint32 TimeLineID;

/*
 * Replication origin id - this is located in this file to avoid having to
 * include origin.h in a bunch of xlog related places.
 */
typedef uint16 RepOriginId;

/*
 *	Because O_DIRECT bypasses the kernel buffers, and because we never
 *	read those buffers except during crash recovery or if wal_level != minimal,
 *	it is a win to use it in all cases where we sync on each write().  We could
 *	allow O_DIRECT with fsync(), but it is unclear if fsync() could process
 *	writes not buffered in the kernel.  Also, O_DIRECT is never enough to force
 *	data to the drives, it merely tries to bypass the kernel cache, so we still
 *	need O_SYNC/O_DSYNC.
 */
#ifdef O_DIRECT
#define PG_O_DIRECT				O_DIRECT
#else
#define PG_O_DIRECT				0
#endif

/*
 * This chunk of hackery attempts to determine which file sync methods
 * are available on the current platform, and to choose an appropriate
 * default method.  We assume that fsync() is always available, and that
 * configure determined whether fdatasync() is.
 */
#if defined(O_SYNC)
#define OPEN_SYNC_FLAG		O_SYNC
#elif defined(O_FSYNC)
#define OPEN_SYNC_FLAG		O_FSYNC
#endif

#if defined(O_DSYNC)
#if defined(OPEN_SYNC_FLAG)
/* O_DSYNC is distinct? */
#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

#if defined(PLATFORM_DEFAULT_SYNC_METHOD)
#define DEFAULT_SYNC_METHOD		PLATFORM_DEFAULT_SYNC_METHOD
#elif defined(OPEN_DATASYNC_FLAG)
#define DEFAULT_SYNC_METHOD		SYNC_METHOD_OPEN_DSYNC
#elif defined(HAVE_FDATASYNC)
#define DEFAULT_SYNC_METHOD		SYNC_METHOD_FDATASYNC
#else
#define DEFAULT_SYNC_METHOD		SYNC_METHOD_FSYNC
#endif

#endif   /* XLOG_DEFS_H */

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Editing: xlogdefs.h

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