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Split out XLog reading as an independent facility

This new facility can not only be used by xlog.c to carry out crashrecovery, but also by external programs. By supplying a function toread XLog pages from somewhere, all the WAL reading can be used forcompletely different purposes.For the standard backend use, the behavior should be pretty much thesame as previously. As for non-backend programs, an hypotheticalpg_xlogdump program is now closer to reality, but some more backendsupport is still necessary.This patch was originally submitted by Andres Freund in a differentform, but Heikki Linnakangas opted for and authored another design ofthe concept. Andres has advanced the patch since Heikki's initialversion. Review and some (mostly cosmetics) changes by me.

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src
- backend
  - access/transam
  - nls.mk
- include/access
  - xlogreader.h

5 files changed

+1260

-704

lines changed

`‎src/backend/access/transam/Makefile`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -14,7 +14,7 @@ include $(top_builddir)/src/Makefile.global`
`14`	`14`
`15`	`15`	`OBJS = clog.o transam.o varsup.o xact.o rmgr.o slru.o subtrans.o multixact.o\`
`16`	`16`	`timeline.o twophase.o twophase_rmgr.o xlog.o xlogarchive.o xlogfuncs.o\`
`17`		`-xlogutils.o`
	`17`	`+xlogreader.oxlogutils.o`
`18`	`18`
`19`	`19`	`include$(top_srcdir)/src/backend/common.mk`
`20`	`20`

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Commit7fcbf6a

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5 files changed

5 files changed

`‎src/backend/access/transam/Makefile`

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