[PATCH 02/16] Add zeroRecPtr as a shortcut for initializing a local variable to {0, 0}

From: Andres Freund <andres@anarazel.de>

This is locally defined in lots of places and would get introduced frequently
in the next commits. It is expected that this can be defined in a header-only
manner as soon as the XLogInsert scalability groundwork from Heikki gets in.
---src/backend/access/transam/xlogutils.c |    1 +src/include/access/xlogdefs.h          |    1 +2 files changed, 2
insertions(+)

diff --git a/src/backend/access/transam/xlogutils.c b/src/backend/access/transam/xlogutils.c
index 6ddcc59..3a2462b 100644
--- a/src/backend/access/transam/xlogutils.c
+++ b/src/backend/access/transam/xlogutils.c
@@ -51,6 +51,7 @@ typedef struct xl_invalid_pagestatic HTAB *invalid_page_tab = NULL;
+XLogRecPtr zeroRecPtr = {0, 0};/* Report a reference to an invalid page */static void
diff --git a/src/include/access/xlogdefs.h b/src/include/access/xlogdefs.h
index 5e6d7e6..2768427 100644
--- a/src/include/access/xlogdefs.h
+++ b/src/include/access/xlogdefs.h
@@ -35,6 +35,7 @@ typedef struct XLogRecPtr    uint32        xrecoff;        /* byte offset of location in log file */}
XLogRecPtr;
+extern XLogRecPtr zeroRecPtr;#define XLogRecPtrIsInvalid(r)    ((r).xrecoff == 0)
-- 
1.7.10.rc3.3.g19a6c.dirty