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

From: Andres Freund <andres(at)anarazel(dot)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_page

static 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)


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1.7.10.rc3.3.g19a6c.dirty