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XLogReader general code cleanup

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Some minor tweaks and comment additions, for cleanliness sake and to
avoid having the upcoming timeline-following patch be polluted with
unrelated cleanup.

Extracted from a larger patch by Craig Ringer, reviewed by Andres
Freund, with some additions by myself.
This commit is contained in:
Alvaro Herrera
2016-03-30 18:56:13 -03:00
parent 50861cd683
commit 3b02ea4f07
5 changed files with 86 additions and 30 deletions
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17
src/include/access/xlogreader.h
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@@ -139,16 +139,22 @@ struct XLogReaderState
* ----------------------------------------
*/
/* Buffer for currently read page (XLOG_BLCKSZ bytes) */
/*
* Buffer for currently read page (XLOG_BLCKSZ bytes, valid up to at least
* readLen bytes)
*/
char *readBuf;
uint32 readLen;
/* last read segment, segment offset, read length, TLI */
/* last read segment, segment offset, TLI for data currently in readBuf */
XLogSegNo readSegNo;
uint32 readOff;
uint32 readLen;
TimeLineID readPageTLI;
/* beginning of last page read, and its TLI */
/*
* beginning of prior page read, and its TLI. Doesn't necessarily
* correspond to what's in readBuf; used for timeline sanity checks.
*/
XLogRecPtr latestPagePtr;
TimeLineID latestPageTLI;
@@ -174,6 +180,9 @@ extern void XLogReaderFree(XLogReaderState *state);
extern struct XLogRecord *XLogReadRecord(XLogReaderState *state,
XLogRecPtr recptr, char **errormsg);
/* Invalidate read state */
extern void XLogReaderInvalReadState(XLogReaderState *state);
#ifdef FRONTEND
extern XLogRecPtr XLogFindNextRecord(XLogReaderState *state, XLogRecPtr RecPtr);
#endif /* FRONTEND */