diff options
Diffstat (limited to 'src/backend/access/transam/xlogutils.c')
| -rw-r--r-- | src/backend/access/transam/xlogutils.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/backend/access/transam/xlogutils.c b/src/backend/access/transam/xlogutils.c index bb2d3ec991c..b5d34c61e66 100644 --- a/src/backend/access/transam/xlogutils.c +++ b/src/backend/access/transam/xlogutils.c @@ -80,6 +80,10 @@ typedef struct xl_invalid_page static HTAB *invalid_page_tab = NULL; +static int +read_local_xlog_page_guts(XLogReaderState *state, XLogRecPtr targetPagePtr, + int reqLen, XLogRecPtr targetRecPtr, + char *cur_page, bool wait_for_wal); /* Report a reference to an invalid page */ static void @@ -871,6 +875,31 @@ int read_local_xlog_page(XLogReaderState *state, XLogRecPtr targetPagePtr, int reqLen, XLogRecPtr targetRecPtr, char *cur_page) { + return read_local_xlog_page_guts(state, targetPagePtr, reqLen, + targetRecPtr, cur_page, true); +} + +/* + * Same as read_local_xlog_page except that it doesn't wait for future WAL + * to be available. + */ +int +read_local_xlog_page_no_wait(XLogReaderState *state, XLogRecPtr targetPagePtr, + int reqLen, XLogRecPtr targetRecPtr, + char *cur_page) +{ + return read_local_xlog_page_guts(state, targetPagePtr, reqLen, + targetRecPtr, cur_page, false); +} + +/* + * Implementation of read_local_xlog_page and its no wait version. + */ +static int +read_local_xlog_page_guts(XLogReaderState *state, XLogRecPtr targetPagePtr, + int reqLen, XLogRecPtr targetRecPtr, + char *cur_page, bool wait_for_wal) +{ XLogRecPtr read_upto, loc; TimeLineID tli; @@ -925,6 +954,10 @@ read_local_xlog_page(XLogReaderState *state, XLogRecPtr targetPagePtr, if (loc <= read_upto) break; + /* If asked, let's not wait for future WAL. */ + if (!wait_for_wal) + break; + CHECK_FOR_INTERRUPTS(); pg_usleep(1000L); } |