diff options
Diffstat (limited to 'src/include/storage/bufmgr.h')
| -rw-r--r-- | src/include/storage/bufmgr.h | 36 |
1 files changed, 0 insertions, 36 deletions
diff --git a/src/include/storage/bufmgr.h b/src/include/storage/bufmgr.h index b379c76e273..d89021f9187 100644 --- a/src/include/storage/bufmgr.h +++ b/src/include/storage/bufmgr.h @@ -250,8 +250,6 @@ extern void AbortBufferIO(Buffer buffer); extern bool BgBufferSync(struct WritebackContext *wb_context); -extern void TestForOldSnapshot_impl(Snapshot snapshot, Relation relation); - /* in buf_init.c */ extern void InitBufferPool(void); extern Size BufferShmemSize(void); @@ -347,9 +345,6 @@ BufferGetPageSize(Buffer buffer) /* * BufferGetPage * Returns the page associated with a buffer. - * - * When this is called as part of a scan, there may be a need for a nearby - * call to TestForOldSnapshot(). See the definition of that for details. */ static inline Page BufferGetPage(Buffer buffer) @@ -357,37 +352,6 @@ BufferGetPage(Buffer buffer) return (Page) BufferGetBlock(buffer); } -/* - * Check whether the given snapshot is too old to have safely read the given - * page from the given table. If so, throw a "snapshot too old" error. - * - * This test generally needs to be performed after every BufferGetPage() call - * that is executed as part of a scan. It is not needed for calls made for - * modifying the page (for example, to position to the right place to insert a - * new index tuple or for vacuuming). It may also be omitted where calls to - * lower-level functions will have already performed the test. - * - * Note that a NULL snapshot argument is allowed and causes a fast return - * without error; this is to support call sites which can be called from - * either scans or index modification areas. - * - * For best performance, keep the tests that are fastest and/or most likely to - * exclude a page from old snapshot testing near the front. - */ -static inline void -TestForOldSnapshot(Snapshot snapshot, Relation relation, Page page) -{ - Assert(relation != NULL); - - if (old_snapshot_threshold >= 0 - && (snapshot) != NULL - && ((snapshot)->snapshot_type == SNAPSHOT_MVCC - || (snapshot)->snapshot_type == SNAPSHOT_TOAST) - && !XLogRecPtrIsInvalid((snapshot)->lsn) - && PageGetLSN(page) > (snapshot)->lsn) - TestForOldSnapshot_impl(snapshot, relation); -} - #endif /* FRONTEND */ #endif /* BUFMGR_H */ |