diff options
Diffstat (limited to 'src/include/storage/bufmgr.h')
| -rw-r--r-- | src/include/storage/bufmgr.h | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/src/include/storage/bufmgr.h b/src/include/storage/bufmgr.h index bf3b12a2de3..ee91b8fa26c 100644 --- a/src/include/storage/bufmgr.h +++ b/src/include/storage/bufmgr.h @@ -46,6 +46,15 @@ typedef enum * replay; otherwise same as RBM_NORMAL */ } ReadBufferMode; +/* + * Type returned by PrefetchBuffer(). + */ +typedef struct PrefetchBufferResult +{ + Buffer recent_buffer; /* If valid, a hit (recheck needed!) */ + bool initiated_io; /* If true, a miss resulting in async I/O */ +} PrefetchBufferResult; + /* forward declared, to avoid having to expose buf_internals.h here */ struct WritebackContext; @@ -162,8 +171,11 @@ extern PGDLLIMPORT int32 *LocalRefCount; /* * prototypes for functions in bufmgr.c */ -extern void PrefetchBuffer(Relation reln, ForkNumber forkNum, - BlockNumber blockNum); +extern PrefetchBufferResult PrefetchSharedBuffer(struct SMgrRelationData *smgr_reln, + ForkNumber forkNum, + BlockNumber blockNum); +extern PrefetchBufferResult PrefetchBuffer(Relation reln, ForkNumber forkNum, + BlockNumber blockNum); extern Buffer ReadBuffer(Relation reln, BlockNumber blockNum); extern Buffer ReadBufferExtended(Relation reln, ForkNumber forkNum, BlockNumber blockNum, ReadBufferMode mode, |