diff options
Diffstat (limited to 'storage/innobase/include/buf0rea.h')
| -rw-r--r-- | storage/innobase/include/buf0rea.h | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/storage/innobase/include/buf0rea.h b/storage/innobase/include/buf0rea.h index b4d25e6fde0..093750623d6 100644 --- a/storage/innobase/include/buf0rea.h +++ b/storage/innobase/include/buf0rea.h @@ -33,12 +33,10 @@ Created 11/5/1995 Heikki Tuuri High-level function which reads a page asynchronously from a file to the buffer buf_pool if it is not already there. Sets the io_fix flag and sets an exclusive lock on the buffer frame. The flag is cleared and the x-lock -released by the i/o-handler thread. Does a random read-ahead if it seems -sensible. -@return number of page read requests issued: this can be greater than -1 if read-ahead occurred */ +released by the i/o-handler thread. +@return TRUE if page has been read in, FALSE in case of failure */ UNIV_INTERN -ulint +ibool buf_read_page( /*==========*/ ulint space, /*!< in: space id */ @@ -48,7 +46,7 @@ buf_read_page( Applies linear read-ahead if in the buf_pool the page is a border page of a linear read-ahead area and all the pages in the area have been accessed. Does not read any page if the read-ahead mechanism is not activated. Note -that the the algorithm looks at the 'natural' adjacent successor and +that the algorithm looks at the 'natural' adjacent successor and predecessor of the page, which on the leaf level of a B-tree are the next and previous page in the chain of leaves. To know these, the page specified in (space, offset) must already be present in the buf_pool. Thus, the |