## 例

`

     resource eio_readahead ( int $fd , int $offset , int $length [, int $pri = EIO_PRI_DEFAULT [, mixed $callback = NULL [, mixed $data = NULL ]]] )

`

## 説明

eio_readahead() populates the page cache with data from a file so that subsequent reads from that file will not block on disk I/O. See READAHEAD(2) man page for details.

## 戻り値

eio_readahead() returns request resource on success or FALSE on error.