(PECL eio >= 0.0.1dev)
eio_readahead — Perform file readahead into page cache
$fd,$offset,$length,$pri = EIO_PRI_DEFAULT,$callback = NULL,$data = NULL
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.
fdStream, Socket resource, or numeric file descriptor
offsetStarting point from which data is to be read.
lengthNumber of bytes to be read.
priThe request priority: EIO_PRI_DEFAULT, EIO_PRI_MIN, EIO_PRI_MAX, or null.
If null passed, pri internally is set to
EIO_PRI_DEFAULT.
callback
callback function is called when the request is done.
It should match the following prototype:
void callback(mixed $data, int $result[, resource $req]);datais custom data passed to the request.
resultrequest-specific result value; basically, the value returned by corresponding system call.
reqis optional request resource which can be used with functions like eio_get_last_error().
data
Arbitrary variable passed to callback.
eio_readahead() returns request resource on success, başarısızlık durumunda false döner.