eio_readeio_readahead
(PECL eio >= 0.0.1dev)
eio_readahead — Perform file readahead into page cache
Descrição
resource eio_readahead
( int $fd
, int $offset
, int $length
[, int $pri = EIO_PRI_DEFAULT
[, callback $callback = NULL
[, mixed $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.
Parâmetros
- fd
-
The file descriptor
- offset
-
Starting point from which data is to be read.
- length
-
Number of bytes to be read.
- pri
-
The 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:
$data is custom data passed to the request. $result contains request-specific result value; basically, the value returned by corresponding system call.void callback($data, $result); - data
-
Arbitrary variable passed to callback.
Valor Retornado
eio_readahead() returns request resource on success or FALSE on error.
User Contributed Notes
eio_readahead
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