eio_readahead

(PECL eio >= 0.0.1dev)

Perform file readahead into page cache

resource eio_readahead ( mixed $fd, int $offset, int $length [, int $pri = EIO_PRI_DEFAULT [, callable $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.

Parameters:

Stream, Socket resource, or numeric 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:

void callback(mixed $data, int $result[, resource $req]);

data

Arbitrary variable passed to callback.

Returns:

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

Links:

http://php.net/manual/en/function.eio-readahead.php

doc_php

2016-02-24 16:04:42

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