eio_readahead

    (PECL eio >= 0.0.1dev)

    eio_readahead — Perform file readahead into page cache

    Description

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

    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

    fd

    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

    is custom data passed to the request.

    result

    request-specific result value; basically, the value returned by corresponding system call.

    req

    is optional request resource which can be used with functions like eio_get_last_error().

    data

    Arbitrary variable passed to callback.

    Return Values

    eio_readahead() returns request resource on success, or false on failure.

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