/**
* readahead()
* @param integer $length Length
* @param integer $offset Offset
* @param callable $cb Callback
* @param integer $pri Priority
* @return resource|false
*/
public function readahead($length, $offset = null, $cb = null, $pri = EIO_PRI_DEFAULT)
{
$cb = CallbackWrapper::forceWrap($cb);
if (!$this->fd) {
if ($cb) {
$cb($this, false);
}
return false;
}
if (!FileSystem::$supported) {
if ($cb) {
$cb($this, false);
}
return false;
}
$this->offset += $length;
return eio_readahead($this->fd, $length, $offset !== null ? $offset : $this->offset, $pri, $cb, $this);
}
public function readahead($length, $offset = null, $cb = null, $pri = EIO_PRI_DEFAULT)
{
if (!FS::$supported) {
call_user_func($cb, $this, false);
return;
}
$this->offset += $length;
eio_readahead($this->fd, $length, $offset !== null ? $offset : $this->pos, $pri, $cb, $this);
return true;
}
