(PECL eio >= 0.0.1dev)
eio_readahead — Perform file readahead into page cache
$pri= EIO_PRI_DEFAULT [, callable
$callback= NULL [, mixed
$data= NULL ]]] )
eio_readahead() populates the page cache with data from a file so that subsequent reads from that file will not block on disk I/O. See READAHEAD(2) man page for details.
Stream, Socket resource, or numeric file descriptor
Starting point from which data is to be read.
Number of bytes to be read.
The request priority:
priinternally is set to
callbackfunction is called when the request is done. It should match the following prototype:
void callback($data, $result);
$datais custom data passed to the request.
$resultcontains request-specific result value; basically, the value returned by corresponding system call.
Arbitrary variable passed to
eio_readahead() returns request resource on success or
FALSE on error.