(PECL eio >= 0.0.1dev)
eio_readahead — Perform file readahead into page cache
$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.
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:
pri internally is set to
callback function is called when the request is done.
It should match the following prototype:
void callback(mixed $data, int $result[, resource $req]);
is custom data passed to the request.
request-specific result value; basically, the value returned by corresponding system call.
is optional request resource which can be used with functions like eio_get_last_error()
Arbitrary variable passed to
eio_readahead() returns request resource on success or
FALSE on error.