php man page for eio_cancel

EIO_CANCEL(3)								 1							     EIO_CANCEL(3)

eio_cancel - Cancels a request

SYNOPSIS
       void eio_cancel (resource  $req)

DESCRIPTION
       eio_cancel(3) cancels a request specified by $req

PARAMETERS
	      o $req
		- The request resource

	      o $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.

	      o $callback
		-$callback function is called when the request is done. It should match the following prototype:

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

		     o $data
		       -is custom data passed to the request.

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

		     o $req
		       -is optional request resource which can be used with functions like eio_get_last_error(3)

	      o $data
		- Arbitrary variable passed to $callback.

RETURN VALUES
	No value is returned.

EXAMPLES
       Example #1

	      eio_cancel(3) example

	      <?php
	       /* Is called when eio_nop() finished */
	       function my_nop_cb($data, $result) {
		echo "my_nop ", $data, "
";
	       }

	      // This eio_nop() call will be cancelled
	      $req = eio_nop(EIO_PRI_DEFAULT, "my_nop_cb", "1");
	      var_dump($req);
	      eio_cancel($req);

	      // This time eio_nop() will be processed
	      eio_nop(EIO_PRI_DEFAULT, "my_nop_cb", "2");

	      // Process requests
	      eio_event_loop();
	      ?>

	      The above example will output something similar to:

	      resource(4) of type (EIO Request Descriptor)
	      my_nop 2

SEE ALSO eio_grp_cancel.
PHP Documentation Group 													     EIO_CANCEL(3)