eio_cancel

(PECL eio >= 0.0.1dev)

eio_cancel — Cancels a request

Description

eio_cancel(resource $req): void

eio_cancel() cancels a request specified by req

Parameters

req

The request resource

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

No value is returned.

Examples

Example #1 eio_cancel() example

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

/ 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

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