set_async
Description:
Set PKCS#11 attributes on an object.
This call will return immediately and completes asynchronously.
Parameters:
| this |
The object to set attributes on. |
| attrs |
The attributes to set on the object. |
| cancellable |
Optional cancellable object, or null to ignore. |
| callback |
Callback which is called when operation completes. |
| user_data |
Data to pass to the callback. |