Requests an asynchronous close of the stream, releasing resources related to it.
When the operation is finished callback will be called. You can then call close_async.end
to get the result of the operation.
For behaviour details see close.
The asynchronous methods have a default fallback that uses threads to implement asynchronicity, so they are optional for inheriting classes. However, if you override one you must override all.
| this |
a IOStream |
| io_priority |
the io priority of the request |
| cancellable |
optional cancellable object |
| callback |
callback to call when the request is satisfied |
| user_data |
the data to pass to callback function |