OutputStream.flushAsync

void flushAsync(int  ioPriority,  gio.cancellable.Cancellable cancellable =  null,  gio.types.AsyncReadyCallback callback =  null)

Forces an asynchronous write of all user-space buffered data for the given stream. For behaviour details see [gio.output_stream.OutputStream.flush].

When the operation is finished callback will be called. You can then call [gio.output_stream.OutputStream.flushFinish] to get the result of the operation.

Parameters

`ioPriority`	the io priority of the request.
`cancellable`	optional #GCancellable object, null to ignore.
`callback`	a #GAsyncReadyCallback to call when the request is satisfied