If cancellable is not null, then the operation can be cancelled by
triggering the cancellable object from another thread. If the operation
was cancelled, the error gio.types.IOErrorEnum.Cancelled will be returned.
When the operation is finished, callback will be called.
You can then call gio.file.File.mountMountableFinish to get
the result of the operation.
Polls a file of type gio.types.FileType.Mountable.
If cancellable is not null, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error gio.types.IOErrorEnum.Cancelled will be returned.
When the operation is finished, callback will be called. You can then call gio.file.File.mountMountableFinish to get the result of the operation.