Starts an asynchronous eject on a mountable.
When this operation has completed, callback will be called with
user_user data, and the operation can be finalized with
g_file_eject_mountable_with_operation_finish().
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 G_IO_ERROR_CANCELLED will be returned.
Starts an asynchronous eject on a mountable. When this operation has completed, callback will be called with user_user data, and the operation can be finalized with g_file_eject_mountable_with_operation_finish().
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 G_IO_ERROR_CANCELLED will be returned.