How to make reload (SIGHUP) wait for worker readiness before shutting down old ones?

[salty-horse]

I have a Django project takes a while to load and become ready to handle requests.

When running it with gunicorn (either sync or gevent workers, with preload_app = False), it spawns the new workers, and immediately shuts down the old ones, even before the new workers have a chance to finish loading.

Is there a way to tell gunicorn to wait until the worker is ready? I thought that's what post_worker_init is for, but the old workers are shut down before wait for it to complete.