I think apache httpd works like this, and there the 2 subjects are mixed. They have a per-request arena. As it gets destroyed at the end of the request, you c

I think apache httpd works like this, and there the 2 subjects are mixed. They have a per-request arena. As it gets destroyed at the end of the request, you can just use a bump allocater which is one of the fastest ways to alloc memory.