:PROPERTIES:
:ID:       d0290261-e925-436a-9788-3ed4b0ba71d3
:CREATED:  [2026-03-30 Mon 21:16]
:EDITED:   [2026-04-07 Tue 13:42]
:END:
#+TITLE: CLOSOS: Multiple Simultaneous Environments
#+DATE: 2026-03-22
#+FILETAGS: :architecture:lisp:os:closos:security:

* Concept
CLOSOS supports multiple simultaneous global environments, where an environment is a mapping from names to objects (functions, classes, packages).

* Key Principles
- *Isolation by Scope:* Each user or process can operate in a private environment. Redefining a system function (like `print-object`) in one environment does not affect other users.
- *Dynamic Adaptability:* Facilitates safe experimentation with new features without risking system-wide corruption.
- *Late Binding:* References are resolved against the current environment at compile/load time, enabling live updates and hot-reloading.

* Source
:PROPERTIES:
:ID:       9c69a9ab-1c96-490e-9a8e-fbeafacba30e
:END:
- [[attachment:strandh-lispos.pdf][Robert Strandh, "CLOSOS: Specification of a Lisp operating system" (2013)]]