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9.1 Eval Servers

Hemlock runs in the editor process and interacts with other Lisp processes called eval servers. A user’s Lisp program normally runs in an eval server process. The separation between editor and eval server has several advantages:

• The editor is protected from any bad things which may happen while debugging a Lisp program.
• Editing may occur while running a Lisp program.
• The eval server may be on a different machine, removing the load from the editing machine.
• Multiple eval servers allow the use of several distinct Lisp environments.

Instead of providing an interface to a single Lisp environment, Hemlock coordinates multiple Lisp environments.

• The Current Eval Server
• Slaves
• Slave Creation and Destruction
• Eval Server Operations