5.2 Issues in multitasking
When you invokequit from the Multitasking Facility, the scheduler first modifies all processes so that only the initial process can run. It sets the special variable*quitting-lisp* tot to prevent new processes from being created and existing processes from being deactivated. The initial process then activates all living processes and kills them by using the functionkill-process.
The functionkill-process causes each process to unwind its stack and run all the pending cleanup forms. Once all the other processes have died, the initial process then unwinds its own stack and informs the operating system to terminate Lisp.
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