5.3 Debugging under multitasking

5.3.4 Breakpoints into the initial I/O stream

When no process is communicating with the stream that is the initial value of the variable*terminal-io*, you can use a keyboard interrupt to turn off the scheduler and to enter a breakpoint into the initial I/O stream; the Debugger is entered at the breakpoint. In Liquid Common Lisp,Ctrl-C issues a keyboard interrupt. You then can use the functioninterrupt-process to specify a process to run when you exit the initial I/O break and restart the scheduler.

The Advanced User's Guide - 9 SEP 1996

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