27.12.5 Emergency Escape
Because at times there have been bugs causing Emacs to loop without
checking `quit-flag', a special feature causes Emacs to be suspended
immediately if you type a second `C-g' while the flag is already set,
so you can always get out of XEmacs. Normally Emacs recognizes and
clears `quit-flag' (and quits!) quickly enough to prevent this from
When you resume Emacs after a suspension caused by multiple `C-g', it
asks two questions before going back to what it had been doing:
Auto-save? (y or n)
Abort (and dump core)? (y or n)
Answer each one with `y' or `n' followed by <RET>.
Saying `y' to `Auto-save?' causes immediate auto-saving of all
modified buffers in which auto-saving is enabled.
Saying `y' to `Abort (and dump core)?' causes an illegal instruction
to be executed, dumping core. This is to enable a wizard to figure out
why Emacs was failing to quit in the first place. Execution does not
continue after a core dump. If you answer `n', execution does
continue. With luck, Emacs will ultimately check `quit-flag' and quit
normally. If not, and you type another `C-g', it is suspended again.
If Emacs is not really hung, but is just being slow, you may invoke
the double `C-g' feature without really meaning to. In that case,
simply resume and answer `n' to both questions, and you will arrive at
your former state. Presumably the quit you requested will happen soon.
The double-`C-g' feature may be turned off when Emacs is running
under a window system, since the window system always enables you to
kill Emacs or to create another window and run another program.
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