emacs-nox hogs CPU if backgrounded during compile

[Ryan Johnson]

Hi all,

The following STC causes emacs-nox to peg a CPU indefinitely. Emacs 
remains responsive, but C-c C-k doesn't kill the compile; you have to 
exit emacs to remove the "Compiling" status. Killing the buffer or 
starting a new compile offers to kill the offending process, but doesn't.

Attaching gdb shows an endless loop inside 
kernelbase.dll!RaiseException, but provides no other clues that I could see.

1. emacs-nox -Q
2. M-x compile
3. C-a C-k sleep 1; echo hi
4. ^Z (before the sleep finishes)
5. fg (after the sleep finishes)

I don't know if this is related to limited pipe buffering, but I don't 
think so: it has always worked in the past, and the the 3-4 bytes 
required to buffer up "hi\n" is hardly onerous.

$ uname -a
CYGWIN_NT-6.1 ryan-laptop-v02 1.7.24(0.269/5/3) 2013-08-15 11:59 x86_64 
Cygwin

$ cygcheck -cd
bash                      4.1.11-1
cygwin                    1.7.24-1
emacs                     24.3-5
mintty                    1.2-beta1-1

Ryan

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