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* DevNotes: Add entry cgf-000020, relating to previous checkin.

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winsup/cygwin/ChangeLog
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2013-01-02 Christopher Faylor <me.cygwin2012@cgf.cx>
2013-01-02 Christopher Faylor <me.cygwin2013@cgf.cx>
* DevNotes: Add entry cgf-000020, relating to previous checkin.
2013-01-02 Christopher Faylor <me.cygwin2013@cgf.cx>
* cygtls.h (_cygtls::signal_exit): Delete from class.
* exception.h (cygwin_exception): New class.

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winsup/cygwin/DevNotes
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2013-01-02 cgf-000020
(This entry should have been checked in with the changes but... I forgot)
This is a fairly big revamp of the way that windows signals are handled.
The intent is that all signal decisions should be made by the signal
thread; not by the exception handler.
This required the ability to pass information from the exception handler
to the signal thread so, a si_cyg field was added to siginfo_t. This
contains information needed to generate a "core dump". Hmm. Haven't
checked to see if this breaks Cygwin's hardly-ever-used real core dump
facility.
Anyway, I moved signal_exit back into exceptions.cc and removed it from
the sigpacket class. This function is now treated like a signal handler
function - Cygwin will cause it to be dispatched in the context of
whatever thread caught the signal. signal_exit also makes the
determination about when to write a stackdump.
The signal-handler thread will no longer ever attempt to exit. It will
just keep processing signals (it will not process real signals after
Cygwin stops shutting down, however). This should make it impossible
for the signal thread to ever block waiting for the process lock since
it now never grabs the process lock. The signal-handler thread will
notify gdb when it gets a signal now but, in theory, gdb should see the
context of the thread which received the signal, not the signal-handler
thread.
2012-12-28 cgf-000019
(I forgot to mention that cgf-000018 was reverted. Although I never saw