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Date: Thu, 08 Jul 2010 16:48:14 +0100
From: Dave Korn <dave DOT korn DOT cygwin AT gmail DOT com>
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Subject: Re: gcc4: throwing exception from signal handler
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On 08/07/2010 14:01, Don Ward wrote:
> I would like to be able to catch certain signals (SIGSEGV and SIGSYS)
> and throw a C++ exception (to be caught in a try/catch construct).  As a
> simple example:

> Am I misunderstanding how this should work or doing something wrong?  Or
> is this a problem with Cygwin or gcc?

  Throwing exceptions from a signal handler is a can of worms that requires
support from both the compiler and the C runtime.  I was working on adding
this support for the distro package of gcc-4.5 before I had to go AWOL a
couple of weeks ago; it requires building the Cygwin DLL with EH tables, and
adding support in the last-chance stack unwinder in libgcc that is able to
unwind past our sigfe/sigbe stuff.

  I'll be back in the Cygwin/GCC world starting next week.

    cheers,
      DaveK


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