[ANNOUNCEMENT] Updated for 32-bit, new for 64-bit: libsigsegv-2.10-2

Corinna Vinschen corinna-cygwin@cygwin.com
Mon Jul 20 15:18:00 GMT 2015

On Jul 20 09:03, Ken Brown wrote:
> On 7/20/2015 7:20 AM, Corinna Vinschen wrote:
> >On Jul 19 10:37, Corinna Vinschen wrote:
> >>Cygwin shouldn't really consume 16K stack by itself when called from the
> >>application.  Large buffers should use the tmp_pathbuf facility throughout.
> >>
> >>But there are still functions using big stack buffers.  I mention them
> >>here for bookkeeping as much as for information and discussion:
> >>
> >>- Debugging code in dcrt0.cc, initial_env() uses 96K stack on process
> >>   startup.  Usually disabled.  Non-critical.
> >>
> >>- dll_list::alloc, called during DLL initialization uses 64K stack.
> >>   Calling dlopen from the alternate stack would be fatal.  The buffer
> >>   is used in code called under Windows loader lock conditions, so this
> >>   could be converted to a static buffer.
> >>
> >>- A function called error_start_init uses 32K of stack and is called
> >>   if the env var CYGWIN is set to "error_init:...".  That's very unlikely
> >>   from a SEGV handler.  Not nice, but probably non-critical.
> >>
> >>- pinfo::status_exit is called when a process exits due to a signal
> >>   from Windows.  This usually shouldn't happen inside the signal
> >>   handler, but it might.  pinfo::status_exit uses a 32K buffer.
> >>
> >>- Stracing a process ends up using >48K of stack.
> >>
> >>That means even the current 32K are not quite sufficient, though, only
> >>in unlikely border cases, apparently.
> >>
> >>Anyway, I plan to change this in the next few days.  Given this, I'll
> >>set MINSIGSTKSZ to 8K and SIGSTKSZ to 32K in 2.2.
> >
> >I uploaded snapshots as well as a 2.2.0-0.1 test release.  Please
> >give it a try.
> Everything is fine as far as emacs is concerned.  I'll rebuild clisp and
> test it later today.

Great, thanks for testing!


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat
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