[Ecls-list] Segfault in windows using cl-async

Andrew Lyon orthecreedence at gmail.com
Fri Jun 20 19:15:32 UTC 2014

Right you are, I edited the example. And as you suspected, the issue still
happens =]. Any pointers on where I would start look for something like
adding :stdcall convention support to the compiler/CFFI? Thanks!


On Fri, Jun 20, 2014 at 11:50 AM, Matthew Mondor <mm_lists at pulsar-zone.net>

> On Fri, 20 Jun 2014 11:19:00 -0700
> Andrew Lyon <orthecreedence at gmail.com> wrote:
> > Hello all. I'm the author of cl-async (
> > https://github.com/orthecreedence/cl-async) and I'm getting segfaults
> when
> > using it in Windows with ECL (Windows 7 x64, ECL git (52bbd351500),
> libffi
> > 3.0.11, libevent 2.0.21, all compiled via 32bit MinGW gcc 4.8.1. I'm
> using
> > ECL's c compiler for everything (same mingw).
> >
> > Everything compiles and runs fine, until I do anything with socket IO,
> then
> > I get a segfault.
> > See https://gist.github.com/orthecreedence/a2b666419fe220bfae31
> (backtrace
> > in comments)
> This is probably irrelevant to the issue you're experiencing (please
> disreguard if you intended to compile as a test, but not to use the
> compiled versions in the above):
> I'm not sure that the COMPILE calls do what you intend there...  From
> the HyperSpec:
> "If the name is nil, the resulting compiled function is returned
> directly as the primary value. If a non-nil name is given, then the
> resulting compiled function replaces the existing function definition
> of name and the name is returned as the primary value; if name is a
> symbol that names a macro, its macro function is updated and the name
> is returned as the primary value."
> So the functions would be compiled but reference to the compiled
> versions discarded unless you used funcall on the return value or
> assigned it yourself using (setf (symbol-function <symbol>)), which
> would be the same as using (compile 'delay) for instance.
> > I believe this *may* be related to a bug I reported a while back (
> > https://sourceforge.net/p/ecls/bugs/204/) because the backtrace on the
> > segfault is completely empty (like in the bug). However it's off that
> some
> > callbacks work and others don't because they all make use of arguments.
> My experience with ECL or CFFI on Windows are NIL, unfortunately.
> > Instead of just whining and hoping someone fixes it, I'd like to jump in
> > and give it a shot myself (unless it's a quick fix that someone can make
> > easily). I've been meaning to get to know ECL better because I'm trying
> to
> > use it for a largish project and I think knowing the internals better
> would
> > help me out. I'd also like to eventually get to the point where I can
> help
> > out with various contributions when I have time. I'm ok with C but have
> > never touched a compiler before, so any sort of guidance I can get on
> > solving this issue would be great.
> This list is for that, among other things, you're welcome to ask
> questions and we'll help as we can.  Contributions to ECL (and to
> ECL-specific CFFI backend) are also welcome.
> --
> Matt
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