I've decided to not be lazy and do a little spelunking into CER's - it's rather interesting stuff. I found a pretty good article here: http://msdn.microsoft.com/en-us/magazine/cc163716.aspx
In laymen's terms, it looks like CER's provide reliability where asynchronous exceptions may be thrown: OutOfMemoryException, StackOverflowException, and ThreadAbortException. In the case of MemoryHolder, this is important because such exceptions could preempt the storage of IntPtrs corresponding to allocated memory and/or the deallocation of memory within finalizers - both resulting in memory leaks. As I imagined, this will be something we'll want to incorporate in our FFI impl. <http://msdn.microsoft.com/en-us/magazine/cc163716.aspx>-Charles On Sun, Oct 3, 2010 at 11:51 PM, Ryan Riley <ryan.ri...@panesofglass.org>wrote: > I've not heard of any of those. I started looking at ctypes but never got > far. > > Sent from my iPhone > > On Oct 3, 2010, at 9:27 PM, Charles Strahan <charles.c.stra...@gmail.com> > wrote: > > I'm also taking a look at IronPython's CTypes implementation, under Tomas' > advice. I've noticed that their > MemoryHolder<http://github.com/ironruby/ironruby/blob/master/Languages/IronPython/IronPython.Modules/_ctypes/MemoryHolder.cs>class > derives from > CriticalFinalizerObject<http://msdn.microsoft.com/en-us/library/system.runtime.constrainedexecution.criticalfinalizerobject.aspx>, > which led me to the discovery of Constrained Execution > Regions<http://msdn.microsoft.com/en-us/library/ms228973.aspx> > . > > I sent an inquiry to the IronPython mailing > list<http://lists.ironpython.com/pipermail/users-ironpython.com/2010-October/013757.html>regarding > the use CFO, and about CER in general, as I haven't had any > exposure to either, and the MSDN docs are a little daunting. If anyone here > would like to give an explanation of either one, that would be awesome. > > Any experience with either of those, Ryan? > > -Charles > > > On Sun, Oct 3, 2010 at 10:39 PM, Ryan Riley <<ryan.ri...@panesofglass.org> > ryan.ri...@panesofglass.org> wrote: > >> Sounds good to me! >> >> Sent from my iPhone >> >> On Oct 3, 2010, at 8:04 PM, Charles Strahan <<charles.c.stra...@gmail.com> >> charles.c.stra...@gmail.com> wrote: >> >> Ryan, >> >> Sorry for the long delay - I meant to give it some thought before I got >> back to you... and know it's been quite some time. >> >> I think it would be a good idea to replicate JFFI, using P/Invoke >> directly, if possible (as opposed to P/Invoking >> libffi<http://www.cygwin.org/libffi/>). >> That would give us a good separation of concerns and a reusable library, and >> possibly an easy way to port any Java/JRuby code that uses JFFI to C#/.NET >> too. >> >> I'm about to set up an NFFI repo at >> <http://github.com/cstrahan/nffi><http://github.com/cstrahan/nffi> >> http://github.com/cstrahan/nffi. - I suppose you could fork it and send >> me pull requests (unless you have a better workflow in mind - >> I'm definitely not a git guru). I've been learning C/C++ the last couple >> months, so I should be able to write simple DLL to run our tests against. I >> think I'll take a TDD approach to driving out the C# lib. Once we have NFFI >> working, it should be relatively straightforward to expose that to the >> IronRuby runtime. I'll try to get something pushed out to my repo by the end >> of tomorrow - I'll keep you in the loop. >> >> That's what I have in mind, but I'm open to suggestions. >> >> -Charles >> >> >> >> On Sat, Aug 21, 2010 at 9:23 PM, Ryan Riley >> <<ryan.ri...@panesofglass.org><ryan.ri...@panesofglass.org> >> ryan.ri...@panesofglass.org> wrote: >> >>> Charles, I'm happy to work with you to get this done. I'm getting close >>> to finishing some projects and will have more time to work on it in a few >>> weeks. I will send the info I got from the mono-devel list. Where/how do you >>> want to start? >>> >>> Ryan >>> >>> Sent from my iPhone >>> >>> On Aug 20, 2010, at 1:49 PM, Charles Strahan >>> <<charles.c.stra...@gmail.com><charles.c.stra...@gmail.com> >>> charles.c.stra...@gmail.com> wrote: >>> >>> Ryan, >>> >>> I'm right there with you, only I looked at JFFI for inspiration (didn't >>> know mono had anything - could you share more about that?). In fact, In my >>> infinite laziness, I posted a job for a couple hundred bucks on >>> Rent-A-Coder, hoping someone could essentially port JFFI to C#, so I could >>> focus on writing the actually IronRuby library... but nothing came of that. >>> >>> I'm tempted to suck it up and start coding this myself. Would you be >>> interested in working together? I figured I'd take the approach of >>> essentially writing "NFFI", and then write an IronRuby lib around that. >>> >>> -Charles >>> >>> >>> On Fri, Aug 20, 2010 at 2:33 PM, Ryan Riley >>> <<ryan.ri...@panesofglass.org><ryan.ri...@panesofglass.org><ryan.ri...@panesofglass.org> >>> ryan.ri...@panesofglass.org> wrote: >>> >>>> I know that we've discussed this in the past, but I'm interested in >>>> doing it for two reasons: >>>> 1. We use mono with a bridge to ObjectiveC and Cocoa, and we'd like to >>>> investigate libffi via mono as a potential replacement for our current >>>> bridge. >>>> 2. I'm interested just for the sake of learning more about FFI. >>>> >>>> Mono appears to have had a libffi implementation that was later removed, >>>> so I think I have a place to start. However, I'm not sure that's the right >>>> starting point. Does anyone have a suggestion for how to get started? I've >>>> been taking a look at libffi and DllImport, but I'm not sure if those are >>>> the right directions, something else, or what. >>>> >>>> Thanks, >>>> >>>> Ryan Riley >>>> >>>> Email: <ryan.ri...@panesofglass.org> >>>> <ryan.ri...@panesofglass.org><ryan.ri...@panesofglass.org> >>>> ryan.ri...@panesofglass.org >>>> LinkedIn: >>>> <http://www.linkedin.com/in/ryanriley><http://www.linkedin.com/in/ryanriley><http://www.linkedin.com/in/ryanriley> >>>> http://www.linkedin.com/in/ryanriley >>>> Twitter: @panesofglass >>>> Blog: <http://wizardsofsmart.net/> >>>> <http://wizardsofsmart.net/><http://wizardsofsmart.net/> >>>> http://wizardsofsmart.net/ >>>> Website: <http://panesofglass.org/> >>>> <http://panesofglass.org/><http://panesofglass.org/> >>>> http://panesofglass.org/ >>>> >>>> _______________________________________________ >>>> Ironruby-core mailing list >>>> <Ironruby-core@rubyforge.org> >>>> <Ironruby-core@rubyforge.org><Ironruby-core@rubyforge.org> >>>> Ironruby-core@rubyforge.org >>>> >>>> <http://rubyforge.org/mailman/listinfo/ironruby-core><http://rubyforge.org/mailman/listinfo/ironruby-core><http://rubyforge.org/mailman/listinfo/ironruby-core> >>>> http://rubyforge.org/mailman/listinfo/ironruby-core >>>> >>>> >>> _______________________________________________ >>> Ironruby-core mailing list >>> <Ironruby-core@rubyforge.org> <Ironruby-core@rubyforge.org> >>> Ironruby-core@rubyforge.org >>> >>> <http://rubyforge.org/mailman/listinfo/ironruby-core><http://rubyforge.org/mailman/listinfo/ironruby-core> >>> http://rubyforge.org/mailman/listinfo/ironruby-core >>> >>> >>> _______________________________________________ >>> Ironruby-core mailing list >>> <Ironruby-core@rubyforge.org> <Ironruby-core@rubyforge.org> >>> Ironruby-core@rubyforge.org >>> >>> <http://rubyforge.org/mailman/listinfo/ironruby-core><http://rubyforge.org/mailman/listinfo/ironruby-core> >>> http://rubyforge.org/mailman/listinfo/ironruby-core >>> >>> >> _______________________________________________ >> Ironruby-core mailing list >> <Ironruby-core@rubyforge.org>Ironruby-core@rubyforge.org >> <http://rubyforge.org/mailman/listinfo/ironruby-core> >> http://rubyforge.org/mailman/listinfo/ironruby-core >> >> >> _______________________________________________ >> Ironruby-core mailing list >> <Ironruby-core@rubyforge.org>Ironruby-core@rubyforge.org >> <http://rubyforge.org/mailman/listinfo/ironruby-core> >> http://rubyforge.org/mailman/listinfo/ironruby-core >> >> > _______________________________________________ > Ironruby-core mailing list > Ironruby-core@rubyforge.org > http://rubyforge.org/mailman/listinfo/ironruby-core > > > _______________________________________________ > Ironruby-core mailing list > Ironruby-core@rubyforge.org > http://rubyforge.org/mailman/listinfo/ironruby-core > >
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