On Wed, Feb 11, 2009, Bruce Cran wrote: > On Wed, 11 Feb 2009 22:51:02 +0100 > Christoph Mallon <christoph.mal...@gmx.de> wrote: > > > Aniruddha Bohra schrieb: > > > On Wed, Feb 11, 2009 at 8:25 AM, Andriy Gapon <a...@icyb.net.ua> > > > wrote: > > >> on 10/02/2009 22:43 Aniruddha Bohra said the following: > > >>> You can see Click: http://read.cs.ucla.edu/click/ > > >>> It does not run on FreeBSD >4. > > >>> I have an old diff which builds on the work by Marko Zec and Bruce > > >>> Simpson, that allows me to load the click module. > > >>> http://www.cs.rutgers.edu/~bohra/click-1.5.0.diff > > >> 1. options -fpermissive -fno-exceptions -fno-rtti are passed to > > >> c++ compiler 2. there are new/delete implementations that use > > >> kernel malloc > > >> > > >> I think that #1 means that there are no exceptions, (non-trivial) > > >> dynamic_cast and typeid for kernel c++ code. > > > > > > Correct. > > > > That's a pity. Lack of exceptions negates some major benefits of C++. > > > > >> 1. do you use any global/static objects with constructors? did you > > >> have to write any code to call on those constructors when the > > >> module is loaded? > > > > > > Not sure about this one. But AFAIK, there are no global static > > > objects with constructors in Click code. > > > There is one router object that is always initialized and it is > > > updated by writing to the clickfs file system. > > > The other objects are created with new. > > > > > >> 2. did you have to write any other run-time support code or > > >> platform glue code (besides new/delete)? > > > > > > Apart from the new and delete, I think the other things were the > > > pseudofs code to initialize the file system, > > > the locks in include/click/sync.hh, the glue code in atomic.hh. > > > > > > > > >> 3. I assume virtual inheritance can be used in kernel code? do you > > >> use it? > > > > Virtual inheritence needs no support from the "outside", so it is > > available. > > > > > Yes. For example, all objects inherit from "Element" and that > > > defines virtual functions. (include/click/element.hh) > > > > Virtual inheritance is something completely different than virtual > > methods. > > Microsoft has an overview of using C++ in kernel drivers at > http://www.microsoft.com/whdc/driver/kernel/KMcode.mspx . It sounds > like the situation on FreeBSD may be somewhat similar.
FreeBSD doesn't support loading kernel code and data into pageable memory like Windows does, so a lot of the paging-related problems they're talking about aren't issues for us. _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
