cReactor: fast reactor core written in C

STATUS: unmaintained, causes build problems, doesn't actually work.

Actually, the TCP server pieces probably work. Much of the test suite fails
because it does not offer all the functionality of the other reactors:
client support, UNIX sockets, UDP, and probably others.

It needs to be redesigned and rewritten.

This module used to live in twisted/internet/cReactor/ with the following
files at the following old revisions:

.cvsignore                                          1.1        Up-to-date
cDelayedCall.c                                      1.3        Up-to-date
cReactor.c                                          1.14       Up-to-date
cReactor.h                                          1.12       Up-to-date
cReactorBuffer.c                                    1.2        Up-to-date
cReactorModule.c                                    1.4        Up-to-date
cReactorTCP.c                                       1.10       Up-to-date
cReactorThread.c                                    1.3        Up-to-date
cReactorTime.c                                      1.5        Up-to-date
cReactorTransport.c                                 1.3        Up-to-date
cReactorUtil.c                                      1.5        Up-to-date
cSystemEvent.c                                      1.3        Up-to-date

To compile it, the following clause was present in setup.py (v1.147), in the
_detect_modules() method:


        # The C reactor
        # if python has poll support, no doubt OS supports
        try:
            import select
        except:
            select = None
        try:
            import thread
        except:
            thread = None
        if hasattr(select, "poll") and thread and not sys.platform=='darwin':
            exts.append( Extension("twisted.internet.cReactor",
                                    [
                                        "twisted/internet/cReactor/cReactorModule.c",
                                        "twisted/internet/cReactor/cReactor.c",
                                        "twisted/internet/cReactor/cReactorTime.c",
                                        "twisted/internet/cReactor/cReactorTCP.c",
                                        "twisted/internet/cReactor/cReactorTransport.c",
                                        "twisted/internet/cReactor/cReactorBuffer.c",
                                        "twisted/internet/cReactor/cReactorUtil.c",
                                        "twisted/internet/cReactor/cReactorThread.c",
                                        "twisted/internet/cReactor/cDelayedCall.c",
                                        "twisted/internet/cReactor/cSystemEvent.c",
                                    ],
                                    define_macros=define_macros) )
        else:
            self.announce("The C reactor is unavailable on this system (this is fine, don't worry about it, everything will still work).")