I'm trying to figure out how to build demux.
Demux supports event handlers:
select (all platforms)
poll (posix)
epoll (linux)
kqueue (osx)
evtport (solaris)
win (win32)
So for example on Linux you have 3 choices.
At present the *.fpc files is generated by lpsrc/flx_maker
which also selects the switch types for the compiler on
Windows like /DEFAULTLIB: for MSVC, and -l for Cygwin
or other gcc cross compiler.
In addition there are some thread safe variants of select.
The complete logic is in
buildsystem/demux.py
There are a couple of ways to handle this.
Demux is needed for asynchronous event handling.
We have two main kinds:
alarm clock
sockets
In theory file I/O can be asynchronous but last I looked the
handling in Linux is worthless (emulated by pthreads FFS!
I was doing this 30 years ago, Linux is really backward in some ways).
There are a couple of ways to handle this generically.
1. Build everything, but use conditional compilation in the C++ code
to #ifdef out unwanted stuff. For the build system this is easiest.
Judy works that way.
2. Make subpackages, and then a virtual package that selects one.
Although this is nice in theory, my current build code cannot handle that.
That is, src directories and source file patterns cannot cascade.
Now the thing is flx_pkgconfig could easily cascade things, but we
cannot do it on Requires field because that would make a library
dependent on another satisfy the dependency at *source* level.
This is one of those times where a simple database concept isn't
enough and we really need a programmed solution.
--
john skaller
skal...@users.sourceforge.net
http://felix-lang.org
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