I completely derailed my regular project and just worked on coroutines
all day. Here's what I've got so far.
* libCoroutine does not build as-is on Mac OS X 10.5. (It's trying to
implement its own ucontext API, which then has name collisions with
the one that's already in the OS.)
* I tweaked some #ifdefs and got libCoroutine to run, but any
nontrivial uses of it crashed hard. Several hours later I tracked this
down to what appears to be a bug in the system header <sys/
_structs.h>. Fortunately it was easy to work around. (I've posted a
message to the darwin-userlevel mailing list asking about this.)
* Since I was already modifying libCoroutine, and since 90% of its
code is just for cross-platform compatibility, I tweezed out just the
part that's necessary for Mac OS X and made my own "CoroX.c". It's
only 150 lines of code. I can actually read it and understand what
it's doing. (I've kept Steve's copyright notice and made it clear this
is a derivative work.)
* Finally I put this into a Mercurial repository and hosted it on my
website: http://mooseyard.com/hg/hgwebdir.cgi/Actors/
If you use Mercurial, you can just clone from the above URL to get a
local repo. If you don't, you can use the "files" or "zip" links on
that web page to browse or download the code.
Next I'd like to implement a simpler "generator" style API (where a
coroutine calls "yield" to return a value to its caller) since that's
easier for me to get my head around than the general model where every
coroutine chooses which one to run next. From there, actors shouldn't
be too hard to do.
One potential problem is the interaction with Cocoa features that
implicitly rely on the stack: exceptions and autorelease pools. I
suspect that coroutines will confuse both of those.
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