* 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.)
* Then I wrote an Objective-C API around it. Only 140 lines. Here's the header:
http://mooseyard.com/hg/hgwebdir.cgi/Actors/file/tip/Coroutines/MYCoroutine.h
* 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.
—Jens
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