[ruby-core:31429] [rubysoc] Semaphore implementation

Hello,

This time I was working on Semaphore. It's on my semaphore branch
(http://github.com/panaggio/ruby/compare/queue...semaphore#files_bucket
although github is not comparing them correctly =/)

I'd like some feedback on the ruby implementation
(http://github.com/panaggio/ruby/compare/panaggio:queue...semaphore#diff-3)
and on the tests
(http://github.com/panaggio/ruby/compare/panaggio:queue...semaphore#diff-4).

Now I'm solving a lot of annoying bugs (racing conditions are horrible
to debug and solve =/) and polishing the code, but I know there's need
to more features, like Semaphore#broadcast and Semaphore#try_wait,
that I'll implement soon. But I need to know it there's anything more
missing, or anything that could be just removed (like num_waiting).

I don't think these tests can help me find problems on the code, but I
couldn't think about anything better. Any insight here you be very
appreciated.

This feedback will also help me a lot to implement it in C, as I'll
have a list of features and a direction to go to. I'll continue the C
implementation as soon as I can have the ruby implementation as a
reference (just to have something to test against - I'll try to
implement it in C using as much native code as possible).

There's some C code there (thread*), but it's very raw by now. Caleb
have told me about a lot of conceptual and implementation mistakes I
did, specially on thread_win32.c, and I know that there may be a lot
more. Any advice in here (if possible - I know it's a horrible code by
now)  will be also appreciated.

Again, thanks in advance for all the help. You all gave me a lot of
good insights  last time I asked.

Ricardo Panaggio