svn commit: r200274 - head/lib/libc/gen

[Garrett Wollman]

<<On Thu, 10 Dec 2009 00:24:28 +0000 (GMT), Robert Watson <rwatson at FreeBSD.org> said:

> It's beginning to sound like our POSIX semaphores should be behaving more like 
> umtx, which requires only a shared page, and less like file descriptors.  Of 
> course, that would make the global namespace more tricky...

Ultimately, the problem is that "POSIX semaphores" are actually three
different kinds of object, which just happen to ostensibly use the
same programming interface.

-GAWollman