Thread: fix inspection issues

svn path=/trunk/boost/thread/; revision=84418
Thread: fix warning.

svn path=/trunk/libs/thread/; revision=84419
Thread: fix inspection issues.

svn path=/trunk/libs/thread/; revision=84420
Thread: update latch to use generation to prevent spurious wake-ups.

svn path=/trunk/boost/thread/; revision=84421