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H A Dkern_umtx.cdiff 170300 Mon Jun 04 21:54:50 MDT 2007 jeff Commit 8/14 of sched_lock decomposition.
- Use a global umtx spinlock to protect the sleep queues now that there
is no global scheduler lock.
- Use thread_lock() to protect thread state.

Tested by: kris, current@
Tested on: i386, amd64, ULE, 4BSD, libthr, libkse, PREEMPTION, etc.
Discussed with: kris, attilio, kmacy, jhb, julian, bde (small parts each)

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