Dag-Erling Smørgrav 5fd410a787 Add pthread_mutex_islocked_np(), a cheap way to verify that a mutex is
locked.  This is intended primarily to support the userland equivalent
of the various *_ASSERT_LOCKED() macros we have in the kernel.

MFC after:	2 weeks
2008-02-03 22:38:10 +00:00
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