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From: David Xu <davidxu@FreeBSD.org>
Date: Tue, 2 Nov 2010 07:46:31 +0000 (UTC)
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Subject: svn commit: r214660 - user/davidxu/libthr/lib/libthr/thread
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Author: davidxu
Date: Tue Nov  2 07:46:31 2010
New Revision: 214660
URL: http://svn.freebsd.org/changeset/base/214660

Log:
  Add missing function.

Modified:
  user/davidxu/libthr/lib/libthr/thread/thr_umtx.c

Modified: user/davidxu/libthr/lib/libthr/thread/thr_umtx.c
==============================================================================
--- user/davidxu/libthr/lib/libthr/thread/thr_umtx.c	Tue Nov  2 06:58:01 2010	(r214659)
+++ user/davidxu/libthr/lib/libthr/thread/thr_umtx.c	Tue Nov  2 07:46:31 2010	(r214660)
@@ -297,6 +297,19 @@ _thr_rwl_unlock(struct urwlock *rwlock)
 		PANIC("unlock error");
 }
 
+int
+__thr_umtx_lock(volatile umtx_t *mtx)
+{
+	int v;
+  
+	do {
+		v = *mtx;
+		if (v == 2 || atomic_cmpset_acq_int(mtx, 1, 2))
+			_thr_umtx_wait_uint(mtx, 2, NULL, 0);
+	} while (!atomic_cmpset_acq_int(mtx, 0, 2));
+	return (0);
+}
+
 #define LOOPS 500
 
 int