diff --git a/lib/libspl/include/thread.h b/lib/libspl/include/thread.h
index 64328e2913..a72f6d2b1b 100644
--- a/lib/libspl/include/thread.h
+++ b/lib/libspl/include/thread.h
@@ -1,96 +1,30 @@
 /*
- * Copyright (c) 2006 OmniTI, Inc. All rights reserved
- * This header file distributed under the terms of the CDDL.
- * Portions Copyright 2004 Sun Microsystems, Inc. All Rights reserved.
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
  */
 
-#include <pthread.h>
-#include <sys/time.h>
-#include <sys/types.h>
+#ifndef _LIBSPL_THREAD_H
+#define _LIBSPL_THREAD_H
 
-#ifndef _SYS_THREAD_H
-#define _SYS_THREAD_H
-
-typedef pthread_t			thread_t;
-typedef pthread_mutex_t			mutex_t;
-typedef pthread_cond_t			cond_t;
-
-#define THR_BOUND			1
-#define THR_DETACHED			2
-#define THR_DAEMON			4
-
-#define USYNC_THREAD			0x00 /* private to a process */
-#define USYNC_PROCESS			0x01 /* shared by processes */
-
-#define thr_self()			pthread_self()
-#define thr_sigsetmask			pthread_sigmask
-#define __nthreads()			2 /* XXX: Force multi-thread */
-
-static inline int
-thr_create(void *stack_base, size_t stack_size,
-	   void *(*start_func)(void *), void *arg,
-	   long flags, thread_t *new_thread_id)
-{
-	pthread_attr_t attr;
-	int rc;
-
-	pthread_attr_init(&attr);
-
-	if (flags & THR_DETACHED)
-		pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
-
-	rc = pthread_create(new_thread_id, &attr, start_func, arg);
-	pthread_attr_destroy(&attr);
-
-	return rc;
-}
-#endif /* _SYS_THREAD_H */
-
-#ifndef _SYS_MUTEX_H
-#define _SYS_MUTEX_H
-
-static inline int
-_mutex_held(mutex_t *mp)
-{
-	int rc;
-
-	rc = pthread_mutex_trylock(mp);
-	if (rc)
-		return rc;
-
-	pthread_mutex_unlock(mp);
-	return rc;
-}
-
-static inline void
-_mutex_init(mutex_t *mp, int type, void *arg)
-{
-	pthread_mutex_init(mp, NULL);
-}
-
-#define mutex_init(mp, type, arg)	_mutex_init(mp, type, arg)
-#define mutex_lock(mp)			pthread_mutex_lock(mp)
-#define mutex_unlock(mp)		pthread_mutex_unlock(mp)
-#define mutex_destroy(mp)		pthread_mutex_destroy(mp)
-#define mutex_trylock(mp)		pthread_mutex_trylock(mp)
-#define DEFAULTMUTEX			PTHREAD_MUTEX_INITIALIZER
-#define DEFAULTCV			PTHREAD_COND_INITIALIZER
-#define MUTEX_HELD(mp)			_mutex_held(mp)
-#endif /* _SYS_MUTEX_H */
-
-#ifndef _SYS_CONDVAR_H
-#define _SYS_CONDVAR_H
-
-#define cond_init(c, type, arg)		pthread_cond_init(c, NULL)
-#define cond_wait(c, m)			pthread_cond_wait(c, m)
-#define _cond_wait(c, m)		pthread_cond_wait(c, m)
-#define cond_signal(c)			pthread_cond_signal(c)
-#define cond_broadcast(c)		pthread_cond_broadcast(c)
-#define cond_destroy(c)			pthread_cond_destroy(c)
-#define cond_timedwait			pthread_cond_timedwait
-#define _cond_timedwait			pthread_cond_timedwait
-#endif /* _SYS_CONDVAR_H */
-
-#ifndef RTLD_FIRST
-#define RTLD_FIRST			0
-#endif
+#endif /* _LIBSPL_THREAD_H */