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diff --git a/src/vppinfra/smp.h b/src/vppinfra/smp.h
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+/*
+ * Copyright (c) 2015 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/*
+  Copyright (c) 2001-2005 Eliot Dresselhaus
+
+  Permission is hereby granted, free of charge, to any person obtaining
+  a copy of this software and associated documentation files (the
+  "Software"), to deal in the Software without restriction, including
+  without limitation the rights to use, copy, modify, merge, publish,
+  distribute, sublicense, and/or sell copies of the Software, and to
+  permit persons to whom the Software is furnished to do so, subject to
+  the following conditions:
+
+  The above copyright notice and this permission notice shall be
+  included in all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#ifndef included_clib_smp_h
+#define included_clib_smp_h
+
+#include <vppinfra/cache.h>
+#include <vppinfra/os.h>	/* for os_panic */
+
+#define clib_smp_compare_and_swap(addr,new,old) __sync_val_compare_and_swap(addr,old,new)
+#define clib_smp_swap(addr,new) __sync_lock_test_and_set(addr,new)
+#define clib_smp_atomic_add(addr,increment) __sync_fetch_and_add(addr,increment)
+
+#if defined (i386) || defined (__x86_64__)
+#define clib_smp_pause() do { asm volatile ("pause"); } while (0)
+#endif
+
+#ifndef clib_smp_pause
+#define clib_smp_pause() do { } while (0)
+#endif
+
+#ifdef CLIB_UNIX
+#include <sched.h>
+
+always_inline void
+os_sched_yield (void)
+{
+  sched_yield ();
+}
+#else
+always_inline void
+os_sched_yield (void)
+{
+  clib_smp_pause ();
+}
+#endif
+
+
+#endif /* included_clib_smp_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */