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diff --git a/base/synchronization/lock.h b/base/synchronization/lock.h
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+++ b/base/synchronization/lock.h
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+// Copyright (C) 2011 The Libphonenumber Authors
+//
+// 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.
+
+// Author: Philippe Liard
+
+#ifndef I18N_PHONENUMBERS_BASE_SYNCHRONIZATION_LOCK_H_
+#define I18N_PHONENUMBERS_BASE_SYNCHRONIZATION_LOCK_H_
+
+#if defined(I18N_PHONENUMBERS_USE_BOOST)
+#include <boost/thread/mutex.hpp>
+
+namespace i18n {
+namespace phonenumbers {
+
+typedef boost::mutex Lock;
+typedef boost::mutex::scoped_lock AutoLock;
+
+}  // namespace phonenumbers
+}  // namespace i18n
+
+#else  // I18N_PHONENUMBERS_USE_BOOST
+
+#include "phonenumbers/base/logging.h"
+#include "phonenumbers/base/thread_checker.h"
+
+// Dummy lock implementation on non-POSIX platforms. If you are running on a
+// different platform and care about thread-safety, please compile with
+// -DI18N_PHONENUMBERS_USE_BOOST.
+#if !defined(__linux__) && !defined(__APPLE__)
+
+namespace i18n {
+namespace phonenumbers {
+
+class Lock {
+ public:
+  Lock() : thread_checker_() {}
+
+  void Acquire() const {
+    DCHECK(thread_checker_.CalledOnValidThread());
+  }
+
+  void Release() const {
+    DCHECK(thread_checker_.CalledOnValidThread());
+  }
+
+ private:
+  const ThreadChecker thread_checker_;
+};
+
+}  // namespace phonenumbers
+}  // namespace i18n
+
+#else
+#include "phonenumbers/base/synchronization/lock_posix.h"
+#endif
+
+namespace i18n {
+namespace phonenumbers {
+
+class AutoLock {
+ public:
+  AutoLock(Lock& lock) : lock_(lock) {
+    lock_.Acquire();
+  }
+
+  ~AutoLock() {
+    lock_.Release();
+  }
+
+ private:
+  Lock& lock_;
+};
+
+}  // namespace phonenumbers
+}  // namespace i18n
+
+#endif  // I18N_PHONENUMBERS_USE_BOOST
+#endif  // I18N_PHONENUMBERS_BASE_SYNCHRONIZATION_LOCK_H_