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diff --git a/base/synchronization/lock_posix.h b/base/synchronization/lock_posix.h
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+// Copyright (C) 2013 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_POSIX_H_
+#define I18N_PHONENUMBERS_BASE_SYNCHRONIZATION_LOCK_POSIX_H_
+
+#include <pthread.h>
+
+#include "phonenumbers/base/basictypes.h"
+#include "phonenumbers/base/logging.h"
+
+namespace i18n {
+namespace phonenumbers {
+
+class Lock {
+ public:
+  Lock() {
+    const int ret = pthread_mutex_init(&mutex_, NULL);
+    (void) ret;
+    DCHECK_EQ(0, ret);
+  }
+
+  ~Lock() {
+    const int ret = pthread_mutex_destroy(&mutex_);
+    (void) ret;
+    DCHECK_EQ(0, ret);
+  }
+
+  void Acquire() const {
+    int ret = pthread_mutex_lock(&mutex_);
+    (void) ret;
+    DCHECK_EQ(0, ret);
+  }
+
+  void Release() const {
+    int ret = pthread_mutex_unlock(&mutex_);
+    (void) ret;
+    DCHECK_EQ(0, ret);
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(Lock);
+
+  mutable pthread_mutex_t mutex_;
+};
+
+}  // namespace phonenumbers
+}  // namespace i18n
+
+#endif  // I18N_PHONENUMBERS_BASE_SYNCHRONIZATION_LOCK_POSIX_H_