diff --git a/autolock.cpp b/autolock.cpp
new file mode 100644
index 0000000..1a2ded7
--- /dev/null
+++ b/autolock.cpp
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#define ATRACE_TAG ATRACE_TAG_GRAPHICS
+#define LOG_TAG "hwc-drm-auto-lock"
+
+#include "autolock.h"
+
+#include <errno.h>
+#include <pthread.h>
+
+#include <cutils/log.h>
+
+namespace android {
+
+int AutoLock::Lock() {
+  if (locked_) {
+    ALOGE("Invalid attempt to double lock AutoLock %s", name_);
+    return -EINVAL;
+  }
+  int ret = pthread_mutex_lock(mutex_);
+  if (ret) {
+    ALOGE("Failed to acquire %s lock %d", name_, ret);
+    return ret;
+  }
+  locked_ = true;
+  return 0;
+}
+
+int AutoLock::Unlock() {
+  if (!locked_) {
+    ALOGE("Invalid attempt to unlock unlocked AutoLock %s", name_);
+    return -EINVAL;
+  }
+  int ret = pthread_mutex_unlock(mutex_);
+  if (ret) {
+    ALOGE("Failed to release %s lock %d", name_, ret);
+    return ret;
+  }
+  locked_ = false;
+  return 0;
+}
+}