Release based on cl/313536507.

Signed-off-by: Alexey Polyudov <apolyudov@google.com>
Change-Id: I83ec7dee1a7ef6f4bdfd47482c94d03910525b7e

cpp/platform_v2/base/base_mutex_lock.h

@@ -0,0 +1,40 @@
+// Copyright 2020 Google LLC
+//
+// 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
+//
+//     https://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.
+
+#ifndef PLATFORM_V2_BASE_BASE_MUTEX_LOCK_H_
+#define PLATFORM_V2_BASE_BASE_MUTEX_LOCK_H_
+
+#include "platform_v2/api/mutex.h"
+#include "absl/base/thread_annotations.h"
+
+namespace location {
+namespace nearby {
+
+// An RAII mechanism to acquire a Lock over a block of code.
+class ABSL_SCOPED_LOCKABLE BaseMutexLock final {
+ public:
+  explicit BaseMutexLock(api::Mutex* mutex) ABSL_EXCLUSIVE_LOCK_FUNCTION(mutex)
+      : mutex_(mutex) {
+    mutex_->Lock();
+  }
+  ~BaseMutexLock() ABSL_UNLOCK_FUNCTION() { mutex_->Unlock(); }
+
+ private:
+  api::Mutex* mutex_;
+};
+
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_V2_BASE_BASE_MUTEX_LOCK_H_