1 files changed, 45 insertions, 0 deletions
diff --git a/chromium/third_party/nearby/src/internal/platform/mutex_lock.h b/chromium/third_party/nearby/src/internal/platform/mutex_lock.h
new file mode 100644
index 00000000000..463ef8b7af0
--- /dev/null
+++ b/chromium/third_party/nearby/src/internal/platform/mutex_lock.h
@@ -0,0 +1,45 @@
+// 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_PUBLIC_MUTEX_LOCK_H_
+#define PLATFORM_PUBLIC_MUTEX_LOCK_H_
+
+#include "absl/base/thread_annotations.h"
+#include "internal/platform/implementation/mutex.h"
+#include "internal/platform/mutex.h"
+
+namespace location {
+namespace nearby {
+
+// An RAII mechanism to acquire a Lock over a block of code.
+class ABSL_SCOPED_LOCKABLE MutexLock final {
+ public:
+  explicit MutexLock(Mutex* mutex) ABSL_EXCLUSIVE_LOCK_FUNCTION(mutex)
+      : mutex_(mutex->impl_.get()) {
+    mutex_->Lock();
+  }
+  explicit MutexLock(RecursiveMutex* mutex) ABSL_EXCLUSIVE_LOCK_FUNCTION(mutex)
+      : mutex_(mutex->impl_.get()) {
+    mutex_->Lock();
+  }
+  ~MutexLock() ABSL_UNLOCK_FUNCTION() { mutex_->Unlock(); }
+
+ private:
+  api::Mutex* mutex_;
+};
+
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_PUBLIC_MUTEX_LOCK_H_