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-rw-r--r--absl/synchronization/mutex.cc14
1 files changed, 14 insertions, 0 deletions
diff --git a/absl/synchronization/mutex.cc b/absl/synchronization/mutex.cc
index b2aa743977ac..06a058cf710b 100644
--- a/absl/synchronization/mutex.cc
+++ b/absl/synchronization/mutex.cc
@@ -1,3 +1,17 @@
+// Copyright 2017 The Abseil 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.
+
 #include "absl/synchronization/mutex.h"
 
 #ifdef _WIN32