1 files changed, 43 insertions, 0 deletions
diff --git a/third_party/libwebrtc/rtc_base/synchronization/mutex_abseil.h b/third_party/libwebrtc/rtc_base/synchronization/mutex_abseil.h
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index 0000000000..d42f974f10
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+++ b/third_party/libwebrtc/rtc_base/synchronization/mutex_abseil.h
@@ -0,0 +1,43 @@
+/*
+ *  Copyright 2020 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef RTC_BASE_SYNCHRONIZATION_MUTEX_ABSEIL_H_
+#define RTC_BASE_SYNCHRONIZATION_MUTEX_ABSEIL_H_
+
+#include "absl/base/attributes.h"
+#include "absl/synchronization/mutex.h"
+#include "rtc_base/thread_annotations.h"
+
+namespace webrtc {
+
+class RTC_LOCKABLE MutexImpl final {
+ public:
+  MutexImpl() = default;
+  MutexImpl(const MutexImpl&) = delete;
+  MutexImpl& operator=(const MutexImpl&) = delete;
+
+  void Lock() RTC_EXCLUSIVE_LOCK_FUNCTION() { mutex_.Lock(); }
+  ABSL_MUST_USE_RESULT bool TryLock() RTC_EXCLUSIVE_TRYLOCK_FUNCTION(true) {
+    return mutex_.TryLock();
+  }
+  void AssertHeld() const RTC_ASSERT_EXCLUSIVE_LOCK() {
+#if RTC_DCHECK_IS_ON
+    mutex_.AssertHeld();
+#endif
+  }
+  void Unlock() RTC_UNLOCK_FUNCTION() { mutex_.Unlock(); }
+
+ private:
+  absl::Mutex mutex_;
+};
+
+}  // namespace webrtc
+
+#endif  // RTC_BASE_SYNCHRONIZATION_MUTEX_ABSEIL_H_