ThreadScope concept to check variable accessed on correct thread

webrtc/base/thread_scope.h

+/*
+ *  Copyright (c) 2016 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 WEBRTC_BASE_THREAD_SCOPE_H_
+#define WEBRTC_BASE_THREAD_SCOPE_H_
+
+#include "webrtc/base/checks.h"
+// #include webrtc/base/task_queue.h"
+#include "webrtc/base/thread.h"
+#include "webrtc/base/thread_annotations.h"
+#include "webrtc/base/thread_checker.h"
+
+namespace rtc {
+// ThreadScope mimic CritScope.
+class SCOPED_LOCKABLE ThreadScope {
+ public:
+  template<typename ThreadLikeObject>
+  explicit ThreadScope(const ThreadLikeObject* thread)
+      EXCLUSIVE_LOCK_FUNCTION(thread) {}
+
+  static bool IsCurrent(const Thread* thread) {
+    return thread->IsCurrent();
+  }
+  static bool IsCurrent(const ThreadChecker* checker) {
+    return checker->CalledOnValidThread();
+  }
+  /*
+  static bool IsCurrent(const TaskQueue* queue) {
+    return queue->IsCurrent();
+  } */
+
+  ~ThreadScope() UNLOCK_FUNCTION() {}
+ private:
+  RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(ThreadScope);
+};
+
+}  // namespace rtc
+
+// Macro so that DCHECK report correct __FILE__ and __LINE__
+#define RTC_DCHECK_RUN_ON(thread_like_object) \
+  rtc::ThreadScope check(thread_like_object); \
+  RTC_DCHECK(rtc::ThreadScope::IsCurrent(thread_like_object))
+
+// Forward macros to avoid word 'lock' when annotating threads
+#define RTC_MUST_RUN_ON(thread_like_object) \
+  EXCLUSIVE_LOCKS_REQUIRED(thread_like_object)
+#define RTC_MUST_BE_ACCESSED_FROM(thread_like_object) \
+  GUARDED_BY(thread_like_object)
+
+#endif  // WEBRTC_BASE_THREAD_SCOPE_H_