1 files changed, 36 insertions, 0 deletions
diff --git a/webrtc/base/thread_checker_impl.cc b/webrtc/base/thread_checker_impl.cc
new file mode 100644
index 0000000000..ea88308772
--- /dev/null
+++ b/webrtc/base/thread_checker_impl.cc
@@ -0,0 +1,36 @@
+/*
+ *  Copyright (c) 2014 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.
+ */
+
+// Borrowed from Chromium's src/base/threading/thread_checker_impl.cc.
+
+#include "webrtc/base/thread_checker_impl.h"
+
+namespace rtc {
+
+ThreadCheckerImpl::ThreadCheckerImpl() : valid_thread_(CurrentThreadRef()) {
+}
+
+ThreadCheckerImpl::~ThreadCheckerImpl() {
+}
+
+bool ThreadCheckerImpl::CalledOnValidThread() const {
+  const PlatformThreadRef current_thread = CurrentThreadRef();
+  CritScope scoped_lock(&lock_);
+  if (!valid_thread_)  // Set if previously detached.
+    valid_thread_ = current_thread;
+  return IsThreadRefEqual(valid_thread_, current_thread);
+}
+
+void ThreadCheckerImpl::DetachFromThread() {
+  CritScope scoped_lock(&lock_);
+  valid_thread_ = 0;
+}
+
+}  // namespace rtc