Identify the hung thread using the Wait Chain Traversal API

base/win/wait_chain.h

Index: base/win/wait_chain.h
diff --git a/base/win/wait_chain.h b/base/win/wait_chain.h
new file mode 100644
index 0000000000000000000000000000000000000000..3c8f8771e90f660c111381972b8a9ab1a2a45110
--- /dev/null
+++ b/base/win/wait_chain.h
@@ -0,0 +1,34 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_WIN_WAIT_CHAIN_H_
+#define BASE_WIN_WAIT_CHAIN_H_
+
+#include <windows.h>
+#include <wct.h>
+
+#include <vector>
+
+namespace base {
+namespace win {
+
+using WaitChainNodeVector = std::vector<WAITCHAIN_NODE_INFO>;
+
+// Gets the wait chain for |thread_id|. Also specifies if the |wait_chain|
+// contains a deadlock. Returns true on success.
+//
+// From MSDN: A wait chain is an alternating sequence of threads and
+// synchronization objects; each thread waits for the object that follows it,
+// which is owned by the subsequent thread in the chain.
+bool GetThreadWaitChain(DWORD thread_id,
+                        WaitChainNodeVector* wait_chain,
+                        bool* is_deadlock);
+
+// Returns a string that represents the node for a wait chain.
+std::wstring WaitChainNodeToString(const WAITCHAIN_NODE_INFO& node);

[Nico, 2016/04/12 19:55:17]

prefer string16 in new code, please

[Patrick Monette, 2016/04/12 21:47:48]

Done.

+
+}  // namespace win
+}  // namespace base
+
+#endif  // BASE_WIN_WAIT_CHAIN_H_