等待链遍历^{(Wait Chain Traversal)}是Windows 7中引入的一项功能。它是一种工具，可让您识别导致应用程序挂起或冻结的实际进程。Windows 10/8 更进一步，让您可以直接从Windows 10 任务管理器^{(Windows 10 Task Manager)}本身分析等待链。^{(Wait Chain)}我的同事Shyam简要介绍了等待链遍历^{(Wait Chain Traversal)}( WCT ) 功能，它允许调试器在谈论Windows 任务管理器的功能时诊断应用程序挂起和死锁。今天，让我们更详细地了解一下。

等待链遍历

在Windows 7中， 资源监视器^{(Resource Monitor)}提供了分析等待链^{(Wait Chain)}的能力。运行resmon以打开资源监视器^{(Resource Monitor)}。识别挂起或挂起的进程、Overview或CPU选项卡并右键单击它。在上下文菜单中，您将看到分析等待链^{(Analyze Wait Chain)}。

Windows 10/8除了资源监视器之外， ^{(Resource Monitor)}Windows 10/8现在允许您直接从Windows 任务管理器^{(Windows Task Manager)(Windows Task Manager)}本身分析等待链^{(Wait Chain)}。打开您的任务管理器^{(Task Manager)}并确定挂起或冻结的进程。右键单击它并在上下文菜单中选择分析等待链。^{(Analyze wait chain)}

分析等待链

分析等待链^{(Analyze Wait Chain)}树显示树中的哪些进程或打开的节点正在使用或等待使用树中另一个进程或子节点使用的资源，并且是所选进程继续所必需的。等待链遍历^{(Wait Chain Traversal)}( WCT ) 使Windows 调试器能够诊断应用程序挂起和死锁。您可以在TechNet^(TechNet)上阅读有关它的更多信息。

打开概览^(Overview)或CPU选项卡后，您将找到正在运行的进程列表。如果一个进程“卡住”，它将用红色文本突出显示，“未响应”。您可以右键单击该进程，并分配一个新任务，包括结束该进程。

Kill无响应、挂起、冻结进程

如果您选择分析等待链^{(Analyze Wait Chain)}，您将看到一个进程列表以及与之关联的进程树。您可能还会看到一条消息 - xyz.exe 进程正在等待另一个进程 (abc.exe)^{(xyz.exe process is waiting for another process (abc.exe))}，举个例子。如果您以管理员身份打开任务管理器^{(Task Manager)}，您将能够看到更多进程。如果您以管理员身份运行Windows ，则默认情况下，^(Windows)任务管理器^{(Task Manager)}已在Windows 8中提升。下图只是显示了盒子的外观。我的所有进程都没有足够长的时间让我得到它的Wait Tree。

你现在可以等待或者选择杀死进程，但是记住当你杀死任何进程时，如果它是系统进程，其他依赖它的函数也可能会崩溃，所以这里你要小心。

顺便说一句，Process Hacker还将帮助您找出哪些进程冻结了。什么是 Hang 也是^{(What is Hang)}如此。此实用程序^{(This utility)}会尝试检测当前挂起的软件或进程，并显示一些信息，这些信息可能使您能够理清并了解这种冻结的根源究竟是什么。

Analyze Wait Chain: Identify hung or frozen process in Windows 10

Wait Chain Traversal is a feature that was introduced in Windows 7. It is a tool that lets you identify the actual process that is resulting in a hung or frozen application. Windows 10/8 goes a step further and lets you analyze Wait Chain right from the Windows 10 Task Manager itself. My colleague Shyam had briefly touched on the Wait Chain Traversal (WCT) feature, which allows debuggers to diagnose application hangs and deadlocks while talking about the features of the Windows Task Manager. Today, let’s see it in a little more detail.

Wait Chain Traversal

In Windows 7, the Resource Monitor offers the ability to analyze Wait Chain. Run resmon to open the Resource Monitor. Identify the hung or suspended process, the Overview or CPU tab and right-click on it. In the context menu, you will see Analyze Wait Chain.

Windows 10/8 now allows you to analyze Wait Chain right from the Windows Task Manager itself, apart from the Resource Monitor. Open your Task Manager and identify the hung or frozen process. Right-click on it and select Analyze wait chain in the context menu.

Analyze Wait Chain

The Analyze Wait Chain tree shows which processes or open nodes in a tree are using or waiting to use a resource used by another process or child nodes in the tree, and is required for the selected process to continue. Wait Chain Traversal (WCT) enables Windows debuggers to diagnose application hangs and deadlocks. You can read more about it on TechNet.

Once you open the Overview or CPU tabs, you’ll find the list of running processes. If a process is “stuck”, it’ll be highlighted with red text, “Not responding”. You can right-click on the process, and assign a new task, including ending the process.

Kill Not responding, hung, frozen process

If you select Analyze Wait Chain, you will see a list of processes and the process tree associated with it. You may also get to see a message – xyz.exe process is waiting for another process (abc.exe), to give an example. If you have opened the Task Manager as an administrator, you will be able to see many more processes. If you’re running Windows as an administrator, the Task Manager will already be elevated by default in Windows 8.  The following figure just shows how the box looks. None of my processes were hanging long enough for me to get its Wait Tree.

You may now wait or choose to kill the process, but remember when you kill any process, if it is a system process, and other function dependants on it may also crash, so you have to be careful here.

Incidentally, Process Hacker will also help you find out which of your process freezes. So will What is Hang. This utility tries to detect the software or process that is currently hung, and displays some information that may allow you to sort out and understand what exactly is at the root of such freezing.

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