如何使用gdb查找线程树？ [英] How do I find thread tree using gdb?

问题描述

我在网上搜索，但徒劳无功。 info thread 提供了在附加gdb的进程中当前活动的所有线程。我想知道gdb是否可能显示线程树，即列出的线程之间的父子关系。

I searched online but in vain. info thread provides all the threads the are currently alive in the process attached with gdb. I want to know if it is possible for gdb to show a thread tree i.e. parent child relationship between the listed threads.

为什么我想知道？十几个线程，其中一个线程正在等待其子线程的join_all（）。

Why do I want to know that?: Amongst a dozen threads, one of the thread is waiting on join_all() of its child threads. If I can understand on which threads is the main thread waiting on, I can debug better.

元数据：
gdb版本7.7

Metadata: gdb version 7.7

推荐答案

我不认为你想要的信息是可用的，所以gdb没有内置的方式显示它。

I don't think the information you want is available, so gdb doesn't have a built-in way to display it.

如果这很重要，我想你有几个选择。

If it is very important I guess you have a couple of choices.

一个，在你的后续评论中，你提到一个线程试图加入它的孩子。所以，作为一个快速和脏的东西，你可以切换到这个线程，上，并看看它正在等待的线程。

One, in your follow-up comment you mention that a thread is trying to join its children. So, as a quick-and-dirty thing you could switch to that thread, go "up", and look at the threads it is waiting on.

或者，你可以使用Python编写一些gdb代码以某种方式自动化这些代码，无论是特定于应用程序还是通过在适当的位置（pthread_create等）设置断点来记录parentage信息。这有点难。

Or, you could use Python to write some gdb code to automate this in a way, either app-specific or by setting breakpoints at the appropriate spots (pthread_create, etc) to record the parentage information. This is somewhat harder.

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