GDB如何知道线程 [英] How does GDB know about threads

问题描述

• 它如何能够判断哪一个是当前线程？


$ b

我的问题是如何知道每个线程相关的所有上下文信息？针对它在GDB内部的工作方式，我没有任何问题调试线程，这完全是关于GDB内部的。





我发现了 GDB内部文档，但线程部分目前为空。

全部我的其他研究让我对调试多线程程序产生疑问，而且我似乎无法挖掘出我正在寻找的确切信息。





编辑：





到目前为止，GDB似乎截获了信号（感谢ptrace？），并发现线程何时创建。但我想更确切地知道它是如何实际完成的。





我还有一个特殊的体系结构，它带有一个配置了--enable-threads =单。然而，GDB能够列出当前的线程。这可能怎么样？





欢迎您提供每种知识，有用的链接或文档。





谢谢。

>



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2014年3月5日更新





我查看了libthread_db，发现GDB允许提供一个定制的库来调试线程（参见文档的信息）





我试图做到这一点，并能够提供有关我的线程（ID，启动函数，堆栈等gdb信息）通过实现 gdb / common / gdb_thread_db.h 中定义的 td_thr_get_info 函数。





我仍然无法向gdb提供关于我的线程上下文的任何信息，但仍然在寻找关于此问题的任何线索。





谢谢。



PS：这个问题似乎解决了相同的问题，但不幸的是没有方向了。

试试搜索有关 libthread_db 。

I am trying to understand more deeply how GDB knows about threads.

• How is it able to tell which one is the current thread ?
• How does it know all the context information relative to each thread ?

My question aims at how it works internally in GDB, I do not have any problem debugging threads, it is all really about GDB's internals.

I found the GDB internals documentation, but the threads part is empty as for now.
All my other research lead me to question about debugging multi-threaded programs and I cannot seem to dig the precise information I am looking for.

Edit :

So far it seems that GDB intercepts signals (thanks to ptrace?) and finds out when threads are created. But I would like to know more precisely how it is actually done.

I also have a particular architecture that comes with a GDB that was configured with --enable-threads=single. That GDB is however able to list the current threads. How is this possible ?

Every knowledge, useful links or documentations are welcomed.

Thanks.

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Update March 5 '14

I have looked into the libthread_db and found out that GDB allows providing a custom built library to debug threads (see doc for information)

I have tried to do that and am able to provide gdb information about my thread (ID, start function, stack and such) by implementing the td_thr_get_info function defined in gdb/common/gdb_thread_db.h.

Still i am not able to give gdb any information about the context of my threads and still looking for any clue on that issue.

Thanks.

PS: This question seem to address the same questions but has unfortunately no directions too.

解决方案

Try to search for information about libthread_db.

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