multithreading 无法使用 gdb 调试多线程应用程序
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Unable to Debug Multi-Threaded Application with gdb
提问by Samuel
I am debugging a multi-threaded application with gdb, but when I start the program in gdb I get the warning:
我正在使用 gdb 调试多线程应用程序，但是当我在 gdb 中启动程序时，我收到警告：
warning: Unable to find libthread_db matching inferior's thread library, thread debugging will not be available.
警告：无法找到匹配下级线程库的libthread_db，线程调试将不可用。
I can still debug, but I can't debug anything other than the main thread. I have read forums that suggest installing the packages libthread-db1 and glibc-dbg, but this does not correct the problem for me.
我仍然可以调试，但除了主线程我不能调试任何东西。我已经阅读了建议安装软件包 libthread-db1 和 glibc-dbg 的论坛，但这并不能解决我的问题。
On my machine I have the 3 files /lib/libthread_db.so.1, /lib/.debug/libthread_db-1.0.so, and /lib/libthread_db-1.0.so. I tried creating symbolic links in /libwith the name libthread_db.so, one time pointing at the /lib/libthread_db.so.1file, and another time pointing at the /lib/libthread_db-1.0.sofile, and also I created the symbolic link /lib/.debug/libthread_db.sopointing to /lib/.debug/libthread_db-1.0.so, all with no luck.
在我的机器我有3个文件/lib/libthread_db.so.1，/lib/.debug/libthread_db-1.0.so和/lib/libthread_db-1.0.so。我尝试/lib使用 name创建符号链接libthread_db.so，一次指向/lib/libthread_db.so.1文件，另一次指向/lib/libthread_db-1.0.so文件，并且我还创建了/lib/.debug/libthread_db.so指向的符号链接/lib/.debug/libthread_db-1.0.so，但都没有运气。
In gdb I have tried setting libthread-db-search-pathto /lib(with the symlink once set to libthread_db.so.1, and once to libthread_db-1.0.so, and also set to /lib/.debug.
在 gdb 中，我尝试设置libthread-db-search-path为/lib（符号链接一次设置为libthread_db.so.1，一次设置为，libthread_db-1.0.so还设置为/lib/.debug.
Any suggestions? I am using Angstrom Linux v2.6.39 for the BeagleBoard-xm.
有什么建议？我为 BeagleBoard-xm 使用 Angstrom Linux v2.6.39。
回答by Employed Russian
warning: Unable to find libthread_db matching inferior's thread library
警告：无法找到与下级线程库匹配的 libthread_db
This means that your /lib/libthread_db.so.1does not match your /lib/libpthread.so.0. Such mismatch could be the result of you installing different versions of libcand libthread_dbpackages, or updating one or the other outside of the package management system. It could also be an error in your packages (i.e. they may not be built correctly).
这意味着/lib/libthread_db.so.1您的/lib/libpthread.so.0. 这种不匹配可能是由于您安装了不同版本的libc和libthread_db软件包，或者在软件包管理系统之外更新了一个或另一个。它也可能是您的包中的错误（即它们可能没有正确构建）。
You should ignore/lib/.debug/*-- that is notthe library you are looking for.
你应该忽略/lib/.debug/*——那不是你要找的图书馆。
回答by Tony K.
You are correct in trying to use
您尝试使用是正确的
set libthread-db-search-path [path]
however, it seems you have still not pointed it at a version of libthread_db that is compatible with the pthreads library you're using.
但是，您似乎仍未将其指向与您正在使用的 pthreads 库兼容的 libthread_db 版本。
First, check which pthread library you're linked to using ldd:
首先，使用 ldd 检查您链接到的 pthread 库：
ldd your_executable
then make sure the libthread-db-search-path points to a location that has a compatible version of libthread_db with whatever libpthread you're getting. It could be that you're dynamic linker path is getting a different pthread library than you expect.
然后确保 libthread-db-search-path 指向一个位置，该位置具有与您获得的任何 libpthread 兼容的 libthread_db 版本。可能是您的动态链接器路径获得了与您预期不同的 pthread 库。
