打印所有线程的堆栈信息

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小牛编辑

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2023-12-01

#include <stdio.h>
#include <pthread.h>
#include <unistd.h>
int a = 0;

void *thread1_func(void *p_arg)
{
        while (1)
        {
                a++;
                sleep(10);
        }
}

int main(int argc, char* argv[])
{
        pthread_t t1, t2;
        pthread_create(&t1, NULL, thread1_func, NULL);
        pthread_create(&t2, NULL, thread1_func, NULL);

        sleep(1000);
        return 0;
}

技巧

gdb可以使用“thread apply all bt”命令打印所有线程的堆栈信息。以上面程序为例:

(gdb) thread apply all bt

Thread 3 (Thread -1210868832 (LWP 26975)):
#0  0xb7dcc96c in __gxx_personality_v0 () from /lib/libc.so.6
#1  0xb7dcc77f in sleep () from /lib/libc.so.6
#2  0x08048575 in thread1_func ()
#3  0xb7e871eb in start_thread () from /lib/libpthread.so.0
#4  0xb7e007fe in clone () from /lib/libc.so.6

Thread 2 (Thread -1219257440 (LWP 26976)):
#0  0xb7dcc96c in __gxx_personality_v0 () from /lib/libc.so.6
#1  0xb7dcc77f in sleep () from /lib/libc.so.6
#2  0x08048575 in thread1_func ()
#3  0xb7e871eb in start_thread () from /lib/libpthread.so.0
#4  0xb7e007fe in clone () from /lib/libc.so.6

Thread 1 (Thread -1210866000 (LWP 26974)):
#0  0xb7dcc96c in __gxx_personality_v0 () from /lib/libc.so.6
#1  0xb7dcc77f in sleep () from /lib/libc.so.6
#2  0x08048547 in main ()
#0  0xb7dcc96c in __gxx_personality_v0 () from /lib/libc.so.6

可以看到，使用“thread apply all bt”命令以后，会对所有的线程实施backtrace命令。thread apply [thread-id-list] [all] args 也可以对指定的线程ID列表进行执行：

(gdb) thread apply 1-2 bt

Thread 1 (Thread -1210866000 (LWP 26974)):
#0  0xb7dcc96c in __gxx_personality_v0 () from /lib/libc.so.6
#1  0xb7dcc77f in sleep () from /lib/libc.so.6
#2  0x08048547 in main ()

Thread 2 (Thread -1219257440 (LWP 26976)):
#0  0xb7dcc96c in __gxx_personality_v0 () from /lib/libc.so.6
#1  0xb7dcc77f in sleep () from /lib/libc.so.6
#2  0x08048575 in thread1_func ()
#3  0xb7e871eb in start_thread () from /lib/libpthread.so.0
#4  0xb7e007fe in clone () from /lib/libc.so.6
#0  0xb7dcc96c in __gxx_personality_v0 () from /lib/libc.so.6

thread apply更多用法和thread-id-list的格式用法参见 gdb手册.