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[Gdb-discuss] Problem with multi-thread debugging with gdbserver


From: peter_tkchoi
Subject: [Gdb-discuss] Problem with multi-thread debugging with gdbserver
Date: Thu, 27 Oct 2005 09:20:04 +0800

Hi,



  I've heard that GDB 5.3 onwards has supported remote

debugging multiple thread programs, but I still fail

to do so. I wonder what I have done wrong.



  I work with a x86 host and a x86 target, both with

linux kernel 2.4.22. I worked on a test program below,

linked with glibc:



    #include <pthread.h>

    #include <stdio.h>

    #define NUM_THREADS 5



    void *thread_function(void *arg)

    {

       printf("Hello World from %d!\n", arg);

       sleep(10);

       pthread_exit(NULL);

    }



    int main(int argc, char *argv[])

    {

       pthread_t threads[NUM_THREADS];

       int i;



       for (i = 0; i < NUM_THREADS; i++)

         pthread_create(&threads[i], NULL,

thread_function, (void *)i);

      

       for (i = 0; i < NUM_THREADS; i++)

          pthread_join(threads[i], NULL);



       return 0;

    }



First we set everything up and connect:



    (gdb) set solib-search-path

/usr/local/cris/r59/cris-axis-linux-gnu/lib/

    (gdb) set solib-absolute-prefix /dev/null/

    (gdb) set remotetimeout 60

    (gdb) target remote 10.84.130.10:2222

    Remote debugging using 10.84.130.10:2222

    0x35557608 in ?? ()



Next we set a breakpoint in main after all threads

have been created:



    (gdb) break 20

    Breakpoint 1 at 0x80568: file hello.c, line 20.



Now send the program on its way:



    (gdb) c

    Continuing.

  



  On the host computer, I fail to see other threads,

other than the main thread. As a result, I fail to set

breakpoint on the other threads.



  I wonder what I have done wrong.



  Pls advise. Thank you for  your attention.



Regards.

Peter Choi








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