Re: pthread_create, Program received signal ?, Unknown signal

[Daniel Jacobowitz <drow at mvista dot com>]

On Mon, Sep 01, 2003 at 06:42:29PM +0530, Balarama Krishna wrote:
> Hi,
> 
> I am trying to debug a multi-threaded application on arm-linux  target
> from i386-linux host using GDB-5.3. 

You seem to be using glibc 2.3.x.  Am I right?

If so, try CVS gdb instead.  A change in the definition of SIGRTMIN
causes this symptom.

> 
> I am using gcc(3.2.3) and using the same set of shared libraries (came
> with gcc(3.2.3)on the target also in order to run gdbserver.
> 
> Below is my sample application 
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> 1 #include <stdio.h>
>       2 #include <pthread.h>
>       3
>       4 void * call_back(void *);
>       5 int main()
>       6 {
>       7         int count=0;
>       8         pthread_t thread_id;
>       9         if ( pthread_create(&thread_id, NULL, call_back, NULL)
> != 0){
>      10                 perror("pthread_create() Failed");
>      11                 return 0;
>      12         }
>      13         while(1){
>      14                 count++;
>      15                 sleep(1);
>      16                 printf("Main Thread Count (%d) \n", count);
>      17         }
>      18 }
>      19 void    * call_back(void *arg)
>      20 {
>      21         int count=0;
>      22         while(1){
>      23                 count++;
>      24                 sleep(3);
>      25                 printf("Thread Loop count (%d) \n", count);
>      26         }
>      27 }
> 
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> 
> Screen shot on the HOST side
> 
> /%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%/
> GNU gdb 5.3
> Copyright 2002 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you
> are
> welcome to change it and/or distribute copies of it under certain
> conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for
> details.
> This GDB was configured as "--host=i686-pc-linux-gnu
> --target=arm-linux".
> (gdb) et solib-absolute-prefix /dev/null
> Undefined command: "et".  Try "help".
> (gdb) set solib-absolute-prefix /dev/null
> (gdb) set solib-search-path /home/balaram/links_to_lib_dir
> (gdb) file threads
> Reading symbols from threads...done.
> (gdb) target remote 107.108.3.197:2020
> Remote debugging using 107.108.3.197:2020
> 0x40002560 in ?? ()
> (gdb) break 9
> Breakpoint 1 at 0x84d0: file threads.c, line 9.
> (gdb) cont
> Continuing.
>  
> Breakpoint 1, main () at threads.c:9
> 9               if ( pthread_create(&thread_id, NULL, call_back, NULL)
> != 0){
> (gdb) n
>  
> Program received signal ?, Unknown signal.
> 0x4005b3a4 in ?? ()
> (gdb)
> /%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%/
> 
> 
> On the Target Side, the child thread got created and this is the
> following screen shot
> 
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> ./gdbserver 107.108.3.197:2020 ./threads
> Process ./threads created; pid = 189
> Remote debugging from host 107.108.3.145
> Thread Loop count (1)
> Thread Loop count (2)
> Thread Loop count (3)
> Thread Loop count (4)
> Thread Loop count (5)
> Thread Loop count (6)
> Thread Loop count (7)
> Thread Loop count (8)
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> 
> 
> Points to be clarified
> ----------------------
> 1. What happened to debug messages from Main thread on the target?
> 2. How to resolve the error messgae "Program received signal ?, Unknown
> signal" came on the Host Side.  
> 
> Am I missing anything out in this case?
> 
> 
> Thanks and Regards,
> Balaram.
> 
> 
> 
> 
> 

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer