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[NEED HELP] Problem to multithread remote debugging with GDBserver
- From: Peter Choi <peter_tkchoi at yahoo dot com>
- To: gdb at sources dot redhat dot com
- Date: Thu, 27 Oct 2005 03:26:55 -0700 (PDT)
- Subject: [NEED HELP] Problem to multithread remote debugging with GDBserver
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 (FC1 actually). 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 side, I fail to see other
threads,
other than the main thread. As a result, I fail to set
breakpoint on the other threads.
I have downloaded source code of GDB6.3 and compiled
my own GDB & GDBSERVER. But it still can't see the
other threads on the host side.
SO, I wonder what I have done wrong. What option do
I need to specify to compile GDB/GDBSERVER in order to
support multithread remote debugging ?????
Pls HELP. Thank you for your attention.
Regards.
Peter Choi
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