GDB/thread debugging broken

10 Jun 2004

      I am not able to debug threaded programs as I expect.  The following
program illustrates:

<begin>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <unistd.h>

static int die=0;

void intHandler(int sig) { die = 1; }

void *troutine( void *arg ) {
    for(;;) {
	printf("troutine\n");
	sleep(1);
	if (die) return 0;
    }
}

int main()
{
    signal( SIGINT, intHandler );

    pthread_t thread;
    pthread_create( &thread, 0, troutine, 0 );

    pthread_join( thread, 0 );
    printf("exiting\n");

    return 0;
}
<end>

After compiling with:

gcc -g  -lpthread  pt_tst.c   -o pt_tst

I run gdb and send the following commands:

gdb ./pt_tst
(gdb) b main
(gdb) r
(gdb) b troutine
(gdb) c

On the last continue gdb tells me this:

(gdb) c
Continuing.
Couldn't get registers: No such process.

If I run gdb with LD_ASSUME_KERNEL=2.4.21 things seem to work properly. 
Is this a known issue?

-K

GDB/thread debugging broken

Kelly Burkhart