Re: [BProc] clone support

[Nicholas H. <he...@se...>]

On Sun, 2003-08-03 at 03:13, Nicholas Henke wrote:
> 
> And the code where it bomb looks like:
>         assert(pthread_getattr_func != NULL, "floating stack pthread
> must have pthread_getattr_np");
>         pthread_attr_t attr;
>         pthread_t tid = pthread_self();
>         int rslt =
> ((pthread_getattr_func_type)pthread_getattr_func)(tid, &attr);
>         if (rslt!=0) {
>            /* what else can we do?? */
>            fatal("Can not locate current stack region!");
>         }

Just a followup, it looks like rslt == 3 here, which if I am reading
things correctly corresponds to the errno :
#define.ESRCH..  3. /* No such process */

I am inlining some of the code for pthread_getattr_np
(glibc-linuxthread/attr.c), there is a few lines that access the pid of
the thread for some scheduling stuff. Maybe the pid is not getting
masked correctly or something along those lines?

int pthread_getattr_np (pthread_t thread, pthread_attr_t *attr)
{
  pthread_handle handle = thread_handle (thread);
  pthread_descr descr;

  if (handle == NULL)
    return ENOENT;

  descr = handle->h_descr;

  attr->__detachstate = (descr->p_detached
. . .  ? PTHREAD_CREATE_DETACHED
. . .  : PTHREAD_CREATE_JOINABLE);

  attr->__schedpolicy = __sched_getscheduler (descr->p_pid);
  if (attr->__schedpolicy == -1)
    return errno;

  if (__sched_getparam (descr->p_pid,
. . . (struct sched_param *) &attr->__schedparam) != 0)
    return errno;

The rest of the code does not return anything besides 0 or 1, so I am
guessing it is the above actions that barfs it.

Much confusion ;)
Nic
-- 
Nicholas Henke
Penguin Herder & Linux Cluster System Programmer
Liniac Project - Univ. of Pennsylvania