/* Helper function for thread_self in the case of user-provided stacks */

#ifndef THREAD_SELF

/* User-resetable flag: find self using process ID.
This allows LinuxThreads to work with user-level threads
(which have their own stacks); but because of the syscall
is rather slow, and won't work once we have CLONE_PID working.
Orion Sky Lawlor, olawlor@acm.org, 2001/8/7
 */
int __pthread_find_self_with_pid=0;

pthread_descr __pthread_find_self()
{
  if (__pthread_find_self_with_pid) 
  { /* Determine current thread by matching the process ID */
    int myPID=__getpid(); /* <- a syscall, and hence rather slow */
    pthread_handle h;
    h = __pthread_handles;
    while (h->h_descr->p_pid != myPID) h++;
    return h->h_descr;
  } 
  else 
    { /*Determine current thread by searching for the stack pointer */
    char * sp = CURRENT_STACK_FRAME;
    pthread_handle h;

    /* __pthread_handles[0] is the initial thread, __pthread_handles[1] is
       the manager threads handled specially in thread_self(), so start at 2 */
    h = __pthread_handles + 2;
    while (! (sp <= (char *) h->h_descr && sp >= h->h_bottom)) h++;
    return h->h_descr;
  }
}

#endif