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glibc  2.9
Functions
td_ta_thr_iter.c File Reference
#include "thread_dbP.h"

Go to the source code of this file.

Functions

static td_err_e iterate_thread_list (td_thragent_t *ta, td_thr_iter_f *callback, void *cbdata_p, td_thr_state_e state, int ti_pri, psaddr_t head, bool fake_empty, pid_t match_pid)
td_err_e td_ta_thr_iter (const td_thragent_t *ta_arg, td_thr_iter_f *callback, void *cbdata_p, td_thr_state_e state, int ti_pri, sigset_t *ti_sigmask_p, unsigned int ti_user_flags)

Function Documentation

static td_err_e iterate_thread_list ( td_thragent_t *  ta,
td_thr_iter_f callback,
void *  cbdata_p,
td_thr_state_e  state,
int  ti_pri,
psaddr_t  head,
bool  fake_empty,
pid_t  match_pid 
) [static]

Definition at line 26 of file td_ta_thr_iter.c.

{
  td_err_e err;
  psaddr_t next, ofs;
  void *copy;

  /* Test the state.
     XXX This is incomplete.  Normally this test should be in the loop.  */
  if (state != TD_THR_ANY_STATE)
    return TD_OK;

  err = DB_GET_FIELD (next, ta, head, list_t, next, 0);
  if (err != TD_OK)
    return err;

  if (next == 0 && fake_empty)
    {
      /* __pthread_initialize_minimal has not run.  There is just the main
        thread to return.  We cannot rely on its thread register.  They
        sometimes contain garbage that would confuse us, left by the
        kernel at exec.  So if it looks like initialization is incomplete,
        we only fake a special descriptor for the initial thread.  */
      td_thrhandle_t th = { ta, 0 };
      return callback (&th, cbdata_p) != 0 ? TD_DBERR : TD_OK;
    }

  /* Cache the offset from struct pthread to its list_t member.  */
  err = DB_GET_FIELD_ADDRESS (ofs, ta, 0, pthread, list, 0);
  if (err != TD_OK)
    return err;

  if (ta->ta_sizeof_pthread == 0)
    {
      err = _td_check_sizeof (ta, &ta->ta_sizeof_pthread, SYM_SIZEOF_pthread);
      if (err != TD_OK)
       return err;
    }
  copy = __alloca (ta->ta_sizeof_pthread);

  while (next != head)
    {
      psaddr_t addr, schedpolicy, schedprio;

      addr = next - (ofs - (psaddr_t) 0);
      if (next == 0 || addr == 0) /* Sanity check.  */
       return TD_DBERR;

      /* Copy the whole descriptor in once so we can access the several
        fields locally.  Excess copying in one go is much better than
        multiple ps_pdread calls.  */
      if (ps_pdread (ta->ph, addr, copy, ta->ta_sizeof_pthread) != PS_OK)
       return TD_ERR;

      /* Verify that this thread's pid field matches the child PID.
        If its pid field is negative, it's about to do a fork or it
        is the sole thread in a fork child.  */
      psaddr_t pid;
      err = DB_GET_FIELD_LOCAL (pid, ta, copy, pthread, pid, 0);
      if (err == TD_OK && (pid_t) (uintptr_t) pid < 0)
       {
         if (-(pid_t) (uintptr_t) pid == match_pid)
           /* It is about to do a fork, but is really still the parent PID.  */
           pid = (psaddr_t) (uintptr_t) match_pid;
         else
           /* It must be a fork child, whose new PID is in the tid field.  */
           err = DB_GET_FIELD_LOCAL (pid, ta, copy, pthread, tid, 0);
       }
      if (err != TD_OK)
       break;

      if ((pid_t) (uintptr_t) pid == match_pid)
       {
         err = DB_GET_FIELD_LOCAL (schedpolicy, ta, copy, pthread,
                                schedpolicy, 0);
         if (err != TD_OK)
           break;
         err = DB_GET_FIELD_LOCAL (schedprio, ta, copy, pthread,
                                schedparam_sched_priority, 0);
         if (err != TD_OK)
           break;

         /* Now test whether this thread matches the specified conditions.  */

         /* Only if the priority level is as high or higher.  */
         int descr_pri = ((uintptr_t) schedpolicy == SCHED_OTHER
                        ? 0 : (uintptr_t) schedprio);
         if (descr_pri >= ti_pri)
           {
             /* Yep, it matches.  Call the callback function.  */
             td_thrhandle_t th;
             th.th_ta_p = (td_thragent_t *) ta;
             th.th_unique = addr;
             if (callback (&th, cbdata_p) != 0)
              return TD_DBERR;
           }
       }

      /* Get the pointer to the next element.  */
      err = DB_GET_FIELD_LOCAL (next, ta, copy + (ofs - (psaddr_t) 0), list_t,
                            next, 0);
      if (err != TD_OK)
       break;
    }

  return err;
}

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td_err_e td_ta_thr_iter ( const td_thragent_t *  ta_arg,
td_thr_iter_f callback,
void *  cbdata_p,
td_thr_state_e  state,
int  ti_pri,
sigset_t ti_sigmask_p,
unsigned int  ti_user_flags 
)

Definition at line 137 of file td_ta_thr_iter.c.

{
  td_thragent_t *const ta = (td_thragent_t *) ta_arg;
  td_err_e err;
  psaddr_t list = 0;

  LOG ("td_ta_thr_iter");

  /* Test whether the TA parameter is ok.  */
  if (! ta_ok (ta))
    return TD_BADTA;

  /* The thread library keeps two lists for the running threads.  One
     list contains the thread which are using user-provided stacks
     (this includes the main thread) and the other includes the
     threads for which the thread library allocated the stacks.  We
     have to iterate over both lists separately.  We start with the
     list of threads with user-defined stacks.  */

  pid_t pid = ps_getpid (ta->ph);
  err = DB_GET_SYMBOL (list, ta, __stack_user);
  if (err == TD_OK)
    err = iterate_thread_list (ta, callback, cbdata_p, state, ti_pri,
                            list, true, pid);

  /* And the threads with stacks allocated by the implementation.  */
  if (err == TD_OK)
    err = DB_GET_SYMBOL (list, ta, stack_used);
  if (err == TD_OK)
    err = iterate_thread_list (ta, callback, cbdata_p, state, ti_pri,
                            list, false, pid);

  return err;
}

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