nptl_db/td_thr_get_info.c

   1 /* Get thread information.
   2    Copyright (C) 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <stddef.h>
  22 #include <string.h>
  23 #include "thread_dbP.h"
  24
  25
  26 td_err_e
  27 td_thr_get_info (const td_thrhandle_t *th, td_thrinfo_t *infop)
  28 {
  29   td_err_e err;
  30   void *copy;
  31   psaddr_t tls, schedpolicy, schedprio, cancelhandling, tid, report_events;
  32
  33   LOG ("td_thr_get_info");
  34
  35   /* Copy the whole descriptor in once so we can access the several
  36      fields locally.  Excess copying in one go is much better than
  37      multiple ps_pdread calls.  */
  38   err = DB_GET_STRUCT (copy, th->th_ta_p, th->th_unique, pthread);
  39   if (err != TD_OK)
  40     return err;
  41
  42   err = DB_GET_FIELD_ADDRESS (tls, th->th_ta_p, th->th_unique,
  43                               pthread, specific, 0);
  44   if (err != TD_OK)
  45     return err;
  46
  47   err = DB_GET_FIELD_LOCAL (schedpolicy, th->th_ta_p, copy, pthread,
  48                             schedpolicy, 0);
  49   if (err != TD_OK)
  50     return err;
  51   err = DB_GET_FIELD_LOCAL (schedprio, th->th_ta_p, copy, pthread,
  52                             schedparam_sched_priority, 0);
  53   if (err != TD_OK)
  54     return err;
  55   err = DB_GET_FIELD_LOCAL (tid, th->th_ta_p, copy, pthread, tid, 0);
  56   if (err != TD_OK)
  57     return err;
  58   err = DB_GET_FIELD_LOCAL (cancelhandling, th->th_ta_p, copy, pthread,
  59                             cancelhandling, 0);
  60   if (err != TD_OK)
  61     return err;
  62   err = DB_GET_FIELD_LOCAL (report_events, th->th_ta_p, copy, pthread,
  63                             report_events, 0);
  64   if (err != TD_OK)
  65     return err;
  66
  67   /* Fill in information.  Clear first to provide reproducable
  68      results for the fields we do not fill in.  */
  69   memset (infop, '\0', sizeof (td_thrinfo_t));
  70
  71   infop->ti_tid = (thread_t) th->th_unique;
  72   infop->ti_tls = (char *) tls;
  73   infop->ti_pri = ((uintptr_t) schedpolicy == SCHED_OTHER
  74                    ? 0 : (uintptr_t) schedprio);
  75   infop->ti_type = TD_THR_USER;
  76
  77   if ((((int) (uintptr_t) cancelhandling) & EXITING_BITMASK) == 0)
  78     /* XXX For now there is no way to get more information.  */
  79     infop->ti_state = TD_THR_ACTIVE;
  80   else if ((((int) (uintptr_t) cancelhandling) & TERMINATED_BITMASK) == 0)
  81     infop->ti_state = TD_THR_ZOMBIE;
  82   else
  83     infop->ti_state = TD_THR_UNKNOWN;
  84
  85   /* Initialization which are the same in both cases.  */
  86   infop->ti_ta_p = th->th_ta_p;
  87   infop->ti_lid = tid == 0 ? ps_getpid (th->th_ta_p->ph) : (uintptr_t) tid;
  88   infop->ti_traceme = report_events != 0;
  89
  90   err = DB_GET_FIELD_LOCAL (infop->ti_startfunc, th->th_ta_p, copy, pthread,
  91                             start_routine, 0);
  92   if (err == TD_OK)
  93     {
  94       uint32_t idx;
  95       for (idx = 0; idx < TD_EVENTSIZE; ++idx)
  96         {
  97           psaddr_t word;
  98           err = DB_GET_FIELD_LOCAL (word, th->th_ta_p, copy, pthread,
  99                                     eventbuf_eventmask_event_bits, idx);
 100           if (err != TD_OK)
 101             break;
 102           infop->ti_events.event_bits[idx] = (uintptr_t) word;
 103         }
 104       if (err == TD_NOAPLIC)
 105         memset (&infop->ti_events.event_bits[idx], 0,
 106                 (TD_EVENTSIZE - idx) * sizeof infop->ti_events.event_bits[0]);
 107     }
 108
 109   return err;
 110 }