nptl_db/td_thr_get_info.c

   1 /* Get thread information.
   2    Copyright (C) 1999-2013 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, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <stddef.h>
  21 #include <string.h>
  22 #include "thread_dbP.h"
  23
  24
  25 td_err_e
  26 td_thr_get_info (const td_thrhandle_t *th, td_thrinfo_t *infop)
  27 {
  28   td_err_e err;
  29   void *copy;
  30   psaddr_t tls, schedpolicy, schedprio, cancelhandling, tid, report_events;
  31
  32   LOG ("td_thr_get_info");
  33
  34   if (th->th_unique == 0)
  35     {
  36       /* Special case for the main thread before initialization.  */
  37       copy = NULL;
  38       tls = 0;
  39       cancelhandling = 0;
  40       schedpolicy = SCHED_OTHER;
  41       schedprio = 0;
  42       tid = 0;
  43       err = DB_GET_VALUE (report_events, th->th_ta_p,
  44                           __nptl_initial_report_events, 0);
  45     }
  46   else
  47     {
  48       /* Copy the whole descriptor in once so we can access the several
  49          fields locally.  Excess copying in one go is much better than
  50          multiple ps_pdread calls.  */
  51       err = DB_GET_STRUCT (copy, th->th_ta_p, th->th_unique, pthread);
  52       if (err != TD_OK)
  53         return err;
  54
  55       err = DB_GET_FIELD_ADDRESS (tls, th->th_ta_p, th->th_unique,
  56                                   pthread, specific, 0);
  57       if (err != TD_OK)
  58         return err;
  59
  60       err = DB_GET_FIELD_LOCAL (schedpolicy, th->th_ta_p, copy, pthread,
  61                                 schedpolicy, 0);
  62       if (err != TD_OK)
  63         return err;
  64       err = DB_GET_FIELD_LOCAL (schedprio, th->th_ta_p, copy, pthread,
  65                                 schedparam_sched_priority, 0);
  66       if (err != TD_OK)
  67         return err;
  68       err = DB_GET_FIELD_LOCAL (tid, th->th_ta_p, copy, pthread, tid, 0);
  69       if (err != TD_OK)
  70         return err;
  71       err = DB_GET_FIELD_LOCAL (cancelhandling, th->th_ta_p, copy, pthread,
  72                                 cancelhandling, 0);
  73       if (err != TD_OK)
  74         return err;
  75       err = DB_GET_FIELD_LOCAL (report_events, th->th_ta_p, copy, pthread,
  76                                 report_events, 0);
  77     }
  78   if (err != TD_OK)
  79     return err;
  80
  81   /* Fill in information.  Clear first to provide reproducable
  82      results for the fields we do not fill in.  */
  83   memset (infop, '\0', sizeof (td_thrinfo_t));
  84
  85   infop->ti_tid = (thread_t) th->th_unique;
  86   infop->ti_tls = (char *) tls;
  87   infop->ti_pri = ((uintptr_t) schedpolicy == SCHED_OTHER
  88                    ? 0 : (uintptr_t) schedprio);
  89   infop->ti_type = TD_THR_USER;
  90
  91   if ((((int) (uintptr_t) cancelhandling) & EXITING_BITMASK) == 0)
  92     /* XXX For now there is no way to get more information.  */
  93     infop->ti_state = TD_THR_ACTIVE;
  94   else if ((((int) (uintptr_t) cancelhandling) & TERMINATED_BITMASK) == 0)
  95     infop->ti_state = TD_THR_ZOMBIE;
  96   else
  97     infop->ti_state = TD_THR_UNKNOWN;
  98
  99   /* Initialization which are the same in both cases.  */
 100   infop->ti_ta_p = th->th_ta_p;
 101   infop->ti_lid = tid == 0 ? ps_getpid (th->th_ta_p->ph) : (uintptr_t) tid;
 102   infop->ti_traceme = report_events != 0;
 103
 104   if (copy != NULL)
 105     err = DB_GET_FIELD_LOCAL (infop->ti_startfunc, th->th_ta_p, copy, pthread,
 106                               start_routine, 0);
 107   if (copy != NULL && err == TD_OK)
 108     {
 109       uint32_t idx;
 110       for (idx = 0; idx < TD_EVENTSIZE; ++idx)
 111         {
 112           psaddr_t word;
 113           err = DB_GET_FIELD_LOCAL (word, th->th_ta_p, copy, pthread,
 114                                     eventbuf_eventmask_event_bits, idx);
 115           if (err != TD_OK)
 116             break;
 117           infop->ti_events.event_bits[idx] = (uintptr_t) word;
 118         }
 119       if (err == TD_NOAPLIC)
 120         memset (&infop->ti_events.event_bits[idx], 0,
 121                 (TD_EVENTSIZE - idx) * sizeof infop->ti_events.event_bits[0]);
 122     }
 123
 124   return err;
 125 }