linuxthreads_db/td_ta_thr_iter.c

   1 /* Iterate over a process's threads.
   2    Copyright (C) 1999, 2000 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.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 "thread_dbP.h"
  22 #include <alloca.h>
  23
  24 static int
  25 handle_descr (const td_thragent_t *ta, td_thr_iter_f *callback,
  26               void *cbdata_p, td_thr_state_e state, int ti_pri,
  27               size_t cnt, pthread_descr descr)
  28 {
  29   struct _pthread_descr_struct pds;
  30   size_t sizeof_descr = ta->sizeof_descr;
  31   td_thrhandle_t th;
  32
  33   if (ps_pdread (ta->ph, descr, &pds, sizeof_descr) != PS_OK)
  34     return TD_ERR;      /* XXX Other error value?  */
  35
  36   /* The manager thread must be handled special.  The descriptor
  37      exists but the thread only gets created when the first
  38      `pthread_create' call is issued.  A clear indication that this
  39      happened is when the p_pid field is non-zero.  */
  40   if (cnt == 1 && pds.p_pid == 0)
  41     return TD_OK;
  42
  43   /* Now test whether this thread matches the specified
  44      conditions.  */
  45
  46   /* Only if the priority level is as high or higher.  */
  47   if (pds.p_priority < ti_pri)
  48     return TD_OK;
  49
  50   /* Test the state.
  51      XXX This is incomplete.  */
  52   if (state != TD_THR_ANY_STATE)
  53     return TD_OK;
  54
  55   /* XXX For now we ignore threads which are not running anymore.
  56      The reason is that gdb tries to get the registers and fails.
  57      In future we should have a special mode of the thread library
  58      in which we keep the process around until the actual join
  59      operation happened.  */
  60   if (pds.p_exited != 0)
  61     return TD_OK;
  62
  63   /* Yep, it matches.  Call the callback function.  */
  64   th.th_ta_p = (td_thragent_t *) ta;
  65   th.th_unique = descr;
  66   if (callback (&th, cbdata_p) != 0)
  67     return TD_DBERR;
  68
  69   /* All done successfully.  */
  70   return TD_OK;
  71 }
  72
  73
  74 td_err_e
  75 td_ta_thr_iter (const td_thragent_t *ta, td_thr_iter_f *callback,
  76                 void *cbdata_p, td_thr_state_e state, int ti_pri,
  77                 sigset_t *ti_sigmask_p, unsigned int ti_user_flags)
  78 {
  79   int pthread_threads_max;
  80   struct pthread_handle_struct *phc;
  81   td_err_e result = TD_OK;
  82   int cnt;
  83 #ifdef ALL_THREADS_STOPPED
  84   int num;
  85 #else
  86 # define num 1
  87 #endif
  88
  89   LOG (__FUNCTION__);
  90
  91   /* Test whether the TA parameter is ok.  */
  92   if (! ta_ok (ta))
  93     return TD_BADTA;
  94
  95   pthread_threads_max = ta->pthread_threads_max;
  96   phc = (struct pthread_handle_struct *) alloca (sizeof (phc[0])
  97                                                  * pthread_threads_max);
  98
  99   /* First read only the main thread and manager thread information.  */
 100   if (ps_pdread (ta->ph, ta->handles, phc,
 101                  sizeof (struct pthread_handle_struct) * 2) != PS_OK)
 102     return TD_ERR;      /* XXX Other error value?  */
 103
 104   /* Now handle these descriptors.  */
 105   result = handle_descr (ta, callback, cbdata_p, state, ti_pri, 0,
 106                          phc[0].h_descr);
 107   if (result != TD_OK)
 108     return result;
 109   result = handle_descr (ta, callback, cbdata_p, state, ti_pri, 1,
 110                          phc[1].h_descr);
 111   if (result != TD_OK)
 112     return result;
 113
 114   /* Read all the descriptors.  */
 115   if (ps_pdread (ta->ph, ta->handles + 2, &phc[2],
 116                  (sizeof (struct pthread_handle_struct)
 117                   * (pthread_threads_max - 2))) != PS_OK)
 118     return TD_ERR;      /* XXX Other error value?  */
 119
 120 #ifdef ALL_THREADS_STOPPED
 121   /* Read the number of currently active threads.  */
 122   if (ps_pdread (ta->ph, ta->pthread_handles_num, &num, sizeof (int)) != PS_OK)
 123     return TD_ERR;      /* XXX Other error value?  */
 124 #endif
 125
 126   /* Now get all descriptors, one after the other.  */
 127   for (cnt = 2; cnt < pthread_threads_max && num > 0; ++cnt)
 128     if (phc[cnt].h_descr != NULL)
 129       {
 130 #ifdef ALL_THREADS_STOPPED
 131         /* First count this active thread.  */
 132         --num;
 133 #endif
 134
 135         result = handle_descr (ta, callback, cbdata_p, state, ti_pri, cnt,
 136                                phc[cnt].h_descr);
 137         if (result != TD_OK)
 138           break;
 139       }
 140
 141   return result;
 142 }