linuxthreads_db/td_ta_map_lwp2thr.c

   1 /* Which thread is running on an lwp?
   2    Copyright (C) 1999 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 Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    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    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "thread_dbP.h"
  22
  23
  24 td_err_e
  25 td_ta_map_lwp2thr (const td_thragent_t *ta, lwpid_t lwpid, td_thrhandle_t *th)
  26 {
  27   struct pthread_handle_struct *handles = ta->handles;
  28   int pthread_threads_max = ta->pthread_threads_max;
  29   size_t cnt;
  30
  31   LOG (__FUNCTION__);
  32
  33   /* Get the entries one after the other and find out whether the ID
  34      matches.  */
  35   for (cnt = 0; cnt < pthread_threads_max; ++cnt, ++handles)
  36     {
  37       struct pthread_handle_struct phc;
  38       struct _pthread_descr_struct pds;
  39
  40       if (ps_pdread (ta->ph, handles, &phc,
  41                      sizeof (struct pthread_handle_struct)) != PS_OK)
  42         return TD_ERR;  /* XXX Other error value?  */
  43
  44       if (phc.h_descr != NULL)
  45         {
  46           if (ps_pdread (ta->ph, phc.h_descr, &pds,
  47                          sizeof (struct _pthread_descr_struct)) != PS_OK)
  48             return TD_ERR;      /* XXX Other error value?  */
  49
  50           if (pds.p_pid == lwpid)
  51             {
  52               /* Found it.  Now fill in the `td_thrhandle_t' object.  */
  53               th->th_ta_p = (td_thragent_t *) ta;
  54               th->th_unique = phc.h_descr;
  55
  56               return TD_OK;
  57             }
  58         }
  59     }
  60
  61   return TD_NOLWP;
  62 }