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   int pthread_threads_max = ta->pthread_threads_max;
  28   size_t sizeof_descr = ta->sizeof_descr;
  29   struct pthread_handle_struct phc[pthread_threads_max];
  30   size_t cnt;
  31 #ifdef ALL_THREADS_STOPPED
  32   int num;
  33 #else
  34 # define num 1
  35 #endif
  36
  37   LOG (__FUNCTION__);
  38
  39   /* Test whether the TA parameter is ok.  */
  40   if (! ta_ok (ta))
  41     return TD_BADTA;
  42
  43   /* Read all the descriptors.  */
  44   if (ps_pdread (ta->ph, ta->handles, phc,
  45                  sizeof (struct pthread_handle_struct) * pthread_threads_max)
  46       != PS_OK)
  47     return TD_ERR;      /* XXX Other error value?  */
  48
  49 #ifdef ALL_THREADS_STOPPED
  50   /* Read the number of currently active threads.  */
  51   if (ps_pdread (ta->ph, ta->pthread_handles_num, &num, sizeof (int)) != PS_OK)
  52     return TD_ERR;      /* XXX Other error value?  */
  53 #endif
  54
  55   /* Get the entries one after the other and find out whether the ID
  56      matches.  */
  57   for (cnt = 0; cnt < pthread_threads_max && num > 0; ++cnt)
  58     if (phc[cnt].h_descr != NULL)
  59       {
  60         struct _pthread_descr_struct pds;
  61
  62 #ifdef ALL_THREADS_STOPPED
  63         /* First count this active thread.  */
  64         --num;
  65 #endif
  66
  67         if (ps_pdread (ta->ph, phc[cnt].h_descr, &pds, sizeof_descr) != PS_OK)
  68           return TD_ERR;        /* XXX Other error value?  */
  69
  70         if ((pds.p_pid ?: ps_getpid (ta->ph)) == lwpid)
  71           {
  72             /* Found it.  Now fill in the `td_thrhandle_t' object.  */
  73             th->th_ta_p = (td_thragent_t *) ta;
  74             th->th_unique = phc[cnt].h_descr;
  75
  76             return TD_OK;
  77           }
  78     }
  79
  80   return TD_NOLWP;
  81 }