linuxthreads_db/td_ta_map_id2thr.c

   1 /* Map thread ID to thread handle.
   2    Copyright (C) 1999, 2001, 2002 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 <linuxthreads/internals.h>
  23
  24
  25 td_err_e
  26 td_ta_map_id2thr (const td_thragent_t *ta, pthread_t pt, td_thrhandle_t *th)
  27 {
  28   struct pthread_handle_struct phc;
  29   struct _pthread_descr_struct pds;
  30   int pthread_threads_max;
  31
  32   LOG ("td_ta_map_id2thr");
  33
  34   /* Test whether the TA parameter is ok.  */
  35   if (! ta_ok (ta))
  36     return TD_BADTA;
  37
  38   /* Make the following expression a bit smaller.  */
  39   pthread_threads_max = ta->pthread_threads_max;
  40
  41   /* We can compute the entry in the handle array we want.  */
  42   if (ps_pdread (ta->ph, ta->handles + pt % pthread_threads_max, &phc,
  43                  sizeof (struct pthread_handle_struct)) != PS_OK)
  44     return TD_ERR;      /* XXX Other error value?  */
  45
  46   /* Test whether this entry is in use.  */
  47   if (phc.h_descr == NULL)
  48     {
  49       if (pt % pthread_threads_max == 0)
  50         {
  51           /* The initial thread always exists but the thread library
  52              might not yet be initialized.  */
  53           th->th_ta_p = (td_thragent_t *) ta;
  54           th->th_unique = NULL;
  55
  56           return TD_OK;
  57         }
  58
  59       return TD_BADTH;
  60     }
  61
  62   /* Next test: get the descriptor to see whether this is not an old
  63      thread handle.  */
  64   if (ps_pdread (ta->ph, phc.h_descr, &pds,
  65                  sizeof (struct _pthread_descr_struct)) != PS_OK)
  66     return TD_ERR;      /* XXX Other error value?  */
  67
  68   if (pds.p_tid != pt)
  69     return TD_BADTH;
  70
  71   if (pds.p_terminated != 0)
  72     return TD_NOTHR;
  73
  74   /* Create the `td_thrhandle_t' object.  */
  75   th->th_ta_p = (td_thragent_t *) ta;
  76   th->th_unique = phc.h_descr;
  77
  78   return TD_OK;
  79 }