linuxthreads_db/td_ta_map_id2thr.c

   1 /* Map thread ID to thread handle.
   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_id2thr (const td_thragent_t *ta, pthread_t pt, td_thrhandle_t *th)
  26 {
  27   struct pthread_handle_struct phc;
  28   struct _pthread_descr_struct pds;
  29   int pthread_threads_max;
  30
  31   LOG (__FUNCTION__);
  32
  33   /* Test whether the TA parameter is ok.  */
  34   if (! ta_ok (ta))
  35     return TD_BADTA;
  36
  37   /* Make the following expression a bit smaller.  */
  38   pthread_threads_max = ta->pthread_threads_max;
  39
  40   /* We can compute the entry in the handle array we want.  */
  41   if (ps_pdread (ta->ph, ta->handles + pt % pthread_threads_max, &phc,
  42                  sizeof (struct pthread_handle_struct)) != PS_OK)
  43     return TD_ERR;      /* XXX Other error value?  */
  44
  45   /* Test whether this entry is in use.  */
  46   if (phc.h_descr == NULL)
  47     return TD_BADTH;
  48
  49   /* Next test: get the descriptor to see whether this is not an old
  50      thread handle.  */
  51   if (ps_pdread (ta->ph, phc.h_descr, &pds,
  52                  sizeof (struct _pthread_descr_struct)) != PS_OK)
  53     return TD_ERR;      /* XXX Other error value?  */
  54
  55   if (pds.p_tid != pt)
  56     return TD_BADTH;
  57
  58   /* Create the `td_thrhandle_t' object.  */
  59   th->th_ta_p = (td_thragent_t *) ta;
  60   th->th_unique = phc.h_descr;
  61
  62   return TD_OK;
  63 }