nptl_db/td_ta_clear_event.c

   1 /* Globally disable events.
   2    Copyright (C) 1999, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@redhat.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, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include "thread_dbP.h"
  21
  22
  23 td_err_e
  24 td_ta_clear_event (ta_arg, event)
  25      const td_thragent_t *ta_arg;
  26      td_thr_events_t *event;
  27 {
  28   td_thragent_t *const ta = (td_thragent_t *) ta_arg;
  29   td_err_e err;
  30   psaddr_t eventmask = 0;
  31   void *copy = NULL;
  32
  33   LOG ("td_ta_clear_event");
  34
  35   /* Test whether the TA parameter is ok.  */
  36   if (! ta_ok (ta))
  37     return TD_BADTA;
  38
  39   /* Fetch the old event mask from the inferior and modify it in place.  */
  40   err = DB_GET_SYMBOL (eventmask, ta, __nptl_threads_events);
  41   if (err == TD_OK)
  42     err = DB_GET_STRUCT (copy, ta, eventmask, td_thr_events_t);
  43   if (err == TD_OK)
  44     {
  45       uint32_t idx;
  46       for (idx = 0; idx < TD_EVENTSIZE; ++idx)
  47         {
  48           psaddr_t word;
  49           uint32_t mask;
  50           err = DB_GET_FIELD_LOCAL (word, ta, copy,
  51                                     td_thr_events_t, event_bits, idx);
  52           if (err != TD_OK)
  53             break;
  54           mask = (uintptr_t) word;
  55           mask &= ~event->event_bits[idx];
  56           word = (psaddr_t) (uintptr_t) mask;
  57           err = DB_PUT_FIELD_LOCAL (ta, copy,
  58                                     td_thr_events_t, event_bits, idx, word);
  59           if (err != TD_OK)
  60             break;
  61         }
  62       if (err == TD_NOAPLIC)
  63         {
  64           err = TD_OK;
  65           while (idx < TD_EVENTSIZE)
  66             if (event->event_bits[idx++] != 0)
  67               {
  68                 err = TD_NOEVENT;
  69                 break;
  70               }
  71         }
  72       if (err == TD_OK)
  73         /* Now write it back to the inferior.  */
  74         err = DB_PUT_STRUCT (ta, eventmask, td_thr_events_t, copy);
  75     }
  76
  77   return err;
  78 }