nptl_db/td_ta_clear_event.c

   1 /* Globally disable events.
   2    Copyright (C) 1999-2013 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 <stdint.h>
  21 #include "thread_dbP.h"
  22
  23
  24 td_err_e
  25 td_ta_clear_event (ta_arg, event)
  26      const td_thragent_t *ta_arg;
  27      td_thr_events_t *event;
  28 {
  29   td_thragent_t *const ta = (td_thragent_t *) ta_arg;
  30   td_err_e err;
  31   psaddr_t eventmask = 0;
  32   void *copy = NULL;
  33
  34   LOG ("td_ta_clear_event");
  35
  36   /* Test whether the TA parameter is ok.  */
  37   if (! ta_ok (ta))
  38     return TD_BADTA;
  39
  40   /* Fetch the old event mask from the inferior and modify it in place.  */
  41   err = DB_GET_SYMBOL (eventmask, ta, __nptl_threads_events);
  42   if (err == TD_OK)
  43     err = DB_GET_STRUCT (copy, ta, eventmask, td_thr_events_t);
  44   if (err == TD_OK)
  45     {
  46       uint32_t idx;
  47       for (idx = 0; idx < TD_EVENTSIZE; ++idx)
  48         {
  49           psaddr_t word;
  50           uint32_t mask;
  51           err = DB_GET_FIELD_LOCAL (word, ta, copy,
  52                                     td_thr_events_t, event_bits, idx);
  53           if (err != TD_OK)
  54             break;
  55           mask = (uintptr_t) word;
  56           mask &= ~event->event_bits[idx];
  57           word = (psaddr_t) (uintptr_t) mask;
  58           err = DB_PUT_FIELD_LOCAL (ta, copy,
  59                                     td_thr_events_t, event_bits, idx, word);
  60           if (err != TD_OK)
  61             break;
  62         }
  63       if (err == TD_NOAPLIC)
  64         {
  65           err = TD_OK;
  66           while (idx < TD_EVENTSIZE)
  67             if (event->event_bits[idx++] != 0)
  68               {
  69                 err = TD_NOEVENT;
  70                 break;
  71               }
  72         }
  73       if (err == TD_OK)
  74         /* Now write it back to the inferior.  */
  75         err = DB_PUT_STRUCT (ta, eventmask, td_thr_events_t, copy);
  76     }
  77
  78   return err;
  79 }