nptl_db/td_thr_clear_event.c

   1 /* Disable specific event for thread.
   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 <stddef.h>
  21
  22 #include "thread_dbP.h"
  23
  24
  25 td_err_e
  26 td_thr_clear_event (th, event)
  27      const td_thrhandle_t *th;
  28      td_thr_events_t *event;
  29 {
  30   td_err_e err;
  31   psaddr_t eventmask;
  32   void *copy;
  33
  34   LOG ("td_thr_clear_event");
  35
  36   /* Fetch the old event mask from the inferior and modify it in place.  */
  37   err = DB_GET_FIELD_ADDRESS (eventmask, th->th_ta_p,
  38                               th->th_unique, pthread, eventbuf_eventmask, 0);
  39   if (err == TD_OK)
  40     err = DB_GET_STRUCT (copy, th->th_ta_p, eventmask, td_thr_events_t);
  41   if (err == TD_OK)
  42     {
  43       uint32_t idx;
  44       for (idx = 0; idx < TD_EVENTSIZE; ++idx)
  45         {
  46           psaddr_t word;
  47           uint32_t mask;
  48           err = DB_GET_FIELD_LOCAL (word, th->th_ta_p, copy,
  49                                     td_thr_events_t, event_bits, idx);
  50           if (err != TD_OK)
  51             break;
  52           mask = (uintptr_t) word;
  53           mask &= ~event->event_bits[idx];
  54           word = (psaddr_t) (uintptr_t) mask;
  55           err = DB_PUT_FIELD_LOCAL (th->th_ta_p, copy,
  56                                     td_thr_events_t, event_bits, idx, word);
  57           if (err != TD_OK)
  58             break;
  59         }
  60       if (err == TD_NOAPLIC)
  61         {
  62           err = TD_OK;
  63           while (idx < TD_EVENTSIZE)
  64             if (event->event_bits[idx++] != 0)
  65               {
  66                 err = TD_NOEVENT;
  67                 break;
  68               }
  69         }
  70       if (err == TD_OK)
  71         /* Now write it back to the inferior.  */
  72         err = DB_PUT_STRUCT (th->th_ta_p, eventmask, td_thr_events_t, copy);
  73     }
  74
  75   return err;
  76 }