libpthread/nptl_db/td_thr_clear_event.c

   1 /* Disable specific event for thread.
   2    Copyright (C) 1999,2001,2002,2003 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 (const td_thrhandle_t *th, td_thr_events_t *event)
  27 {
  28   td_err_e err;
  29   psaddr_t eventmask;
  30   void *copy = NULL;
  31
  32   LOG ("td_thr_clear_event");
  33
  34   /* Fetch the old event mask from the inferior and modify it in place.  */
  35   err = DB_GET_FIELD_ADDRESS (eventmask, th->th_ta_p,
  36                               th->th_unique, pthread, eventbuf_eventmask, 0);
  37   if (err == TD_OK)
  38     err = DB_GET_STRUCT (copy, th->th_ta_p, eventmask, td_thr_events_t);
  39   if (err == TD_OK)
  40     {
  41       uint32_t idx;
  42       for (idx = 0; idx < TD_EVENTSIZE; ++idx)
  43         {
  44           psaddr_t word;
  45           uint32_t mask;
  46           err = DB_GET_FIELD_LOCAL (word, th->th_ta_p, copy,
  47                                     td_thr_events_t, event_bits, idx);
  48           if (err != TD_OK)
  49             break;
  50           mask = (uintptr_t) word;
  51           mask &= ~event->event_bits[idx];
  52           word = (psaddr_t) (uintptr_t) mask;
  53           err = DB_PUT_FIELD_LOCAL (th->th_ta_p, copy,
  54                                     td_thr_events_t, event_bits, idx, word);
  55           if (err != TD_OK)
  56             break;
  57         }
  58       if (err == TD_NOAPLIC)
  59         {
  60           err = TD_OK;
  61           while (idx < TD_EVENTSIZE)
  62             if (event->event_bits[idx++] != 0)
  63               {
  64                 err = TD_NOEVENT;
  65                 break;
  66               }
  67         }
  68       if (err == TD_OK)
  69         /* Now write it back to the inferior.  */
  70         err = DB_PUT_STRUCT (th->th_ta_p, eventmask, td_thr_events_t, copy);
  71     }
  72
  73   return err;
  74 }