nptl_db/td_thr_clear_event.c

   1 /* Disable specific event for thread.
   2    Copyright (C) 1999-2021 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    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <stddef.h>
  21 #include <stdint.h>
  22
  23 #include "thread_dbP.h"
  24
  25
  26 td_err_e
  27 td_thr_clear_event (const td_thrhandle_t *th, td_thr_events_t *event)
  28 {
  29   td_err_e err;
  30   psaddr_t eventmask;
  31   void *copy;
  32
  33   LOG ("td_thr_clear_event");
  34
  35   /* Fetch the old event mask from the inferior and modify it in place.  */
  36   err = DB_GET_FIELD_ADDRESS (eventmask, th->th_ta_p,
  37                               th->th_unique, pthread, eventbuf_eventmask, 0);
  38   if (err == TD_OK)
  39     err = DB_GET_STRUCT (copy, th->th_ta_p, eventmask, td_thr_events_t);
  40   if (err == TD_OK)
  41     {
  42       uint32_t idx;
  43       for (idx = 0; idx < TD_EVENTSIZE; ++idx)
  44         {
  45           psaddr_t word;
  46           uint32_t mask;
  47           err = DB_GET_FIELD_LOCAL (word, th->th_ta_p, copy,
  48                                     td_thr_events_t, event_bits, idx);
  49           if (err != TD_OK)
  50             break;
  51           mask = (uintptr_t) word;
  52           mask &= ~event->event_bits[idx];
  53           word = (psaddr_t) (uintptr_t) mask;
  54           err = DB_PUT_FIELD_LOCAL (th->th_ta_p, copy,
  55                                     td_thr_events_t, event_bits, idx, word);
  56           if (err != TD_OK)
  57             break;
  58         }
  59       if (err == TD_NOAPLIC)
  60         {
  61           err = TD_OK;
  62           while (idx < TD_EVENTSIZE)
  63             if (event->event_bits[idx++] != 0)
  64               {
  65                 err = TD_NOEVENT;
  66                 break;
  67               }
  68         }
  69       if (err == TD_OK)
  70         /* Now write it back to the inferior.  */
  71         err = DB_PUT_STRUCT (th->th_ta_p, eventmask, td_thr_events_t, copy);
  72     }
  73
  74   return err;
  75 }