libpthread/linuxthreads.old_db/td_thr_clear_event.c

   1 /* Disable specific event for thread.
   2    Copyright (C) 1999, 2001, 2002, 2005 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.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_thr_events_t old_event;
  29   int i;
  30
  31   LOG ("td_thr_clear_event");
  32
  33   /* If the thread descriptor has not yet been constructed do not do
  34      anything.  */
  35   if (th->th_unique == NULL)
  36     return TD_OK;
  37
  38   /* Write the new value into the thread data structure.  */
  39   if (ps_pdread (th->th_ta_p->ph,
  40                  ((char *) th->th_unique
  41                   + offsetof (struct _pthread_descr_struct,
  42                               p_eventbuf.eventmask)),
  43                  &old_event, sizeof (td_thr_events_t)) != PS_OK)
  44     return TD_ERR;      /* XXX Other error value?  */
  45
  46   /* Remove the set bits in.  */
  47   for (i = 0; i < TD_EVENTSIZE; ++i)
  48     old_event.event_bits[i] &= ~event->event_bits[i];
  49
  50   /* Write the new value into the thread data structure.  */
  51   if (ps_pdwrite (th->th_ta_p->ph,
  52                   ((char *) th->th_unique
  53                    + offsetof (struct _pthread_descr_struct,
  54                                p_eventbuf.eventmask)),
  55                   &old_event, sizeof (td_thr_events_t)) != PS_OK)
  56     return TD_ERR;      /* XXX Other error value?  */
  57
  58   return TD_OK;
  59 }