linuxthreads_db/td_thr_clear_event.c

   1 /* Disable specific event for thread.
   2    Copyright (C) 1999, 2001, 2002 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <stddef.h>
  22
  23 #include "thread_dbP.h"
  24
  25
  26 td_err_e
  27 td_thr_clear_event (th, event)
  28      const td_thrhandle_t *th;
  29      td_thr_events_t *event;
  30 {
  31   td_thr_events_t old_event;
  32   int i;
  33
  34   LOG ("td_thr_clear_event");
  35
  36   /* If the thread descriptor has not yet been constructed do not do
  37      anything.  */
  38   if (th->th_unique == NULL)
  39     return TD_OK;
  40
  41   /* Write the new value into the thread data structure.  */
  42   if (ps_pdread (th->th_ta_p->ph,
  43                  ((char *) th->th_unique
  44                   + offsetof (struct _pthread_descr_struct,
  45                               p_eventbuf.eventmask)),
  46                  &old_event, sizeof (td_thrhandle_t)) != PS_OK)
  47     return TD_ERR;      /* XXX Other error value?  */
  48
  49   /* Remove the set bits in.  */
  50   for (i = 0; i < TD_EVENTSIZE; ++i)
  51     old_event.event_bits[i] &= ~event->event_bits[i];
  52
  53   /* Write the new value into the thread data structure.  */
  54   if (ps_pdwrite (th->th_ta_p->ph,
  55                   ((char *) th->th_unique
  56                    + offsetof (struct _pthread_descr_struct,
  57                                p_eventbuf.eventmask)),
  58                   &old_event, sizeof (td_thrhandle_t)) != PS_OK)
  59     return TD_ERR;      /* XXX Other error value?  */
  60
  61   return TD_OK;
  62 }