nptl_db/td_thr_event_enable.c

   1 /* Enable event process-wide.
   2    Copyright (C) 1999-2017 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 "thread_dbP.h"
  21
  22
  23 td_err_e
  24 td_thr_event_enable (const td_thrhandle_t *th, int onoff)
  25 {
  26   LOG ("td_thr_event_enable");
  27
  28   if (th->th_unique != 0)
  29     {
  30       /* Write the new value into the thread data structure.  */
  31       td_err_e err = DB_PUT_FIELD (th->th_ta_p, th->th_unique, pthread,
  32                                    report_events, 0,
  33                                    (psaddr_t) 0 + (onoff != 0));
  34       if (err != TD_OK)
  35         return err;
  36
  37       /* Just in case we are in the window between initializing __stack_user
  38          and copying from __nptl_initial_report_events, we set it too.
  39          It doesn't hurt to do this for non-initial threads, since it
  40          won't be consulted again anyway.  It would take another fetch
  41          to get the tid and determine this isn't the initial thread,
  42          so just do it always.  */
  43     }
  44
  45   /* We are faking it for the initial thread before its thread
  46      descriptor is set up.  */
  47   return DB_PUT_VALUE (th->th_ta_p, __nptl_initial_report_events, 0,
  48                        (psaddr_t) 0 + (onoff != 0));
  49 }