/* Disable specific event for thread.

   Copyright (C) 1999-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <stddef.h>

#include <stdint.h>

#include "thread_dbP.h"

td_err_e

td_thr_clear_event (const td_thrhandle_t *th, td_thr_events_t *event)

{

  td_err_e err;

  psaddr_t eventmask;

  void *copy;

  LOG ("td_thr_clear_event");

  /* Fetch the old event mask from the inferior and modify it in place.  */

  err = DB_GET_FIELD_ADDRESS (eventmask, th->th_ta_p,

			      th->th_unique, pthread, eventbuf_eventmask, 0);

  if (err == TD_OK)

    err = DB_GET_STRUCT (copy, th->th_ta_p, eventmask, td_thr_events_t);

  if (err == TD_OK)

    {

      uint32_t idx;

      for (idx = 0; idx < TD_EVENTSIZE; ++idx)

	{

	  psaddr_t word;

	  uint32_t mask;

	  err = DB_GET_FIELD_LOCAL (word, th->th_ta_p, copy,

				    td_thr_events_t, event_bits, idx);

	  if (err != TD_OK)

	    break;

	  mask = (uintptr_t) word;

	  mask &= ~event->event_bits[idx];

	  word = (psaddr_t) (uintptr_t) mask;

	  err = DB_PUT_FIELD_LOCAL (th->th_ta_p, copy,

				    td_thr_events_t, event_bits, idx, word);

	  if (err != TD_OK)

	    break;

	}

      if (err == TD_NOAPLIC)

	{

	  err = TD_OK;

	  while (idx < TD_EVENTSIZE)

	    if (event->event_bits[idx++] != 0)

	      {

		err = TD_NOEVENT;

		break;

	      }

	}

      if (err == TD_OK)

	/* Now write it back to the inferior.  */

	err = DB_PUT_STRUCT (th->th_ta_p, eventmask, td_thr_events_t, copy);

    }

  return err;

}