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/* Copyright (C) 2003-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
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 <assert.h>
#include <errno.h>
#include <futex-internal.h>
#include <time.h>
#include <sysdep.h>
#include "pthreadP.h"
int
pthread_condattr_setclock (pthread_condattr_t *attr, clockid_t clock_id)
{
/* Only a few clocks are allowed. */
if (clock_id != CLOCK_MONOTONIC && clock_id != CLOCK_REALTIME)
/* If more clocks are allowed some day the storing of the clock ID
in the pthread_cond_t structure needs to be adjusted. */
return EINVAL;
/* If we do not support waiting using CLOCK_MONOTONIC, return an error. */
if (clock_id == CLOCK_MONOTONIC
&& !futex_supports_exact_relative_timeouts())
return ENOTSUP;
/* Make sure the value fits in the bits we reserved. */
assert (clock_id < (1 << COND_CLOCK_BITS));
int *valuep = &((struct pthread_condattr *) attr)->value;
*valuep = ((*valuep & ~(((1 << COND_CLOCK_BITS) - 1) << 1))
| (clock_id << 1));
return 0;
}
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