1/* Copyright (C) 2003-2019 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <assert.h>
20#include <errno.h>
21#include <futex-internal.h>
22#include <time.h>
23#include <sysdep.h>
24#include "pthreadP.h"
25
26
27int
28pthread_condattr_setclock (pthread_condattr_t *attr, clockid_t clock_id)
29{
30 /* Only a few clocks are allowed. */
31 if (clock_id != CLOCK_MONOTONIC && clock_id != CLOCK_REALTIME)
32 /* If more clocks are allowed some day the storing of the clock ID
33 in the pthread_cond_t structure needs to be adjusted. */
34 return EINVAL;
35
36 /* If we do not support waiting using CLOCK_MONOTONIC, return an error. */
37 if (clock_id == CLOCK_MONOTONIC
38 && !futex_supports_exact_relative_timeouts())
39 return ENOTSUP;
40
41 /* Make sure the value fits in the bits we reserved. */
42 assert (clock_id < (1 << COND_CLOCK_BITS));
43
44 int *valuep = &((struct pthread_condattr *) attr)->value;
45
46 *valuep = ((*valuep & ~(((1 << COND_CLOCK_BITS) - 1) << 1))
47 | (clock_id << 1));
48
49 return 0;
50}
51