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bfff8b1b | 1 | /* Copyright (C) 2003-2017 Free Software Foundation, Inc. |
86a9ee5e UD |
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 | |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
86a9ee5e | 18 | |
73f7c32c | 19 | #include <assert.h> |
86a9ee5e | 20 | #include <errno.h> |
ed19993b | 21 | #include <futex-internal.h> |
86a9ee5e UD |
22 | #include <time.h> |
23 | #include <sysdep.h> | |
24 | #include "pthreadP.h" | |
86a9ee5e UD |
25 | |
26 | ||
27 | int | |
9dd346ff | 28 | pthread_condattr_setclock (pthread_condattr_t *attr, clockid_t clock_id) |
86a9ee5e | 29 | { |
93a78ac4 JM |
30 | /* Only a few clocks are allowed. */ |
31 | if (clock_id != CLOCK_MONOTONIC && clock_id != CLOCK_REALTIME) | |
73f7c32c UD |
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. */ | |
86a9ee5e UD |
34 | return EINVAL; |
35 | ||
ed19993b TR |
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 | ||
73f7c32c | 41 | /* Make sure the value fits in the bits we reserved. */ |
ed19993b | 42 | assert (clock_id < (1 << COND_CLOCK_BITS)); |
73f7c32c | 43 | |
86a9ee5e UD |
44 | int *valuep = &((struct pthread_condattr *) attr)->value; |
45 | ||
ed19993b | 46 | *valuep = ((*valuep & ~(((1 << COND_CLOCK_BITS) - 1) << 1)) |
ee5d5755 | 47 | | (clock_id << 1)); |
86a9ee5e UD |
48 | |
49 | return 0; | |
50 | } |