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33574c17 ST |
1 | /* pthread_condattr_setclock. Generic version. |
2 | Copyright (C) 2002-2018 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
ad2b41bf ST |
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. | |
33574c17 ST |
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 | |
ad2b41bf | 13 | Lesser General Public License for more details. |
33574c17 | 14 | |
ad2b41bf ST |
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/>. */ | |
33574c17 ST |
18 | |
19 | #include <pthread.h> | |
20 | #include <pt-internal.h> | |
21 | ||
22 | int | |
23 | pthread_condattr_setclock (pthread_condattr_t *attr, clockid_t clock) | |
24 | { | |
25 | /* Only a few clocks are allowed. CLOCK_REALTIME is always allowed. | |
26 | CLOCK_MONOTONIC only if the kernel has the necessary support. */ | |
27 | if (clock == CLOCK_MONOTONIC) | |
28 | { | |
29 | /* Check whether the clock is available. */ | |
30 | static int avail; | |
31 | ||
32 | if (avail == 0) | |
33 | { | |
34 | struct timespec ts; | |
35 | int res; | |
36 | ||
37 | res = clock_gettime (CLOCK_MONOTONIC, &ts); | |
38 | avail = res < 0 ? -1 : 1; | |
39 | } | |
40 | ||
41 | if (avail < 0) | |
42 | /* Not available. */ | |
43 | return EINVAL; | |
44 | } | |
45 | else if (clock != CLOCK_REALTIME) | |
46 | return EINVAL; | |
47 | ||
48 | attr->__clock = clock; | |
49 | ||
50 | return 0; | |
51 | } |