| 1 | /* pthread_condattr_setclock. Generic version. |
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| 2 | Copyright (C) 2002-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <pthread.h> |
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| 20 | #include <pt-internal.h> |
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| 21 | |
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| 22 | int |
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| 23 | pthread_condattr_setclock (pthread_condattr_t *attr, clockid_t clock) |
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| 24 | { |
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| 25 | /* Only a few clocks are allowed. CLOCK_REALTIME is always allowed. |
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| 26 | CLOCK_MONOTONIC only if the kernel has the necessary support. */ |
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| 27 | if (clock == CLOCK_MONOTONIC) |
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| 28 | { |
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| 29 | /* Check whether the clock is available. */ |
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| 30 | static int avail; |
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| 31 | |
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| 32 | if (avail == 0) |
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| 33 | { |
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| 34 | struct timespec ts; |
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| 35 | int res; |
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| 36 | |
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| 37 | res = clock_gettime (CLOCK_MONOTONIC, tp: &ts); |
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| 38 | avail = res < 0 ? -1 : 1; |
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| 39 | } |
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| 40 | |
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| 41 | if (avail < 0) |
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| 42 | /* Not available. */ |
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| 43 | return EINVAL; |
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| 44 | } |
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| 45 | else if (clock != CLOCK_REALTIME) |
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| 46 | return EINVAL; |
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| 47 | |
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| 48 | attr->__clock = clock; |
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| 49 | |
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| 50 | return 0; |
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| 51 | } |
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| 52 | |
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