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688903eb | 1 | /* Copyright (C) 2002-2018 Free Software Foundation, Inc. |
09594e7a UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. | |
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/>. */ | |
09594e7a UD |
18 | |
19 | #include <errno.h> | |
20 | #include <sched.h> | |
21 | #include <string.h> | |
22 | #include <sched.h> | |
23 | #include "pthreadP.h" | |
24 | #include <lowlevellock.h> | |
25 | ||
26 | ||
27 | int | |
9d46370c | 28 | pthread_setschedprio (pthread_t threadid, int prio) |
09594e7a UD |
29 | { |
30 | struct pthread *pd = (struct pthread *) threadid; | |
31 | ||
32 | /* Make sure the descriptor is valid. */ | |
33 | if (INVALID_TD_P (pd)) | |
34 | /* Not a valid thread handle. */ | |
35 | return ESRCH; | |
36 | ||
37 | int result = 0; | |
38 | struct sched_param param; | |
39 | param.sched_priority = prio; | |
40 | ||
f8bf15fe | 41 | /* See CREATE THREAD NOTES in nptl/pthread_create.c. */ |
e51deae7 | 42 | lll_lock (pd->lock, LLL_PRIVATE); |
09594e7a | 43 | |
f17efcb4 UD |
44 | /* If the thread should have higher priority because of some |
45 | PTHREAD_PRIO_PROTECT mutexes it holds, adjust the priority. */ | |
46 | if (__builtin_expect (pd->tpp != NULL, 0) && pd->tpp->priomax > prio) | |
47 | param.sched_priority = pd->tpp->priomax; | |
48 | ||
09594e7a | 49 | /* Try to set the scheduler information. */ |
a1ffb40e | 50 | if (__glibc_unlikely (sched_setparam (pd->tid, ¶m) == -1)) |
09594e7a UD |
51 | result = errno; |
52 | else | |
53 | { | |
54 | /* We succeeded changing the kernel information. Reflect this | |
55 | change in the thread descriptor. */ | |
f17efcb4 | 56 | param.sched_priority = prio; |
09594e7a UD |
57 | memcpy (&pd->schedparam, ¶m, sizeof (struct sched_param)); |
58 | pd->flags |= ATTR_FLAG_SCHED_SET; | |
59 | } | |
60 | ||
e51deae7 | 61 | lll_unlock (pd->lock, LLL_PRIVATE); |
09594e7a | 62 | |
09594e7a UD |
63 | return result; |
64 | } |