1/* Copyright (C) 2002-2021 Free Software Foundation, Inc.
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
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include <sched.h>
21#include <string.h>
22#include "pthreadP.h"
23#include <lowlevellock.h>
24
25
26int
27__pthread_setschedparam (pthread_t threadid, int policy,
28 const struct sched_param *param)
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
39 /* See CREATE THREAD NOTES in nptl/pthread_create.c. */
40 lll_lock (pd->lock, LLL_PRIVATE);
41
42 struct sched_param p;
43 const struct sched_param *orig_param = param;
44
45 /* If the thread should have higher priority because of some
46 PTHREAD_PRIO_PROTECT mutexes it holds, adjust the priority. */
47 if (__builtin_expect (pd->tpp != NULL, 0)
48 && pd->tpp->priomax > param->sched_priority)
49 {
50 p = *param;
51 p.sched_priority = pd->tpp->priomax;
52 param = &p;
53 }
54
55 /* Try to set the scheduler information. */
56 if (__builtin_expect (__sched_setscheduler (pd->tid, policy,
57 param) == -1, 0))
58 result = errno;
59 else
60 {
61 /* We succeeded changing the kernel information. Reflect this
62 change in the thread descriptor. */
63 pd->schedpolicy = policy;
64 memcpy (&pd->schedparam, orig_param, sizeof (struct sched_param));
65 pd->flags |= ATTR_FLAG_SCHED_SET | ATTR_FLAG_POLICY_SET;
66 }
67
68 lll_unlock (pd->lock, LLL_PRIVATE);
69
70 return result;
71}
72strong_alias (__pthread_setschedparam, pthread_setschedparam)
73