1/* Copyright (C) 2002-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <errno.h>
19#include <sched.h>
20#include <string.h>
21#include <sched.h>
22#include "pthreadP.h"
23#include <lowlevellock.h>
24#include <shlib-compat.h>
25
26int
27__pthread_setschedprio (pthread_t threadid, int prio)
28{
29 struct pthread *pd = (struct pthread *) threadid;
30
31 /* Make sure the descriptor is valid. */
32 if (INVALID_TD_P (pd))
33 /* Not a valid thread handle. */
34 return ESRCH;
35
36 int result = 0;
37 struct sched_param param;
38 param.sched_priority = prio;
39
40 /* See CREATE THREAD NOTES in nptl/pthread_create.c. */
41 lll_lock (pd->lock, LLL_PRIVATE);
42
43 /* If the thread should have higher priority because of some
44 PTHREAD_PRIO_PROTECT mutexes it holds, adjust the priority. */
45 if (__builtin_expect (pd->tpp != NULL, 0) && pd->tpp->priomax > prio)
46 param.sched_priority = pd->tpp->priomax;
47
48 /* Try to set the scheduler information. */
49 if (__glibc_unlikely (__sched_setparam (pd->tid, &param) == -1))
50 result = errno;
51 else
52 {
53 /* We succeeded changing the kernel information. Reflect this
54 change in the thread descriptor. */
55 param.sched_priority = prio;
56 memcpy (&pd->schedparam, &param, sizeof (struct sched_param));
57 pd->flags |= ATTR_FLAG_SCHED_SET;
58 }
59
60 lll_unlock (pd->lock, LLL_PRIVATE);
61
62 return result;
63}
64versioned_symbol (libc, __pthread_setschedprio, pthread_setschedprio,
65 GLIBC_2_34);
66
67#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_3_4, GLIBC_2_34)
68compat_symbol (libpthread, __pthread_setschedprio, pthread_setschedprio,
69 GLIBC_2_3_4);
70#endif
71