Fix Wundef warning for __STDC_VERSION__
[glibc.git] / nptl / pthread_setschedprio.c
blobc58ba947196b82d56d15d365a47581375b1b4a57
1 /* Copyright (C) 2002-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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.
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.
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/>. */
19 #include <errno.h>
20 #include <sched.h>
21 #include <string.h>
22 #include <sched.h>
23 #include "pthreadP.h"
24 #include <lowlevellock.h>
27 int
28 pthread_setschedprio (threadid, prio)
29 pthread_t threadid;
30 int prio;
32 struct pthread *pd = (struct pthread *) threadid;
34 /* Make sure the descriptor is valid. */
35 if (INVALID_TD_P (pd))
36 /* Not a valid thread handle. */
37 return ESRCH;
39 int result = 0;
40 struct sched_param param;
41 param.sched_priority = prio;
43 lll_lock (pd->lock, LLL_PRIVATE);
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) && pd->tpp->priomax > prio)
48 param.sched_priority = pd->tpp->priomax;
50 /* Try to set the scheduler information. */
51 if (__glibc_unlikely (sched_setparam (pd->tid, &param) == -1))
52 result = errno;
53 else
55 /* We succeeded changing the kernel information. Reflect this
56 change in the thread descriptor. */
57 param.sched_priority = prio;
58 memcpy (&pd->schedparam, &param, sizeof (struct sched_param));
59 pd->flags |= ATTR_FLAG_SCHED_SET;
62 lll_unlock (pd->lock, LLL_PRIVATE);
64 return result;