1 /* Copyright (C) 2002, 2003, 2004, 2006, 2007 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 <http://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
26 int
27 attribute_protected
__pthread_setschedparam(pthread_t threadid,int policy,const struct sched_param * param)28 __pthread_setschedparam (
29 pthread_t threadid,
30 int policy,
31 const struct sched_param *param)
32 {
33 struct pthread *pd = (struct pthread *) threadid;
34
35 /* Make sure the descriptor is valid. */
36 if (INVALID_TD_P (pd))
37 /* Not a valid thread handle. */
38 return ESRCH;
39
40 int result = 0;
41
42 lll_lock (pd->lock, LLL_PRIVATE);
43
44 struct sched_param p;
45 const struct sched_param *orig_param = param;
46
47 /* If the thread should have higher priority because of some
48 PTHREAD_PRIO_PROTECT mutexes it holds, adjust the priority. */
49 if (__builtin_expect (pd->tpp != NULL, 0)
50 && pd->tpp->priomax > param->sched_priority)
51 {
52 p = *param;
53 p.sched_priority = pd->tpp->priomax;
54 param = &p;
55 }
56
57 /* Try to set the scheduler information. */
58 if (__builtin_expect (__sched_setscheduler (pd->tid, policy,
59 param) == -1, 0))
60 result = errno;
61 else
62 {
63 /* We succeeded changing the kernel information. Reflect this
64 change in the thread descriptor. */
65 pd->schedpolicy = policy;
66 memcpy (&pd->schedparam, orig_param, sizeof (struct sched_param));
67 pd->flags |= ATTR_FLAG_SCHED_SET | ATTR_FLAG_POLICY_SET;
68 }
69
70 lll_unlock (pd->lock, LLL_PRIVATE);
71
72 return result;
73 }
74 strong_alias (__pthread_setschedparam, pthread_setschedparam)
75