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[glibc/history.git] / nptl / pthread_setschedprio.c
blobc99f7cec076028b4dff68354939df06453c3a785
1 /* Copyright (C) 2002, 2003, 2004, 2007 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, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #include <errno.h>
21 #include <sched.h>
22 #include <string.h>
23 #include <sched.h>
24 #include "pthreadP.h"
25 #include <lowlevellock.h>
28 int
29 pthread_setschedprio (threadid, prio)
30 pthread_t threadid;
31 int prio;
33 struct pthread *pd = (struct pthread *) threadid;
35 /* Make sure the descriptor is valid. */
36 if (INVALID_TD_P (pd))
37 /* Not a valid thread handle. */
38 return ESRCH;
40 int result = 0;
41 struct sched_param param;
42 param.sched_priority = prio;
44 lll_lock (pd->lock, LLL_PRIVATE);
46 /* If the thread should have higher priority because of some
47 PTHREAD_PRIO_PROTECT mutexes it holds, adjust the priority. */
48 if (__builtin_expect (pd->tpp != NULL, 0) && pd->tpp->priomax > prio)
49 param.sched_priority = pd->tpp->priomax;
51 /* Try to set the scheduler information. */
52 if (__builtin_expect (sched_setparam (pd->tid, &param) == -1, 0))
53 result = errno;
54 else
56 /* We succeeded changing the kernel information. Reflect this
57 change in the thread descriptor. */
58 param.sched_priority = prio;
59 memcpy (&pd->schedparam, &param, sizeof (struct sched_param));
60 pd->flags |= ATTR_FLAG_SCHED_SET;
63 lll_unlock (pd->lock, LLL_PRIVATE);
65 return result;