Update.
[glibc.git] / nptl / pthread_getschedparam.c
blob434d8677799e7f3fc6f55ba6abe376ccdf6dbedb
1 /* Copyright (C) 2002, 2003, 2004 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 <string.h>
22 #include "pthreadP.h"
23 #include <lowlevellock.h>
26 int
27 __pthread_getschedparam (threadid, policy, param)
28 pthread_t threadid;
29 int *policy;
30 struct sched_param *param;
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;
41 /* We have to handle cancellation in the following code since we are
42 locking another threads descriptor. */
43 pthread_cleanup_push ((void (*) (void *)) lll_unlock_wake_cb, &pd->lock);
45 lll_lock (pd->lock);
47 /* The library is responsible for maintaining the values at all
48 times. If the user uses a interface other than
49 pthread_setschedparam to modify the scheduler setting it is not
50 the library's problem. In case the descriptor's values have
51 not yet been retrieved do it now. */
52 if ((pd->flags & ATTR_FLAG_SCHED_SET) == 0)
54 if (__sched_getparam (pd->tid, &pd->schedparam) != 0)
55 result = 1;
56 else
57 pd->flags |= ATTR_FLAG_SCHED_SET;
60 if ((pd->flags & ATTR_FLAG_POLICY_SET) == 0)
62 pd->schedpolicy = __sched_getscheduler (pd->tid);
63 if (pd->schedpolicy == -1)
64 result = 1;
65 else
66 pd->flags |= ATTR_FLAG_POLICY_SET;
69 if (result == 0)
71 *policy = pd->schedpolicy;
72 memcpy (param, &pd->schedparam, sizeof (struct sched_param));
75 lll_unlock (pd->lock);
77 pthread_cleanup_pop (0);
79 return result;
81 strong_alias (__pthread_getschedparam, pthread_getschedparam)