1 /*
2 * sched_setschedparam.c
3 *
4 * Description:
5 * POSIX thread functions that deal with thread scheduling.
6 *
7 * --------------------------------------------------------------------------
8 *
9 * Pthreads-win32 - POSIX Threads Library for Win32
10 * Copyright(C) 1998 John E. Bossom
11 * Copyright(C) 1999,2005 Pthreads-win32 contributors
12 *
13 * Contact Email: rpj@callisto.canberra.edu.au
14 *
15 * The current list of contributors is contained
16 * in the file CONTRIBUTORS included with the source
17 * code distribution. The list can also be seen at the
18 * following World Wide Web location:
19 * http://sources.redhat.com/pthreads-win32/contributors.html
20 *
21 * This library is free software; you can redistribute it and/or
22 * modify it under the terms of the GNU Lesser General Public
23 * License as published by the Free Software Foundation; either
24 * version 2 of the License, or (at your option) any later version.
25 *
26 * This library is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
29 * Lesser General Public License for more details.
30 *
31 * You should have received a copy of the GNU Lesser General Public
32 * License along with this library in the file COPYING.LIB;
33 * if not, write to the Free Software Foundation, Inc.,
34 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
35 */
36
37 #include "pthread.h"
38 #include "implement.h"
39 #include "sched.h"
40
41 int
pthread_setschedparam(pthread_t thread,int policy,const struct sched_param * param)42 pthread_setschedparam (pthread_t thread, int policy,
43 const struct sched_param *param)
44 {
45 int result;
46
47 /* Validate the thread id. */
48 result = pthread_kill (thread, 0);
49 if (0 != result)
50 {
51 return result;
52 }
53
54 /* Validate the scheduling policy. */
55 if (policy < SCHED_MIN || policy > SCHED_MAX)
56 {
57 return EINVAL;
58 }
59
60 /* Ensure the policy is SCHED_OTHER. */
61 if (policy != SCHED_OTHER)
62 {
63 return ENOTSUP;
64 }
65
66 return (ptw32_setthreadpriority (thread, policy, param->sched_priority));
67 }
68
69
70 int
ptw32_setthreadpriority(pthread_t thread,int policy,int priority)71 ptw32_setthreadpriority (pthread_t thread, int policy, int priority)
72 {
73 int prio;
74 ptw32_mcs_local_node_t threadLock;
75 int result = 0;
76 ptw32_thread_t * tp = (ptw32_thread_t *) thread.p;
77
78 prio = priority;
79
80 /* Validate priority level. */
81 if (prio < sched_get_priority_min (policy) ||
82 prio > sched_get_priority_max (policy))
83 {
84 return EINVAL;
85 }
86
87 #if (THREAD_PRIORITY_LOWEST > THREAD_PRIORITY_NORMAL)
88 /* WinCE */
89 #else
90 /* Everything else */
91
92 if (THREAD_PRIORITY_IDLE < prio && THREAD_PRIORITY_LOWEST > prio)
93 {
94 prio = THREAD_PRIORITY_LOWEST;
95 }
96 else if (THREAD_PRIORITY_TIME_CRITICAL > prio
97 && THREAD_PRIORITY_HIGHEST < prio)
98 {
99 prio = THREAD_PRIORITY_HIGHEST;
100 }
101
102 #endif
103
104 ptw32_mcs_lock_acquire (&tp->threadLock, &threadLock);
105
106 /* If this fails, the current priority is unchanged. */
107 if (0 == SetThreadPriority (tp->threadH, prio))
108 {
109 result = EINVAL;
110 }
111 else
112 {
113 /*
114 * Must record the thread's sched_priority as given,
115 * not as finally adjusted.
116 */
117 tp->sched_priority = priority;
118 }
119
120 ptw32_mcs_lock_release (&threadLock);
121
122 return result;
123 }
124