1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef __CUTILS_SCHED_POLICY_H
18#define __CUTILS_SCHED_POLICY_H
19
20#ifdef __cplusplus
21extern "C" {
22#endif
23
24/* Keep in sync with THREAD_GROUP_* in frameworks/base/core/java/android/os/Process.java */
25typedef enum {
26    SP_DEFAULT    = -1,
27    SP_BACKGROUND = 0,
28    SP_FOREGROUND = 1,
29    SP_SYSTEM     = 2,  // can't be used with set_sched_policy()
30    SP_AUDIO_APP  = 3,
31    SP_AUDIO_SYS  = 4,
32    SP_CNT,
33    SP_MAX        = SP_CNT - 1,
34    SP_SYSTEM_DEFAULT = SP_FOREGROUND,
35} SchedPolicy;
36
37/* Assign thread tid to the cgroup associated with the specified policy.
38 * If the thread is a thread group leader, that is it's gettid() == getpid(),
39 * then the other threads in the same thread group are _not_ affected.
40 * On platforms which support gettid(), zero tid means current thread.
41 * Return value: 0 for success, or -errno for error.
42 */
43extern int set_sched_policy(int tid, SchedPolicy policy);
44
45/* Return the policy associated with the cgroup of thread tid via policy pointer.
46 * On platforms which support gettid(), zero tid means current thread.
47 * Return value: 0 for success, or -1 for error and set errno.
48 */
49extern int get_sched_policy(int tid, SchedPolicy *policy);
50
51/* Return a displayable string corresponding to policy.
52 * Return value: non-NULL NUL-terminated name of unspecified length;
53 * the caller is responsible for displaying the useful part of the string.
54 */
55extern const char *get_sched_policy_name(SchedPolicy policy);
56
57#ifdef __cplusplus
58}
59#endif
60
61#endif /* __CUTILS_SCHED_POLICY_H */
62