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 21 extern "C" { 22 #endif 23 24 /* Keep in sync with THREAD_GROUP_* in frameworks/base/core/java/android/os/Process.java */ 25 typedef 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 */ 43 extern 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 */ 49 extern 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 */ 55 extern const char *get_sched_policy_name(SchedPolicy policy); 56 57 #ifdef __cplusplus 58 } 59 #endif 60 61 #endif /* __CUTILS_SCHED_POLICY_H */ 62