include/android_stub/system/thread_defs.h

   1 /*
   2  * Copyright (C) 2013 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 ANDROID_THREAD_DEFS_H
  18 #define ANDROID_THREAD_DEFS_H
  19
  20 #include "graphics.h"
  21
  22 #if defined(__cplusplus)
  23 extern "C" {
  24 #endif
  25
  26 enum {
  27     /*
  28      * ***********************************************
  29      * ** Keep in sync with android.os.Process.java **
  30      * ***********************************************
  31      *
  32      * This maps directly to the "nice" priorities we use in Android.
  33      * A thread priority should be chosen inverse-proportionally to
  34      * the amount of work the thread is expected to do. The more work
  35      * a thread will do, the less favorable priority it should get so that
  36      * it doesn't starve the system. Threads not behaving properly might
  37      * be "punished" by the kernel.
  38      * Use the levels below when appropriate. Intermediate values are
  39      * acceptable, preferably use the {MORE|LESS}_FAVORABLE constants below.
  40      */
  41     ANDROID_PRIORITY_LOWEST         =  19,
  42
  43     /* use for background tasks */
  44     ANDROID_PRIORITY_BACKGROUND     =  10,
  45
  46     /* most threads run at normal priority */
  47     ANDROID_PRIORITY_NORMAL         =   0,
  48
  49     /* threads currently running a UI that the user is interacting with */
  50     ANDROID_PRIORITY_FOREGROUND     =  -2,
  51
  52     /* the main UI thread has a slightly more favorable priority */
  53     ANDROID_PRIORITY_DISPLAY        =  -4,
  54
  55     /* ui service treads might want to run at a urgent display (uncommon) */
  56     ANDROID_PRIORITY_URGENT_DISPLAY =  HAL_PRIORITY_URGENT_DISPLAY,
  57
  58     /* all normal video threads */
  59     ANDROID_PRIORITY_VIDEO          = -10,
  60
  61     /* all normal audio threads */
  62     ANDROID_PRIORITY_AUDIO          = -16,
  63
  64     /* service audio threads (uncommon) */
  65     ANDROID_PRIORITY_URGENT_AUDIO   = -19,
  66
  67     /* should never be used in practice. regular process might not
  68      * be allowed to use this level */
  69     ANDROID_PRIORITY_HIGHEST        = -20,
  70
  71     ANDROID_PRIORITY_DEFAULT        = ANDROID_PRIORITY_NORMAL,
  72     ANDROID_PRIORITY_MORE_FAVORABLE = -1,
  73     ANDROID_PRIORITY_LESS_FAVORABLE = +1,
  74 };
  75
  76 #if defined(__cplusplus)
  77 }
  78 #endif
  79
  80 #endif /* ANDROID_THREAD_DEFS_H */