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      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 audio threads */
     59     ANDROID_PRIORITY_AUDIO          = -16,
     60 
     61     /* service audio threads (uncommon) */
     62     ANDROID_PRIORITY_URGENT_AUDIO   = -19,
     63 
     64     /* should never be used in practice. regular process might not
     65      * be allowed to use this level */
     66     ANDROID_PRIORITY_HIGHEST        = -20,
     67 
     68     ANDROID_PRIORITY_DEFAULT        = ANDROID_PRIORITY_NORMAL,
     69     ANDROID_PRIORITY_MORE_FAVORABLE = -1,
     70     ANDROID_PRIORITY_LESS_FAVORABLE = +1,
     71 };
     72 
     73 #if defined(__cplusplus)
     74 }
     75 #endif
     76 
     77 #endif /* ANDROID_THREAD_DEFS_H */
     78