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      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 _LIBS_UTILS_THREAD_DEFS_H
     18 #define _LIBS_UTILS_THREAD_DEFS_H
     19 
     20 #include <stdint.h>
     21 #include <sys/types.h>
     22 #include <system/graphics.h>
     23 
     24 // ---------------------------------------------------------------------------
     25 // C API
     26 
     27 #ifdef __cplusplus
     28 extern "C" {
     29 #endif
     30 
     31 typedef void* android_thread_id_t;
     32 
     33 typedef int (*android_thread_func_t)(void*);
     34 
     35 enum {
     36     /*
     37      * ***********************************************
     38      * ** Keep in sync with android.os.Process.java **
     39      * ***********************************************
     40      *
     41      * This maps directly to the "nice" priorities we use in Android.
     42      * A thread priority should be chosen inverse-proportionally to
     43      * the amount of work the thread is expected to do. The more work
     44      * a thread will do, the less favorable priority it should get so that
     45      * it doesn't starve the system. Threads not behaving properly might
     46      * be "punished" by the kernel.
     47      * Use the levels below when appropriate. Intermediate values are
     48      * acceptable, preferably use the {MORE|LESS}_FAVORABLE constants below.
     49      */
     50     ANDROID_PRIORITY_LOWEST         =  19,
     51 
     52     /* use for background tasks */
     53     ANDROID_PRIORITY_BACKGROUND     =  10,
     54 
     55     /* most threads run at normal priority */
     56     ANDROID_PRIORITY_NORMAL         =   0,
     57 
     58     /* threads currently running a UI that the user is interacting with */
     59     ANDROID_PRIORITY_FOREGROUND     =  -2,
     60 
     61     /* the main UI thread has a slightly more favorable priority */
     62     ANDROID_PRIORITY_DISPLAY        =  -4,
     63 
     64     /* ui service treads might want to run at a urgent display (uncommon) */
     65     ANDROID_PRIORITY_URGENT_DISPLAY =  HAL_PRIORITY_URGENT_DISPLAY,
     66 
     67     /* all normal audio threads */
     68     ANDROID_PRIORITY_AUDIO          = -16,
     69 
     70     /* service audio threads (uncommon) */
     71     ANDROID_PRIORITY_URGENT_AUDIO   = -19,
     72 
     73     /* should never be used in practice. regular process might not
     74      * be allowed to use this level */
     75     ANDROID_PRIORITY_HIGHEST        = -20,
     76 
     77     ANDROID_PRIORITY_DEFAULT        = ANDROID_PRIORITY_NORMAL,
     78     ANDROID_PRIORITY_MORE_FAVORABLE = -1,
     79     ANDROID_PRIORITY_LESS_FAVORABLE = +1,
     80 };
     81 
     82 #ifdef __cplusplus
     83 } // extern "C"
     84 #endif
     85 
     86 // ---------------------------------------------------------------------------
     87 // C++ API
     88 #ifdef __cplusplus
     89 namespace android {
     90 // ---------------------------------------------------------------------------
     91 
     92 typedef android_thread_id_t thread_id_t;
     93 typedef android_thread_func_t thread_func_t;
     94 
     95 enum {
     96     PRIORITY_LOWEST         = ANDROID_PRIORITY_LOWEST,
     97     PRIORITY_BACKGROUND     = ANDROID_PRIORITY_BACKGROUND,
     98     PRIORITY_NORMAL         = ANDROID_PRIORITY_NORMAL,
     99     PRIORITY_FOREGROUND     = ANDROID_PRIORITY_FOREGROUND,
    100     PRIORITY_DISPLAY        = ANDROID_PRIORITY_DISPLAY,
    101     PRIORITY_URGENT_DISPLAY = ANDROID_PRIORITY_URGENT_DISPLAY,
    102     PRIORITY_AUDIO          = ANDROID_PRIORITY_AUDIO,
    103     PRIORITY_URGENT_AUDIO   = ANDROID_PRIORITY_URGENT_AUDIO,
    104     PRIORITY_HIGHEST        = ANDROID_PRIORITY_HIGHEST,
    105     PRIORITY_DEFAULT        = ANDROID_PRIORITY_DEFAULT,
    106     PRIORITY_MORE_FAVORABLE = ANDROID_PRIORITY_MORE_FAVORABLE,
    107     PRIORITY_LESS_FAVORABLE = ANDROID_PRIORITY_LESS_FAVORABLE,
    108 };
    109 
    110 // ---------------------------------------------------------------------------
    111 }; // namespace android
    112 #endif  // __cplusplus
    113 // ---------------------------------------------------------------------------
    114 
    115 
    116 #endif // _LIBS_UTILS_THREAD_DEFS_H
    117