1 /*
2  * Copyright (C) 2014 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_AUDIO_FAST_THREAD_STATE_H
18 #define ANDROID_AUDIO_FAST_THREAD_STATE_H
19 
20 #include "Configuration.h"
21 #include <stdint.h>
22 #include <media/nblog/NBLog.h>
23 
24 namespace android {
25 
26 struct FastThreadDumpState;
27 
28 // Represents a single state of a FastThread
29 struct FastThreadState {
30                 FastThreadState();
31     /*virtual*/ ~FastThreadState();
32 
33     typedef uint32_t Command;
34     static const Command
35         INITIAL = 0,            // used only for the initial state
36         HOT_IDLE = 1,           // do nothing
37         COLD_IDLE = 2,          // wait for the futex
38         IDLE = 3,               // either HOT_IDLE or COLD_IDLE
39         EXIT = 4;               // exit from thread
40         // additional values defined per subclass
41     Command     mCommand;       // current command
42     int32_t*    mColdFutexAddr; // for COLD_IDLE only, pointer to the associated futex
43     unsigned    mColdGen;       // increment when COLD_IDLE is requested so it's only performed once
44 
45     // This might be a one-time configuration rather than per-state
46     FastThreadDumpState* mDumpState; // if non-NULL, then update dump state periodically
47     NBLog::Writer* mNBLogWriter; // non-blocking logger
48 
49     // returns NULL if command belongs to a subclass
50     static const char *commandToString(Command command);
51 };  // struct FastThreadState
52 
53 }   // android
54 
55 #endif  // ANDROID_AUDIO_FAST_THREAD_STATE_H
56