1 /*
2  * Copyright (C) 2015 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 A_WAKELOCK_H_
18 #define A_WAKELOCK_H_
19 
20 #include <media/stagefright/foundation/ABase.h>
21 #include <powermanager/IPowerManager.h>
22 #include <utils/RefBase.h>
23 
24 namespace android {
25 
26 class AWakeLock : public RefBase {
27 
28 public:
29     AWakeLock();
30 
31     // NOTE: acquire and release are not thread safe
32 
33     // returns true if wakelock was acquired
34     bool acquire();
35     void release(bool force = false);
36 
37     virtual ~AWakeLock();
38 
39 private:
40     sp<IPowerManager> mPowerManager;
41     sp<IBinder>       mWakeLockToken;
42     uint32_t          mWakeLockCount;
43 
44     class PMDeathRecipient : public IBinder::DeathRecipient {
45     public:
PMDeathRecipient(AWakeLock * wakeLock)46         explicit PMDeathRecipient(AWakeLock *wakeLock) : mWakeLock(wakeLock) {}
~PMDeathRecipient()47         virtual ~PMDeathRecipient() {}
48 
49         // IBinder::DeathRecipient
50         virtual void binderDied(const wp<IBinder> &who);
51 
52     private:
53         PMDeathRecipient(const PMDeathRecipient&);
54         PMDeathRecipient& operator= (const PMDeathRecipient&);
55 
56         AWakeLock *mWakeLock;
57     };
58 
59     const sp<PMDeathRecipient> mDeathRecipient;
60 
61     void clearPowerManager();
62 
63     DISALLOW_EVIL_CONSTRUCTORS(AWakeLock);
64 };
65 
66 }  // namespace android
67 
68 #endif  // A_WAKELOCK_H_
69