1 /* 2 * Copyright (C) 2010 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_LOOPER_H_ 18 19 #define A_LOOPER_H_ 20 21 #include <media/stagefright/foundation/ABase.h> 22 #include <media/stagefright/foundation/AString.h> 23 #include <utils/Errors.h> 24 #include <utils/KeyedVector.h> 25 #include <utils/List.h> 26 #include <utils/RefBase.h> 27 #include <utils/threads.h> 28 29 namespace android { 30 31 struct AHandler; 32 struct AMessage; 33 34 struct ALooper : public RefBase { 35 typedef int32_t event_id; 36 typedef int32_t handler_id; 37 38 ALooper(); 39 40 // Takes effect in a subsequent call to start(). 41 void setName(const char *name); 42 43 handler_id registerHandler(const sp<AHandler> &handler); 44 void unregisterHandler(handler_id handlerID); 45 46 status_t start( 47 bool runOnCallingThread = false, 48 bool canCallJava = false, 49 int32_t priority = PRIORITY_DEFAULT 50 ); 51 52 status_t stop(); 53 54 static int64_t GetNowUs(); 55 56 protected: 57 virtual ~ALooper(); 58 59 private: 60 friend struct ALooperRoster; 61 62 struct Event { 63 int64_t mWhenUs; 64 sp<AMessage> mMessage; 65 }; 66 67 Mutex mLock; 68 Condition mQueueChangedCondition; 69 70 AString mName; 71 72 List<Event> mEventQueue; 73 74 struct LooperThread; 75 sp<LooperThread> mThread; 76 bool mRunningLocally; 77 78 void post(const sp<AMessage> &msg, int64_t delayUs); 79 bool loop(); 80 81 DISALLOW_EVIL_CONSTRUCTORS(ALooper); 82 }; 83 84 } // namespace android 85 86 #endif // A_LOOPER_H_ 87
