Andreas Huber | 7d2f703 | 2010-06-07 10:18:57 -0700 | [diff] [blame] | 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 | //#define LOG_NDEBUG 0 |
| 18 | #define LOG_TAG "ALooper" |
| 19 | #include <utils/Log.h> |
| 20 | |
| 21 | #include <sys/time.h> |
| 22 | |
| 23 | #include "ALooper.h" |
| 24 | |
| 25 | #include "AHandler.h" |
| 26 | #include "ALooperRoster.h" |
| 27 | #include "AMessage.h" |
| 28 | |
| 29 | namespace android { |
| 30 | |
| 31 | ALooperRoster gLooperRoster; |
| 32 | |
| 33 | struct ALooper::LooperThread : public Thread { |
Andreas Huber | 4f104d9 | 2010-07-02 08:00:52 -0700 | [diff] [blame] | 34 | LooperThread(ALooper *looper, bool canCallJava) |
| 35 | : Thread(canCallJava), |
| 36 | mLooper(looper) { |
Andreas Huber | 7d2f703 | 2010-06-07 10:18:57 -0700 | [diff] [blame] | 37 | } |
| 38 | |
| 39 | virtual bool threadLoop() { |
| 40 | return mLooper->loop(); |
| 41 | } |
| 42 | |
| 43 | protected: |
| 44 | virtual ~LooperThread() {} |
| 45 | |
| 46 | private: |
| 47 | ALooper *mLooper; |
| 48 | |
| 49 | DISALLOW_EVIL_CONSTRUCTORS(LooperThread); |
| 50 | }; |
| 51 | |
| 52 | // static |
| 53 | int64_t ALooper::GetNowUs() { |
| 54 | struct timeval tv; |
| 55 | gettimeofday(&tv, NULL); |
| 56 | |
| 57 | return (int64_t)tv.tv_sec * 1000000ll + tv.tv_usec; |
| 58 | } |
| 59 | |
| 60 | ALooper::ALooper() |
| 61 | : mRunningLocally(false) { |
| 62 | } |
| 63 | |
| 64 | ALooper::~ALooper() { |
| 65 | stop(); |
| 66 | } |
| 67 | |
Andreas Huber | c4e0b70 | 2010-08-27 15:21:07 -0700 | [diff] [blame] | 68 | void ALooper::setName(const char *name) { |
| 69 | mName = name; |
| 70 | } |
| 71 | |
Andreas Huber | 7d2f703 | 2010-06-07 10:18:57 -0700 | [diff] [blame] | 72 | ALooper::handler_id ALooper::registerHandler(const sp<AHandler> &handler) { |
| 73 | return gLooperRoster.registerHandler(this, handler); |
| 74 | } |
| 75 | |
| 76 | void ALooper::unregisterHandler(handler_id handlerID) { |
| 77 | gLooperRoster.unregisterHandler(handlerID); |
| 78 | } |
| 79 | |
Andreas Huber | 4e4173b | 2010-07-22 09:20:13 -0700 | [diff] [blame] | 80 | status_t ALooper::start( |
| 81 | bool runOnCallingThread, bool canCallJava, int32_t priority) { |
Andreas Huber | 7d2f703 | 2010-06-07 10:18:57 -0700 | [diff] [blame] | 82 | if (runOnCallingThread) { |
| 83 | { |
| 84 | Mutex::Autolock autoLock(mLock); |
| 85 | |
| 86 | if (mThread != NULL || mRunningLocally) { |
| 87 | return INVALID_OPERATION; |
| 88 | } |
| 89 | |
| 90 | mRunningLocally = true; |
| 91 | } |
| 92 | |
| 93 | do { |
| 94 | } while (loop()); |
| 95 | |
| 96 | return OK; |
| 97 | } |
| 98 | |
| 99 | Mutex::Autolock autoLock(mLock); |
| 100 | |
| 101 | if (mThread != NULL || mRunningLocally) { |
| 102 | return INVALID_OPERATION; |
| 103 | } |
| 104 | |
Andreas Huber | 4f104d9 | 2010-07-02 08:00:52 -0700 | [diff] [blame] | 105 | mThread = new LooperThread(this, canCallJava); |
Andreas Huber | 7d2f703 | 2010-06-07 10:18:57 -0700 | [diff] [blame] | 106 | |
Andreas Huber | c4e0b70 | 2010-08-27 15:21:07 -0700 | [diff] [blame] | 107 | status_t err = mThread->run( |
| 108 | mName.empty() ? "ALooper" : mName.c_str(), priority); |
Andreas Huber | 7d2f703 | 2010-06-07 10:18:57 -0700 | [diff] [blame] | 109 | if (err != OK) { |
| 110 | mThread.clear(); |
| 111 | } |
| 112 | |
| 113 | return err; |
| 114 | } |
| 115 | |
| 116 | status_t ALooper::stop() { |
| 117 | sp<LooperThread> thread; |
| 118 | bool runningLocally; |
| 119 | |
| 120 | { |
| 121 | Mutex::Autolock autoLock(mLock); |
| 122 | |
| 123 | thread = mThread; |
| 124 | runningLocally = mRunningLocally; |
| 125 | mThread.clear(); |
| 126 | mRunningLocally = false; |
| 127 | } |
| 128 | |
| 129 | if (thread == NULL && !runningLocally) { |
| 130 | return INVALID_OPERATION; |
| 131 | } |
| 132 | |
| 133 | if (thread != NULL) { |
| 134 | thread->requestExit(); |
| 135 | } |
| 136 | |
| 137 | mQueueChangedCondition.signal(); |
| 138 | |
| 139 | if (!runningLocally) { |
| 140 | thread->requestExitAndWait(); |
| 141 | } |
| 142 | |
| 143 | return OK; |
| 144 | } |
| 145 | |
| 146 | void ALooper::post(const sp<AMessage> &msg, int64_t delayUs) { |
| 147 | Mutex::Autolock autoLock(mLock); |
| 148 | |
| 149 | int64_t whenUs; |
| 150 | if (delayUs > 0) { |
| 151 | whenUs = GetNowUs() + delayUs; |
| 152 | } else { |
| 153 | whenUs = GetNowUs(); |
| 154 | } |
| 155 | |
| 156 | List<Event>::iterator it = mEventQueue.begin(); |
| 157 | while (it != mEventQueue.end() && (*it).mWhenUs <= whenUs) { |
| 158 | ++it; |
| 159 | } |
| 160 | |
| 161 | Event event; |
| 162 | event.mWhenUs = whenUs; |
| 163 | event.mMessage = msg; |
| 164 | |
| 165 | if (it == mEventQueue.begin()) { |
| 166 | mQueueChangedCondition.signal(); |
| 167 | } |
| 168 | |
| 169 | mEventQueue.insert(it, event); |
| 170 | } |
| 171 | |
| 172 | bool ALooper::loop() { |
| 173 | Event event; |
| 174 | |
| 175 | { |
| 176 | Mutex::Autolock autoLock(mLock); |
| 177 | if (mThread == NULL && !mRunningLocally) { |
| 178 | return false; |
| 179 | } |
| 180 | if (mEventQueue.empty()) { |
| 181 | mQueueChangedCondition.wait(mLock); |
| 182 | return true; |
| 183 | } |
| 184 | int64_t whenUs = (*mEventQueue.begin()).mWhenUs; |
| 185 | int64_t nowUs = GetNowUs(); |
| 186 | |
| 187 | if (whenUs > nowUs) { |
| 188 | int64_t delayUs = whenUs - nowUs; |
| 189 | mQueueChangedCondition.waitRelative(mLock, delayUs * 1000ll); |
| 190 | |
| 191 | return true; |
| 192 | } |
| 193 | |
| 194 | event = *mEventQueue.begin(); |
| 195 | mEventQueue.erase(mEventQueue.begin()); |
| 196 | } |
| 197 | |
| 198 | gLooperRoster.deliverMessage(event.mMessage); |
| 199 | |
| 200 | return true; |
| 201 | } |
| 202 | |
| 203 | } // namespace android |