1 /* 2 * Copyright (C) 2009 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 #include <errno.h> 18 #include <stdint.h> 19 #include <sys/types.h> 20 21 #include <binder/IPCThreadState.h> 22 23 #include <utils/Log.h> 24 #include <utils/Timers.h> 25 #include <utils/threads.h> 26 27 #include <gui/DisplayEventReceiver.h> 28 #include <gui/IDisplayEventConnection.h> 29 30 #include "EventThread.h" 31 #include "MessageQueue.h" 32 #include "SurfaceFlinger.h" 33 34 namespace android { 35 36 // --------------------------------------------------------------------------- 37 38 MessageBase::MessageBase() : MessageHandler() {} 39 40 MessageBase::~MessageBase() {} 41 42 void MessageBase::handleMessage(const Message&) { 43 this->handler(); 44 barrier.open(); 45 }; 46 47 // --------------------------------------------------------------------------- 48 49 MessageQueue::~MessageQueue() = default; 50 51 // --------------------------------------------------------------------------- 52 53 namespace impl { 54 55 void MessageQueue::Handler::dispatchRefresh() { 56 if ((android_atomic_or(eventMaskRefresh, &mEventMask) & eventMaskRefresh) == 0) { 57 mQueue.mLooper->sendMessage(this, Message(MessageQueue::REFRESH)); 58 } 59 } 60 61 void MessageQueue::Handler::dispatchInvalidate() { 62 if ((android_atomic_or(eventMaskInvalidate, &mEventMask) & eventMaskInvalidate) == 0) { 63 mQueue.mLooper->sendMessage(this, Message(MessageQueue::INVALIDATE)); 64 } 65 } 66 67 void MessageQueue::Handler::handleMessage(const Message& message) { 68 switch (message.what) { 69 case INVALIDATE: 70 android_atomic_and(~eventMaskInvalidate, &mEventMask); 71 mQueue.mFlinger->onMessageReceived(message.what); 72 break; 73 case REFRESH: 74 android_atomic_and(~eventMaskRefresh, &mEventMask); 75 mQueue.mFlinger->onMessageReceived(message.what); 76 break; 77 } 78 } 79 80 // --------------------------------------------------------------------------- 81 82 void MessageQueue::init(const sp<SurfaceFlinger>& flinger) { 83 mFlinger = flinger; 84 mLooper = new Looper(true); 85 mHandler = new Handler(*this); 86 } 87 88 void MessageQueue::setEventThread(android::EventThread* eventThread) { 89 if (mEventThread == eventThread) { 90 return; 91 } 92 93 if (mEventTube.getFd() >= 0) { 94 mLooper->removeFd(mEventTube.getFd()); 95 } 96 97 mEventThread = eventThread; 98 mEvents = eventThread->createEventConnection(); 99 mEvents->stealReceiveChannel(&mEventTube); 100 mLooper->addFd(mEventTube.getFd(), 0, Looper::EVENT_INPUT, MessageQueue::cb_eventReceiver, 101 this); 102 } 103 104 void MessageQueue::waitMessage() { 105 do { 106 IPCThreadState::self()->flushCommands(); 107 int32_t ret = mLooper->pollOnce(-1); 108 switch (ret) { 109 case Looper::POLL_WAKE: 110 case Looper::POLL_CALLBACK: 111 continue; 112 case Looper::POLL_ERROR: 113 ALOGE("Looper::POLL_ERROR"); 114 continue; 115 case Looper::POLL_TIMEOUT: 116 // timeout (should not happen) 117 continue; 118 default: 119 // should not happen 120 ALOGE("Looper::pollOnce() returned unknown status %d", ret); 121 continue; 122 } 123 } while (true); 124 } 125 126 status_t MessageQueue::postMessage(const sp<MessageBase>& messageHandler, nsecs_t relTime) { 127 const Message dummyMessage; 128 if (relTime > 0) { 129 mLooper->sendMessageDelayed(relTime, messageHandler, dummyMessage); 130 } else { 131 mLooper->sendMessage(messageHandler, dummyMessage); 132 } 133 return NO_ERROR; 134 } 135 136 void MessageQueue::invalidate() { 137 mEvents->requestNextVsync(); 138 } 139 140 void MessageQueue::refresh() { 141 mHandler->dispatchRefresh(); 142 } 143 144 int MessageQueue::cb_eventReceiver(int fd, int events, void* data) { 145 MessageQueue* queue = reinterpret_cast<MessageQueue*>(data); 146 return queue->eventReceiver(fd, events); 147 } 148 149 int MessageQueue::eventReceiver(int /*fd*/, int /*events*/) { 150 ssize_t n; 151 DisplayEventReceiver::Event buffer[8]; 152 while ((n = DisplayEventReceiver::getEvents(&mEventTube, buffer, 8)) > 0) { 153 for (int i = 0; i < n; i++) { 154 if (buffer[i].header.type == DisplayEventReceiver::DISPLAY_EVENT_VSYNC) { 155 mHandler->dispatchInvalidate(); 156 break; 157 } 158 } 159 } 160 return 1; 161 } 162 163 // --------------------------------------------------------------------------- 164 165 } // namespace impl 166 } // namespace android 167