161 lines
4.4 KiB
C++
161 lines
4.4 KiB
C++
/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdint.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <binder/IPCThreadState.h>
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#include <utils/threads.h>
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#include <utils/Timers.h>
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#include <utils/Log.h>
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#include <gui/IDisplayEventConnection.h>
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#include <gui/BitTube.h>
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#include "MessageQueue.h"
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#include "EventThread.h"
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namespace android {
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// ---------------------------------------------------------------------------
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MessageBase::MessageBase()
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: MessageHandler() {
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}
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MessageBase::~MessageBase() {
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}
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void MessageBase::handleMessage(const Message&) {
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this->handler();
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barrier.open();
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};
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// ---------------------------------------------------------------------------
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MessageQueue::MessageQueue()
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: mLooper(new Looper(true)), mWorkPending(0)
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{
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}
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MessageQueue::~MessageQueue() {
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}
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void MessageQueue::setEventThread(const sp<EventThread>& eventThread)
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{
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mEventThread = eventThread;
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mEvents = eventThread->createEventConnection();
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mEventTube = mEvents->getDataChannel();
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mLooper->addFd(mEventTube->getFd(), 0, ALOOPER_EVENT_INPUT,
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MessageQueue::cb_eventReceiver, this);
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}
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void MessageQueue::waitMessage() {
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do {
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IPCThreadState::self()->flushCommands();
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int32_t ret = mLooper->pollOnce(-1);
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switch (ret) {
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case ALOOPER_POLL_WAKE:
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case ALOOPER_POLL_CALLBACK:
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// callback and/or wake
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if (android_atomic_and(0, &mWorkPending)) {
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return;
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}
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continue;
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case ALOOPER_POLL_TIMEOUT:
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// timeout (should not happen)
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continue;
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case ALOOPER_POLL_ERROR:
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ALOGE("ALOOPER_POLL_ERROR");
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continue;
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default:
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// should not happen
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ALOGE("Looper::pollOnce() returned unknown status %d", ret);
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continue;
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}
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} while (true);
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}
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status_t MessageQueue::postMessage(
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const sp<MessageBase>& messageHandler, nsecs_t relTime)
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{
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const Message dummyMessage;
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if (relTime > 0) {
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mLooper->sendMessageDelayed(relTime, messageHandler, dummyMessage);
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} else {
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mLooper->sendMessage(messageHandler, dummyMessage);
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}
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return NO_ERROR;
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}
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void MessageQueue::scheduleWorkASAP() {
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if (android_atomic_or(1, &mWorkPending) == 0) {
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mLooper->wake();
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}
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}
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status_t MessageQueue::invalidate() {
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mEvents->requestNextVsync();
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return NO_ERROR;
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}
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int MessageQueue::cb_eventReceiver(int fd, int events, void* data) {
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MessageQueue* queue = reinterpret_cast<MessageQueue *>(data);
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return queue->eventReceiver(fd, events);
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}
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int MessageQueue::eventReceiver(int fd, int events) {
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ssize_t n;
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DisplayEventReceiver::Event buffer[8];
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while ((n = getEvents(buffer, 8)) > 0) {
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for (int i=0 ; i<n ; i++) {
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if (buffer[i].header.type == DisplayEventReceiver::DISPLAY_EVENT_VSYNC) {
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scheduleWorkASAP();
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break;
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}
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}
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}
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return 1;
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}
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ssize_t MessageQueue::getEvents(
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DisplayEventReceiver::Event* events, size_t count)
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{
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ssize_t size = mEventTube->read(events, sizeof(events[0])*count);
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ALOGE_IF(size<0, "MessageQueue::getEvents error (%s)", strerror(-size));
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if (size >= 0) {
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// Note: if (size % sizeof(events[0])) != 0, we've got a
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// partial read. This can happen if the queue filed up (ie: if we
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// didn't pull from it fast enough).
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// We discard the partial event and rely on the sender to
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// re-send the event if appropriate (some events, like VSYNC
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// can be lost forever).
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// returns number of events read
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size /= sizeof(events[0]);
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}
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return size;
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}
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// ---------------------------------------------------------------------------
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}; // namespace android
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