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