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/*
* Copyright (C) 2011 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 <sys/types.h>
#include <gui/IDisplayEventConnection.h>
#include <gui/DisplayEventReceiver.h>
#include <utils/Errors.h>
#include "DisplayHardware/DisplayHardware.h"
#include "DisplayEventConnection.h"
#include "EventThread.h"
#include "SurfaceFlinger.h"
// ---------------------------------------------------------------------------
namespace android {
// ---------------------------------------------------------------------------
EventThread::EventThread(const sp<SurfaceFlinger>& flinger)
: mFlinger(flinger),
mHw(flinger->graphicPlane(0).displayHardware()),
mDeliveredEvents(0)
{
}
void EventThread::onFirstRef() {
run("EventThread", PRIORITY_URGENT_DISPLAY + PRIORITY_MORE_FAVORABLE);
}
status_t EventThread::registerDisplayEventConnection(
const sp<DisplayEventConnection>& connection) {
Mutex::Autolock _l(mLock);
mDisplayEventConnections.add(connection);
mCondition.signal();
return NO_ERROR;
}
status_t EventThread::unregisterDisplayEventConnection(
const wp<DisplayEventConnection>& connection) {
Mutex::Autolock _l(mLock);
mDisplayEventConnections.remove(connection);
mCondition.signal();
return NO_ERROR;
}
status_t EventThread::removeDisplayEventConnection(
const wp<DisplayEventConnection>& connection) {
Mutex::Autolock _l(mLock);
mDisplayEventConnections.remove(connection);
return NO_ERROR;
}
bool EventThread::threadLoop() {
nsecs_t timestamp;
DisplayEventReceiver::Event vsync;
SortedVector<wp<DisplayEventConnection> > displayEventConnections;
{ // scope for the lock
Mutex::Autolock _l(mLock);
do {
// wait for listeners
while (!mDisplayEventConnections.size()) {
mCondition.wait(mLock);
}
// wait for vsync
mLock.unlock();
timestamp = mHw.waitForVSync();
mLock.lock();
// make sure we still have some listeners
} while (!mDisplayEventConnections.size());
// dispatch vsync events to listeners...
mDeliveredEvents++;
vsync.header.type = DisplayEventReceiver::DISPLAY_EVENT_VSYNC;
vsync.header.timestamp = timestamp;
vsync.vsync.count = mDeliveredEvents;
// make a copy of our connection list, so we can
// dispatch events without holding mLock
displayEventConnections = mDisplayEventConnections;
}
const size_t count = displayEventConnections.size();
for (size_t i=0 ; i<count ; i++) {
sp<DisplayEventConnection> conn(displayEventConnections.itemAt(i).promote());
// make sure the connection didn't die
if (conn != NULL) {
status_t err = conn->postEvent(vsync);
if (err == -EAGAIN || err == -EWOULDBLOCK) {
// The destination doesn't accept events anymore, it's probably
// full. For now, we just drop the events on the floor.
// Note that some events cannot be dropped and would have to be
// re-sent later. Right-now we don't have the ability to do
// this, but it doesn't matter for VSYNC.
} else if (err < 0) {
// handle any other error on the pipe as fatal. the only
// reasonable thing to do is to clean-up this connection.
// The most common error we'll get here is -EPIPE.
removeDisplayEventConnection(displayEventConnections.itemAt(i));
}
} else {
// somehow the connection is dead, but we still have it in our list
// just clean the list.
removeDisplayEventConnection(displayEventConnections.itemAt(i));
}
}
// clear all our references without holding mLock
displayEventConnections.clear();
return true;
}
status_t EventThread::readyToRun() {
LOGI("EventThread ready to run.");
return NO_ERROR;
}
void EventThread::dump(String8& result, char* buffer, size_t SIZE) const {
Mutex::Autolock _l(mLock);
result.append("VSYNC state:\n");
snprintf(buffer, SIZE, " numListeners=%u, events-delivered: %u\n",
mDisplayEventConnections.size(), mDeliveredEvents);
result.append(buffer);
}
// ---------------------------------------------------------------------------
}; // namespace android
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