6bf552ee02
This way we don't get stuck if, say, the driver decides not to send us vsync events. Change-Id: I4af6358b3a1f304eaae5fd926ed3403fa1091827
328 lines
12 KiB
C++
328 lines
12 KiB
C++
/*
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* Copyright (C) 2011 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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#define ATRACE_TAG ATRACE_TAG_GRAPHICS
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#include <stdint.h>
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#include <sys/types.h>
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#include <cutils/compiler.h>
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#include <gui/BitTube.h>
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#include <gui/IDisplayEventConnection.h>
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#include <gui/DisplayEventReceiver.h>
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#include <utils/Errors.h>
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#include <utils/String8.h>
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#include <utils/Trace.h>
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#include "EventThread.h"
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#include "SurfaceFlinger.h"
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// ---------------------------------------------------------------------------
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namespace android {
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// ---------------------------------------------------------------------------
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EventThread::EventThread(const sp<SurfaceFlinger>& flinger)
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: mFlinger(flinger),
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mVSyncTimestamp(0),
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mUseSoftwareVSync(false),
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mVSyncCount(0),
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mDebugVsyncEnabled(false) {
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}
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void EventThread::onFirstRef() {
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run("EventThread", PRIORITY_URGENT_DISPLAY + PRIORITY_MORE_FAVORABLE);
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}
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sp<EventThread::Connection> EventThread::createEventConnection() const {
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return new Connection(const_cast<EventThread*>(this));
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}
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status_t EventThread::registerDisplayEventConnection(
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const sp<EventThread::Connection>& connection) {
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Mutex::Autolock _l(mLock);
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mDisplayEventConnections.add(connection);
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mCondition.broadcast();
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return NO_ERROR;
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}
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void EventThread::removeDisplayEventConnection(
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const wp<EventThread::Connection>& connection) {
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Mutex::Autolock _l(mLock);
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mDisplayEventConnections.remove(connection);
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}
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void EventThread::setVsyncRate(uint32_t count,
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const sp<EventThread::Connection>& connection) {
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if (int32_t(count) >= 0) { // server must protect against bad params
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Mutex::Autolock _l(mLock);
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const int32_t new_count = (count == 0) ? -1 : count;
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if (connection->count != new_count) {
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connection->count = new_count;
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mCondition.broadcast();
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}
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}
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}
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void EventThread::requestNextVsync(
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const sp<EventThread::Connection>& connection) {
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Mutex::Autolock _l(mLock);
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if (connection->count < 0) {
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connection->count = 0;
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mCondition.broadcast();
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}
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}
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void EventThread::onScreenReleased() {
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Mutex::Autolock _l(mLock);
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if (!mUseSoftwareVSync) {
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// disable reliance on h/w vsync
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mUseSoftwareVSync = true;
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mCondition.broadcast();
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}
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}
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void EventThread::onScreenAcquired() {
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Mutex::Autolock _l(mLock);
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if (mUseSoftwareVSync) {
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// resume use of h/w vsync
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mUseSoftwareVSync = false;
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mCondition.broadcast();
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}
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}
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void EventThread::onVSyncReceived(const wp<IBinder>&, nsecs_t timestamp) {
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Mutex::Autolock _l(mLock);
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mVSyncTimestamp = timestamp;
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mVSyncCount++;
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mCondition.broadcast();
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}
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bool EventThread::threadLoop() {
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DisplayEventReceiver::Event vsync;
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Vector< sp<EventThread::Connection> > signalConnections;
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signalConnections = waitForEvent(&vsync);
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// dispatch vsync events to listeners...
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const size_t count = signalConnections.size();
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for (size_t i=0 ; i<count ; i++) {
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const sp<Connection>& conn(signalConnections[i]);
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// now see if we still need to report this VSYNC event
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status_t err = conn->postEvent(vsync);
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if (err == -EAGAIN || err == -EWOULDBLOCK) {
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// The destination doesn't accept events anymore, it's probably
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// full. For now, we just drop the events on the floor.
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// Note that some events cannot be dropped and would have to be
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// re-sent later. Right-now we don't have the ability to do
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// this, but it doesn't matter for VSYNC.
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} else if (err < 0) {
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// handle any other error on the pipe as fatal. the only
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// reasonable thing to do is to clean-up this connection.
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// The most common error we'll get here is -EPIPE.
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removeDisplayEventConnection(signalConnections[i]);
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}
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}
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return true;
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}
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// This will return when (1) a vsync event has been received, and (2) there was
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// at least one connection interested in receiving it when we started waiting.
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Vector< sp<EventThread::Connection> > EventThread::waitForEvent(
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DisplayEventReceiver::Event* event)
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{
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Mutex::Autolock _l(mLock);
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size_t vsyncCount;
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nsecs_t timestamp;
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Vector< sp<EventThread::Connection> > signalConnections;
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do {
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// latch VSYNC event if any
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bool waitForVSync = false;
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vsyncCount = mVSyncCount;
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timestamp = mVSyncTimestamp;
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mVSyncTimestamp = 0;
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// find out connections waiting for events
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size_t count = mDisplayEventConnections.size();
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for (size_t i=0 ; i<count ; i++) {
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sp<Connection> connection(mDisplayEventConnections[i].promote());
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if (connection != NULL) {
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if (connection->count >= 0) {
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// we need vsync events because at least
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// one connection is waiting for it
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waitForVSync = true;
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if (timestamp) {
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// we consume the event only if it's time
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// (ie: we received a vsync event)
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if (connection->count == 0) {
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// fired this time around
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connection->count = -1;
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signalConnections.add(connection);
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} else if (connection->count == 1 ||
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(vsyncCount % connection->count) == 0) {
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// continuous event, and time to report it
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signalConnections.add(connection);
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}
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}
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}
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} else {
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// we couldn't promote this reference, the connection has
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// died, so clean-up!
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mDisplayEventConnections.removeAt(i);
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--i; --count;
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}
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}
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// Here we figure out if we need to enable or disable vsyncs
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if (timestamp && !waitForVSync) {
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// we received a VSYNC but we have no clients
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// don't report it, and disable VSYNC events
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disableVSyncLocked();
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} else if (!timestamp && waitForVSync) {
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// we have at least one client, so we want vsync enabled
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// (TODO: this function is called right after we finish
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// notifying clients of a vsync, so this call will be made
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// at the vsync rate, e.g. 60fps. If we can accurately
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// track the current state we could avoid making this call
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// so often.)
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enableVSyncLocked();
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}
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// note: !timestamp implies signalConnections.isEmpty(), because we
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// don't populate signalConnections if there's no vsync pending
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if (!timestamp) {
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// wait for something to happen
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if (waitForVSync) {
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// This is where we spend most of our time, waiting
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// for vsync events and new client registrations.
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//
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// If the screen is off, we can't use h/w vsync, so we
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// use a 16ms timeout instead. It doesn't need to be
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// precise, we just need to keep feeding our clients.
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//
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// We don't want to stall if there's a driver bug, so we
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// use a (long) timeout when waiting for h/w vsync, and
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// generate fake events when necessary.
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bool softwareSync = mUseSoftwareVSync;
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nsecs_t timeout = softwareSync ? ms2ns(16) : ms2ns(1000);
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if (mCondition.waitRelative(mLock, timeout) == TIMED_OUT) {
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if (!softwareSync) {
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ALOGW("Timed out waiting for hw vsync; faking it");
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}
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mVSyncTimestamp = systemTime(SYSTEM_TIME_MONOTONIC);
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mVSyncCount++;
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}
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} else {
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// Nobody is interested in vsync, so we just want to sleep.
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// h/w vsync should be disabled, so this will wait until we
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// get a new connection, or an existing connection becomes
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// interested in receiving vsync again.
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mCondition.wait(mLock);
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}
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}
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} while (signalConnections.isEmpty());
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// here we're guaranteed to have a timestamp and some connections to signal
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// (The connections might have dropped out of mDisplayEventConnections
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// while we were asleep, but we'll still have strong references to them.)
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// fill in vsync event info
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event->header.type = DisplayEventReceiver::DISPLAY_EVENT_VSYNC;
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event->header.timestamp = timestamp;
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event->vsync.count = vsyncCount;
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return signalConnections;
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}
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void EventThread::enableVSyncLocked() {
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if (!mUseSoftwareVSync) {
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// never enable h/w VSYNC when screen is off
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mFlinger->eventControl(SurfaceFlinger::EVENT_VSYNC, true);
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mPowerHAL.vsyncHint(true);
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}
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mDebugVsyncEnabled = true;
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}
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void EventThread::disableVSyncLocked() {
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mFlinger->eventControl(SurfaceFlinger::EVENT_VSYNC, false);
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mPowerHAL.vsyncHint(false);
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mDebugVsyncEnabled = false;
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}
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status_t EventThread::readyToRun() {
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ALOGI("EventThread ready to run.");
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return NO_ERROR;
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}
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void EventThread::dump(String8& result, char* buffer, size_t SIZE) const {
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Mutex::Autolock _l(mLock);
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result.appendFormat("VSYNC state: %s\n",
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mDebugVsyncEnabled?"enabled":"disabled");
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result.appendFormat(" soft-vsync: %s\n",
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mUseSoftwareVSync?"enabled":"disabled");
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result.appendFormat(" numListeners=%u,\n events-delivered: %u\n",
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mDisplayEventConnections.size(), mVSyncCount);
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for (size_t i=0 ; i<mDisplayEventConnections.size() ; i++) {
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sp<Connection> connection =
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mDisplayEventConnections.itemAt(i).promote();
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result.appendFormat(" %p: count=%d\n",
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connection.get(), connection!=NULL ? connection->count : 0);
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}
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}
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// ---------------------------------------------------------------------------
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EventThread::Connection::Connection(
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const sp<EventThread>& eventThread)
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: count(-1), mEventThread(eventThread), mChannel(new BitTube())
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{
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}
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EventThread::Connection::~Connection() {
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// do nothing here -- clean-up will happen automatically
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// when the main thread wakes up
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}
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void EventThread::Connection::onFirstRef() {
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// NOTE: mEventThread doesn't hold a strong reference on us
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mEventThread->registerDisplayEventConnection(this);
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}
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sp<BitTube> EventThread::Connection::getDataChannel() const {
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return mChannel;
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}
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void EventThread::Connection::setVsyncRate(uint32_t count) {
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mEventThread->setVsyncRate(count, this);
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}
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void EventThread::Connection::requestNextVsync() {
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mEventThread->requestNextVsync(this);
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}
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status_t EventThread::Connection::postEvent(
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const DisplayEventReceiver::Event& event) {
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ssize_t size = DisplayEventReceiver::sendEvents(mChannel, &event, 1);
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return size < 0 ? status_t(size) : status_t(NO_ERROR);
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}
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// ---------------------------------------------------------------------------
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}; // namespace android
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