| /* |
| * Copyright 2018 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. |
| */ |
| |
| //#define LOG_NDEBUG 0 |
| #undef LOG_TAG |
| #define LOG_TAG "TransactionCompletedThread" |
| #define ATRACE_TAG ATRACE_TAG_GRAPHICS |
| |
| #include "TransactionCompletedThread.h" |
| |
| #include <cinttypes> |
| |
| #include <binder/IInterface.h> |
| #include <gui/ITransactionCompletedListener.h> |
| #include <utils/RefBase.h> |
| |
| namespace android { |
| |
| // Returns 0 if they are equal |
| // <0 if the first id that doesn't match is lower in c2 or all ids match but c2 is shorter |
| // >0 if the first id that doesn't match is greater in c2 or all ids match but c2 is longer |
| // |
| // See CallbackIdsHash for a explaniation of why this works |
| static int compareCallbackIds(const std::vector<CallbackId>& c1, |
| const std::vector<CallbackId>& c2) { |
| if (c1.empty()) { |
| return !c2.empty(); |
| } |
| return c1.front() - c2.front(); |
| } |
| |
| TransactionCompletedThread::~TransactionCompletedThread() { |
| std::lock_guard lockThread(mThreadMutex); |
| |
| { |
| std::lock_guard lock(mMutex); |
| mKeepRunning = false; |
| mConditionVariable.notify_all(); |
| } |
| |
| if (mThread.joinable()) { |
| mThread.join(); |
| } |
| |
| { |
| std::lock_guard lock(mMutex); |
| for (const auto& [listener, transactionStats] : mCompletedTransactions) { |
| IInterface::asBinder(listener)->unlinkToDeath(mDeathRecipient); |
| } |
| } |
| } |
| |
| void TransactionCompletedThread::run() { |
| std::lock_guard lock(mMutex); |
| if (mRunning || !mKeepRunning) { |
| return; |
| } |
| mDeathRecipient = new ThreadDeathRecipient(); |
| mRunning = true; |
| |
| std::lock_guard lockThread(mThreadMutex); |
| mThread = std::thread(&TransactionCompletedThread::threadMain, this); |
| } |
| |
| status_t TransactionCompletedThread::addCallback(const sp<ITransactionCompletedListener>& listener, |
| const std::vector<CallbackId>& callbackIds) { |
| std::lock_guard lock(mMutex); |
| if (!mRunning) { |
| ALOGE("cannot add callback because the callback thread isn't running"); |
| return BAD_VALUE; |
| } |
| |
| if (mCompletedTransactions.count(listener) == 0) { |
| status_t err = IInterface::asBinder(listener)->linkToDeath(mDeathRecipient); |
| if (err != NO_ERROR) { |
| ALOGE("cannot add callback because linkToDeath failed, err: %d", err); |
| return err; |
| } |
| } |
| |
| auto& transactionStatsDeque = mCompletedTransactions[listener]; |
| transactionStatsDeque.emplace_back(callbackIds); |
| return NO_ERROR; |
| } |
| |
| status_t TransactionCompletedThread::registerPendingCallbackHandle( |
| const sp<CallbackHandle>& handle) { |
| std::lock_guard lock(mMutex); |
| if (!mRunning) { |
| ALOGE("cannot register callback handle because the callback thread isn't running"); |
| return BAD_VALUE; |
| } |
| |
| // If we can't find the transaction stats something has gone wrong. The client should call |
| // addCallback before trying to register a pending callback handle. |
| TransactionStats* transactionStats; |
| status_t err = findTransactionStats(handle->listener, handle->callbackIds, &transactionStats); |
| if (err != NO_ERROR) { |
| ALOGE("cannot find transaction stats"); |
| return err; |
| } |
| |
| mPendingTransactions[handle->listener][handle->callbackIds]++; |
| return NO_ERROR; |
| } |
| |
| status_t TransactionCompletedThread::addPresentedCallbackHandles( |
| const std::deque<sp<CallbackHandle>>& handles) { |
| std::lock_guard lock(mMutex); |
| if (!mRunning) { |
| ALOGE("cannot add presented callback handle because the callback thread isn't running"); |
| return BAD_VALUE; |
| } |
| |
| for (const auto& handle : handles) { |
| auto listener = mPendingTransactions.find(handle->listener); |
| if (listener != mPendingTransactions.end()) { |
| auto& pendingCallbacks = listener->second; |
| auto pendingCallback = pendingCallbacks.find(handle->callbackIds); |
| |
| if (pendingCallback != pendingCallbacks.end()) { |
| auto& pendingCount = pendingCallback->second; |
| |
| // Decrease the pending count for this listener |
| if (--pendingCount == 0) { |
| pendingCallbacks.erase(pendingCallback); |
| } |
| } else { |
| ALOGW("there are more latched callbacks than there were registered callbacks"); |
| } |
| if (listener->second.size() == 0) { |
| mPendingTransactions.erase(listener); |
| } |
| } else { |
| ALOGW("cannot find listener in mPendingTransactions"); |
| } |
| |
| status_t err = addCallbackHandle(handle); |
| if (err != NO_ERROR) { |
| ALOGE("could not add callback handle"); |
| return err; |
| } |
| } |
| |
| return NO_ERROR; |
| } |
| |
| status_t TransactionCompletedThread::addUnpresentedCallbackHandle( |
| const sp<CallbackHandle>& handle) { |
| std::lock_guard lock(mMutex); |
| if (!mRunning) { |
| ALOGE("cannot add unpresented callback handle because the callback thread isn't running"); |
| return BAD_VALUE; |
| } |
| |
| return addCallbackHandle(handle); |
| } |
| |
| status_t TransactionCompletedThread::findTransactionStats( |
| const sp<ITransactionCompletedListener>& listener, |
| const std::vector<CallbackId>& callbackIds, TransactionStats** outTransactionStats) { |
| auto& transactionStatsDeque = mCompletedTransactions[listener]; |
| |
| // Search back to front because the most recent transactions are at the back of the deque |
| auto itr = transactionStatsDeque.rbegin(); |
| for (; itr != transactionStatsDeque.rend(); itr++) { |
| if (compareCallbackIds(itr->callbackIds, callbackIds) == 0) { |
| *outTransactionStats = &(*itr); |
| return NO_ERROR; |
| } |
| } |
| |
| ALOGE("could not find transaction stats"); |
| return BAD_VALUE; |
| } |
| |
| status_t TransactionCompletedThread::addCallbackHandle(const sp<CallbackHandle>& handle) { |
| // If we can't find the transaction stats something has gone wrong. The client should call |
| // addCallback before trying to add a presnted callback handle. |
| TransactionStats* transactionStats; |
| status_t err = findTransactionStats(handle->listener, handle->callbackIds, &transactionStats); |
| if (err != NO_ERROR) { |
| return err; |
| } |
| |
| transactionStats->latchTime = handle->latchTime; |
| // If the layer has already been destroyed, don't add the SurfaceControl to the callback. |
| // The client side keeps a sp<> to the SurfaceControl so if the SurfaceControl has been |
| // destroyed the client side is dead and there won't be anyone to send the callback to. |
| sp<IBinder> surfaceControl = handle->surfaceControl.promote(); |
| if (surfaceControl) { |
| transactionStats->surfaceStats.emplace_back(surfaceControl, handle->acquireTime, |
| handle->previousReleaseFence); |
| } |
| return NO_ERROR; |
| } |
| |
| void TransactionCompletedThread::addPresentFence(const sp<Fence>& presentFence) { |
| std::lock_guard<std::mutex> lock(mMutex); |
| mPresentFence = presentFence; |
| } |
| |
| void TransactionCompletedThread::sendCallbacks() { |
| std::lock_guard lock(mMutex); |
| if (mRunning) { |
| mConditionVariable.notify_all(); |
| } |
| } |
| |
| void TransactionCompletedThread::threadMain() { |
| std::lock_guard lock(mMutex); |
| |
| while (mKeepRunning) { |
| mConditionVariable.wait(mMutex); |
| std::vector<ListenerStats> completedListenerStats; |
| |
| // For each listener |
| auto completedTransactionsItr = mCompletedTransactions.begin(); |
| while (completedTransactionsItr != mCompletedTransactions.end()) { |
| auto& [listener, transactionStatsDeque] = *completedTransactionsItr; |
| ListenerStats listenerStats; |
| listenerStats.listener = listener; |
| |
| // For each transaction |
| auto transactionStatsItr = transactionStatsDeque.begin(); |
| while (transactionStatsItr != transactionStatsDeque.end()) { |
| auto& transactionStats = *transactionStatsItr; |
| |
| // If we are still waiting on the callback handles for this transaction, stop |
| // here because all transaction callbacks for the same listener must come in order |
| auto pendingTransactions = mPendingTransactions.find(listener); |
| if (pendingTransactions != mPendingTransactions.end() && |
| pendingTransactions->second.count(transactionStats.callbackIds) != 0) { |
| break; |
| } |
| |
| // If the transaction has been latched |
| if (transactionStats.latchTime >= 0) { |
| if (!mPresentFence) { |
| break; |
| } |
| transactionStats.presentFence = mPresentFence; |
| } |
| |
| // Remove the transaction from completed to the callback |
| listenerStats.transactionStats.push_back(std::move(transactionStats)); |
| transactionStatsItr = transactionStatsDeque.erase(transactionStatsItr); |
| } |
| // If the listener has completed transactions |
| if (!listenerStats.transactionStats.empty()) { |
| // If the listener is still alive |
| if (IInterface::asBinder(listener)->isBinderAlive()) { |
| // Send callback |
| listenerStats.listener->onTransactionCompleted(listenerStats); |
| IInterface::asBinder(listener)->unlinkToDeath(mDeathRecipient); |
| } |
| completedTransactionsItr = mCompletedTransactions.erase(completedTransactionsItr); |
| } else { |
| completedTransactionsItr++; |
| } |
| |
| completedListenerStats.push_back(std::move(listenerStats)); |
| } |
| |
| if (mPresentFence) { |
| mPresentFence.clear(); |
| } |
| |
| // If everyone else has dropped their reference to a layer and its listener is dead, |
| // we are about to cause the layer to be deleted. If this happens at the wrong time and |
| // we are holding mMutex, we will cause a deadlock. |
| // |
| // The deadlock happens because this thread is holding on to mMutex and when we delete |
| // the layer, it grabs SF's mStateLock. A different SF binder thread grabs mStateLock, |
| // then call's TransactionCompletedThread::run() which tries to grab mMutex. |
| // |
| // To avoid this deadlock, we need to unlock mMutex when dropping our last reference to |
| // to the layer. |
| mMutex.unlock(); |
| completedListenerStats.clear(); |
| mMutex.lock(); |
| } |
| } |
| |
| // ----------------------------------------------------------------------- |
| |
| CallbackHandle::CallbackHandle(const sp<ITransactionCompletedListener>& transactionListener, |
| const std::vector<CallbackId>& ids, const sp<IBinder>& sc) |
| : listener(transactionListener), callbackIds(ids), surfaceControl(sc) {} |
| |
| } // namespace android |