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| 1 | +/* |
| 2 | + * Copyright (C) 2021 The Android Open Source Project |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + * you may not use this file except in compliance with the License. |
| 6 | + * You may obtain a copy of the License at |
| 7 | + * |
| 8 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | + * |
| 10 | + * Unless required by applicable law or agreed to in writing, software |
| 11 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + * See the License for the specific language governing permissions and |
| 14 | + * limitations under the License. |
| 15 | + */ |
| 16 | + |
| 17 | +#define ATRACE_TAG (ATRACE_TAG_GRAPHICS | ATRACE_TAG_HAL) |
| 18 | + |
| 19 | +#include "Composer.h" |
| 20 | + |
| 21 | +#include <android-base/logging.h> |
| 22 | +#include <android/binder_ibinder_platform.h> |
| 23 | + |
| 24 | +#include "Util.h" |
| 25 | + |
| 26 | +namespace aidl::android::hardware::graphics::composer3::impl { |
| 27 | + |
| 28 | +ndk::ScopedAStatus Composer::createClient(std::shared_ptr<IComposerClient>* outClient) { |
| 29 | + DEBUG_FUNC(); |
| 30 | + std::unique_lock<std::mutex> lock(mClientMutex); |
| 31 | + if (!waitForClientDestroyedLocked(lock)) { |
| 32 | + *outClient = nullptr; |
| 33 | + return TO_BINDER_STATUS(EX_NO_RESOURCES); |
| 34 | + } |
| 35 | + |
| 36 | + auto client = ndk::SharedRefBase::make<ComposerClient>(mHal.get()); |
| 37 | + if (!client || !client->init()) { |
| 38 | + *outClient = nullptr; |
| 39 | + return TO_BINDER_STATUS(EX_NO_RESOURCES); |
| 40 | + } |
| 41 | + |
| 42 | + auto clientDestroyed = [this]() { onClientDestroyed(); }; |
| 43 | + client->setOnClientDestroyed(clientDestroyed); |
| 44 | + |
| 45 | + mClientAlive = true; |
| 46 | + *outClient = client; |
| 47 | + |
| 48 | + return ndk::ScopedAStatus::ok(); |
| 49 | +} |
| 50 | + |
| 51 | +binder_status_t Composer::dump(int fd, const char** /*args*/, uint32_t /*numArgs*/) { |
| 52 | + std::string output; |
| 53 | + mHal->dumpDebugInfo(&output); |
| 54 | + write(fd, output.c_str(), output.size()); |
| 55 | + return STATUS_OK; |
| 56 | +} |
| 57 | + |
| 58 | +ndk::ScopedAStatus Composer::getCapabilities(std::vector<Capability>* caps) { |
| 59 | + DEBUG_FUNC(); |
| 60 | + mHal->getCapabilities(caps); |
| 61 | + return ndk::ScopedAStatus::ok(); |
| 62 | +} |
| 63 | + |
| 64 | +bool Composer::waitForClientDestroyedLocked(std::unique_lock<std::mutex>& lock) { |
| 65 | + if (mClientAlive) { |
| 66 | + using namespace std::chrono_literals; |
| 67 | + |
| 68 | + // In surface flinger we delete a composer client on one thread and |
| 69 | + // then create a new client on another thread. Although surface |
| 70 | + // flinger ensures the calls are made in that sequence (destroy and |
| 71 | + // then create), sometimes the calls land in the composer service |
| 72 | + // inverted (create and then destroy). Wait for a brief period to |
| 73 | + // see if the existing client is destroyed. |
| 74 | + LOG(DEBUG) << "waiting for previous client to be destroyed"; |
| 75 | + mClientDestroyedCondition.wait_for(lock, 1s, |
| 76 | + [this]() -> bool { return !mClientAlive; }); |
| 77 | + if (mClientAlive) { |
| 78 | + LOG(DEBUG) << "previous client was not destroyed"; |
| 79 | + } |
| 80 | + } |
| 81 | + |
| 82 | + return !mClientAlive; |
| 83 | +} |
| 84 | + |
| 85 | +void Composer::onClientDestroyed() { |
| 86 | + std::lock_guard<std::mutex> lock(mClientMutex); |
| 87 | + mClientAlive = false; |
| 88 | + mClientDestroyedCondition.notify_all(); |
| 89 | +} |
| 90 | + |
| 91 | +::ndk::SpAIBinder Composer::createBinder() { |
| 92 | + auto binder = BnComposer::createBinder(); |
| 93 | + AIBinder_setInheritRt(binder.get(), true); |
| 94 | + return binder; |
| 95 | +} |
| 96 | + |
| 97 | +} // namespace aidl::android::hardware::graphics::composer3::impl |
| 98 | + |
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