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/*
* Copyright (C) 2021 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 "ProtectCallback.h"
#include <android-base/logging.h>
#include <android-base/scopeguard.h>
#include <android-base/thread_annotations.h>
#include <android/binder_auto_utils.h>
#include <android/binder_interface_utils.h>
#include <nnapi/Result.h>
#include <algorithm>
#include <functional>
#include <memory>
#include <mutex>
#include <vector>
#include "Utils.h"
namespace aidl::android::hardware::neuralnetworks::utils {
void DeathMonitor::serviceDied() {
std::lock_guard guard(mMutex);
std::for_each(mObjects.begin(), mObjects.end(),
[](IProtectedCallback* killable) { killable->notifyAsDeadObject(); });
}
void DeathMonitor::serviceDied(void* cookie) {
auto deathMonitor = static_cast<DeathMonitor*>(cookie);
deathMonitor->serviceDied();
}
void DeathMonitor::add(IProtectedCallback* killable) const {
CHECK(killable != nullptr);
std::lock_guard guard(mMutex);
mObjects.push_back(killable);
}
void DeathMonitor::remove(IProtectedCallback* killable) const {
CHECK(killable != nullptr);
std::lock_guard guard(mMutex);
const auto removedIter = std::remove(mObjects.begin(), mObjects.end(), killable);
mObjects.erase(removedIter);
}
nn::GeneralResult<DeathHandler> DeathHandler::create(std::shared_ptr<ndk::ICInterface> object) {
if (object == nullptr) {
return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
<< "utils::DeathHandler::create must have non-null object";
}
auto deathMonitor = std::make_shared<DeathMonitor>();
auto deathRecipient = ndk::ScopedAIBinder_DeathRecipient(
AIBinder_DeathRecipient_new(DeathMonitor::serviceDied));
// If passed a local binder, AIBinder_linkToDeath will do nothing and return
// STATUS_INVALID_OPERATION. We ignore this case because we only use local binders in tests
// where this is not an error.
if (object->isRemote()) {
const auto ret = ndk::ScopedAStatus::fromStatus(AIBinder_linkToDeath(
object->asBinder().get(), deathRecipient.get(), deathMonitor.get()));
HANDLE_ASTATUS(ret) << "AIBinder_linkToDeath failed";
}
return DeathHandler(std::move(object), std::move(deathRecipient), std::move(deathMonitor));
}
DeathHandler::DeathHandler(std::shared_ptr<ndk::ICInterface> object,
ndk::ScopedAIBinder_DeathRecipient deathRecipient,
std::shared_ptr<DeathMonitor> deathMonitor)
: kObject(std::move(object)),
kDeathRecipient(std::move(deathRecipient)),
kDeathMonitor(std::move(deathMonitor)) {
CHECK(kObject != nullptr);
CHECK(kDeathRecipient.get() != nullptr);
CHECK(kDeathMonitor != nullptr);
}
DeathHandler::~DeathHandler() {
if (kObject != nullptr && kDeathRecipient.get() != nullptr && kDeathMonitor != nullptr) {
const auto ret = ndk::ScopedAStatus::fromStatus(AIBinder_unlinkToDeath(
kObject->asBinder().get(), kDeathRecipient.get(), kDeathMonitor.get()));
const auto maybeSuccess = handleTransportError(ret);
if (!maybeSuccess.ok()) {
LOG(ERROR) << maybeSuccess.error().message;
}
}
}
[[nodiscard]] ::android::base::ScopeGuard<DeathHandler::Cleanup> DeathHandler::protectCallback(
IProtectedCallback* killable) const {
CHECK(killable != nullptr);
kDeathMonitor->add(killable);
return ::android::base::make_scope_guard(
[deathMonitor = kDeathMonitor, killable] { deathMonitor->remove(killable); });
}
} // namespace aidl::android::hardware::neuralnetworks::utils
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