Konsta
60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
/*
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* Copyright (C) 2023 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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#pragma once
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#include <memory>
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#include <utility>
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#include <android/binder_auto_utils.h>
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#include <android/binder_ibinder_platform.h>
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#include <system/thread_defs.h>
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namespace aidl::android::hardware::audio::core {
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// Helper used for interfaces that require a persistent instance. We hold them via a strong
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// pointer. The binder token is retained for a call to 'setMinSchedulerPolicy'.
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template <class C>
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struct ChildInterface : private std::pair<std::shared_ptr<C>, ndk::SpAIBinder> {
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ChildInterface() = default;
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ChildInterface& operator=(const std::shared_ptr<C>& c) {
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return operator=(std::shared_ptr<C>(c));
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}
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ChildInterface& operator=(std::shared_ptr<C>&& c) {
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this->first = std::move(c);
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return *this;
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}
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explicit operator bool() const { return !!this->first; }
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C& operator*() const { return *(this->first); }
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C* operator->() const { return this->first; }
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std::shared_ptr<C> getPtr() { return this->first; }
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// Use 'getInstance' when returning the interface instance.
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std::shared_ptr<C> getInstance() {
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(void)getBinder();
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return this->first;
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}
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AIBinder* getBinder() {
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if (this->second.get() == nullptr) {
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const auto binder = this->second = this->first->asBinder();
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AIBinder_setMinSchedulerPolicy(binder.get(), SCHED_NORMAL, ANDROID_PRIORITY_AUDIO);
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AIBinder_setInheritRt(binder.get(), true);
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}
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return this->second.get();
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}
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};
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} // namespace aidl::android::hardware::audio::core
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