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108 lines
3.3 KiB
108 lines
3.3 KiB
/*
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* Copyright (C) 2016 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 <condition_variable>
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#include <chrono>
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#include <functional>
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#include <mutex>
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#include <thread>
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#include <hidl/Status.h>
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namespace android {
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namespace lshal {
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static constexpr std::chrono::milliseconds IPC_CALL_WAIT{500};
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class BackgroundTaskState {
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public:
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explicit BackgroundTaskState(std::function<void(void)> &&func)
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: mFunc(std::forward<decltype(func)>(func)) {}
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void notify() {
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std::unique_lock<std::mutex> lock(mMutex);
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mFinished = true;
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lock.unlock();
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mCondVar.notify_all();
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}
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template<class C, class D>
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bool wait(std::chrono::time_point<C, D> end) {
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std::unique_lock<std::mutex> lock(mMutex);
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mCondVar.wait_until(lock, end, [this](){ return this->mFinished; });
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return mFinished;
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}
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void operator()() {
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mFunc();
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}
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private:
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std::mutex mMutex;
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std::condition_variable mCondVar;
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bool mFinished = false;
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std::function<void(void)> mFunc;
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};
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void *callAndNotify(void *data) {
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BackgroundTaskState &state = *static_cast<BackgroundTaskState *>(data);
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state();
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state.notify();
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return nullptr;
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}
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template<class R, class P>
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bool timeout(std::chrono::duration<R, P> delay, std::function<void(void)> &&func) {
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auto now = std::chrono::system_clock::now();
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BackgroundTaskState state{std::forward<decltype(func)>(func)};
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pthread_t thread;
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if (pthread_create(&thread, nullptr, callAndNotify, &state)) {
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std::cerr << "FATAL: could not create background thread." << std::endl;
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return false;
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}
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bool success = state.wait(now + delay);
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if (!success) {
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pthread_kill(thread, SIGINT);
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}
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pthread_join(thread, nullptr);
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return success;
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}
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template<class R, class P, class Function, class I, class... Args>
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typename std::result_of<Function(I *, Args...)>::type
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timeoutIPC(std::chrono::duration<R, P> wait, const sp<I> &interfaceObject, Function &&func,
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Args &&... args) {
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using ::android::hardware::Status;
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typename std::result_of<Function(I *, Args...)>::type ret{Status::ok()};
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auto boundFunc = std::bind(std::forward<Function>(func),
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interfaceObject.get(), std::forward<Args>(args)...);
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bool success = timeout(wait, [&ret, &boundFunc] {
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ret = std::move(boundFunc());
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});
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if (!success) {
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return Status::fromStatusT(TIMED_OUT);
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}
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return ret;
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}
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template<class Function, class I, class... Args>
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typename std::result_of<Function(I *, Args...)>::type
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timeoutIPC(const sp<I> &interfaceObject, Function &&func, Args &&... args) {
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return timeoutIPC(IPC_CALL_WAIT, interfaceObject, func, args...);
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}
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} // namespace lshal
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} // namespace android
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