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125 lines
3.5 KiB
125 lines
3.5 KiB
/**
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* Copyright (C) 2021 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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#include "EvsCallbackThread.h"
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#include <android-base/logging.h>
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namespace android {
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namespace automotive {
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namespace evs {
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EvsCallbackThread::EvsCallbackThread(JavaVM* vm) :
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mVm(vm), mRunning(true), mThread(&EvsCallbackThread::threadLoop, this) {
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LOG(DEBUG) << "Started the native callback handler thread = " << this;
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}
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EvsCallbackThread::~EvsCallbackThread() {
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// Stops the loop
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stop();
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}
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void EvsCallbackThread::threadLoop() {
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// Attaches the current thread to the Java VM.
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JNIEnv* env = nullptr;
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JavaVMAttachArgs args = {JNI_VERSION_1_4, "EvsCallbackThread", nullptr};
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if (mVm->AttachCurrentThread(&env, &args) != JNI_OK || env == nullptr) {
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LOG(ERROR) << "Failed to be attached to the VM.";
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mRunning = false;
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return;
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}
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while (true) {
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Task task;
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{
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std::unique_lock<std::mutex> lock(mLock);
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if (!mRunning) {
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break;
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}
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if (mTaskQueue.empty()) {
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mCondition.wait(lock);
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// The conditional variable is signalled when either a new task
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// is enqueued or we are requested to stop. If we wake up
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// spuriously, the task queue must be empty so go back to sleep.
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if (!mRunning) {
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break;
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} else if (mTaskQueue.empty()) {
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LOG(DEBUG) << "No pending tasks; continue.";
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continue;
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}
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}
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task = mTaskQueue.front();
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mTaskQueue.pop();
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}
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// Executes the task and check the exception
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task(env);
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if (env->ExceptionCheck()) {
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LOG(ERROR) << "Exception happens while handling a task:";
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env->ExceptionDescribe();
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env->ExceptionClear();
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}
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}
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auto res = mVm->DetachCurrentThread();
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if (res != JNI_OK) {
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LOG(WARNING) << "Failed to be detached from the VM.";
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}
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if (!mTaskQueue.empty()) {
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LOG(WARNING) << mTaskQueue.size() << " tasks are ignored.";
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}
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LOG(DEBUG) << "Exiting a callback handler thread.";
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}
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void EvsCallbackThread::enqueue(const Task& task) {
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std::lock_guard<std::mutex> lock(mLock);
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if (!mRunning) {
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LOG(WARNING) << "A callback handler thread is not running.";
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return;
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}
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mTaskQueue.push(task);
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mCondition.notify_one();
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}
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void EvsCallbackThread::stop() {
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{
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std::lock_guard<std::mutex> lock(mLock);
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if (!mRunning) {
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// Nothing to do if the handler thread is not running.
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return;
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}
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mRunning = false;
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mCondition.notify_all();
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}
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if (mThread.get_id() == std::this_thread::get_id()) {
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// Should not join by myself
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mThread.detach();
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} else if (mThread.joinable()) {
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mThread.join();
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}
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}
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} // namespace evs
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} // namespace automotive
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} // namespace android
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