107 lines
3.8 KiB
C++
107 lines
3.8 KiB
C++
/*
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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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#define LOG_TAG "AAudioCommandQueue"
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//#define LOG_NDEBUG 0
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#include <chrono>
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#include <utils/Log.h>
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#include "AAudioCommandQueue.h"
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namespace aaudio {
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aaudio_result_t AAudioCommandQueue::sendCommand(std::shared_ptr<AAudioCommand> command) {
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{
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std::scoped_lock<std::mutex> _l(mLock);
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if (!mRunning) {
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ALOGE("Tried to send command while it was not running");
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return AAUDIO_ERROR_INVALID_STATE;
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}
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mCommands.push(command);
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mWaitWorkCond.notify_one();
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}
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std::unique_lock _cl(command->lock);
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android::base::ScopedLockAssertion lockAssertion(command->lock);
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ALOGV("Sending command %d, wait for reply(%d) with timeout %jd",
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command->operationCode, command->isWaitingForReply, command->timeoutNanoseconds);
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// `mWaitForReply` is first initialized when the command is constructed. It will be flipped
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// when the command is completed.
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auto timeoutExpire = std::chrono::steady_clock::now()
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+ std::chrono::nanoseconds(command->timeoutNanoseconds);
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while (command->isWaitingForReply) {
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if (command->conditionVariable.wait_until(_cl, timeoutExpire)
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== std::cv_status::timeout) {
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ALOGD("Command %d time out", command->operationCode);
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command->result = AAUDIO_ERROR_TIMEOUT;
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command->isWaitingForReply = false;
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}
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}
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ALOGV("Command %d sent with result as %d", command->operationCode, command->result);
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return command->result;
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}
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std::shared_ptr<AAudioCommand> AAudioCommandQueue::waitForCommand(int64_t timeoutNanos) {
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std::shared_ptr<AAudioCommand> command;
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{
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std::unique_lock _l(mLock);
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android::base::ScopedLockAssertion lockAssertion(mLock);
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if (timeoutNanos >= 0) {
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mWaitWorkCond.wait_for(_l, std::chrono::nanoseconds(timeoutNanos), [this]() {
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android::base::ScopedLockAssertion lockAssertion(mLock);
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return !mRunning || !mCommands.empty();
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});
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} else {
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mWaitWorkCond.wait(_l, [this]() {
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android::base::ScopedLockAssertion lockAssertion(mLock);
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return !mRunning || !mCommands.empty();
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});
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}
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if (!mCommands.empty() && mRunning) {
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command = mCommands.front();
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mCommands.pop();
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}
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}
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return command;
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}
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void AAudioCommandQueue::startWaiting() {
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std::scoped_lock<std::mutex> _l(mLock);
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mRunning = true;
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}
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void AAudioCommandQueue::stopWaiting() {
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std::scoped_lock<std::mutex> _l(mLock);
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mRunning = false;
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// Clear all commands in the queue as the command thread is stopped.
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while (!mCommands.empty()) {
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auto command = mCommands.front();
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mCommands.pop();
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std::scoped_lock<std::mutex> _cl(command->lock);
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// If the command is waiting for result, returns AAUDIO_ERROR_INVALID_STATE
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// as there is no thread waiting for the command.
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if (command->isWaitingForReply) {
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command->result = AAUDIO_ERROR_INVALID_STATE;
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command->isWaitingForReply = false;
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command->conditionVariable.notify_one();
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}
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}
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mWaitWorkCond.notify_one();
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}
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} // namespace aaudio
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