815f2a093a
This prevents an issue where if the signal schedules hwuiTask it will immediately block and go back to sleep due to mLock still being held. This costs 10us in thread scheduling ping-ponging bouncing between hwuiTask and RenderThread Change-Id: I47595c1bf5736576483a6aa7aada0b1be1e04268
134 lines
3.4 KiB
C++
134 lines
3.4 KiB
C++
/*
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* Copyright (C) 2013 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 <sys/resource.h>
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#include <sys/sysinfo.h>
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#include "TaskManager.h"
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#include "Task.h"
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#include "TaskProcessor.h"
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#include "utils/MathUtils.h"
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namespace android {
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namespace uirenderer {
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///////////////////////////////////////////////////////////////////////////////
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// Manager
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///////////////////////////////////////////////////////////////////////////////
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TaskManager::TaskManager() {
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// Get the number of available CPUs. This value does not change over time.
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int cpuCount = sysconf(_SC_NPROCESSORS_CONF);
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int workerCount = MathUtils::max(1, cpuCount / 2);
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for (int i = 0; i < workerCount; i++) {
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String8 name;
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name.appendFormat("hwuiTask%d", i + 1);
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mThreads.add(new WorkerThread(name));
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}
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}
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TaskManager::~TaskManager() {
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for (size_t i = 0; i < mThreads.size(); i++) {
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mThreads[i]->exit();
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}
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}
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bool TaskManager::canRunTasks() const {
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return mThreads.size() > 0;
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}
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void TaskManager::stop() {
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for (size_t i = 0; i < mThreads.size(); i++) {
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mThreads[i]->exit();
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}
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}
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bool TaskManager::addTaskBase(const sp<TaskBase>& task, const sp<TaskProcessorBase>& processor) {
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if (mThreads.size() > 0) {
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TaskWrapper wrapper(task, processor);
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size_t minQueueSize = INT_MAX;
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sp<WorkerThread> thread;
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for (size_t i = 0; i < mThreads.size(); i++) {
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if (mThreads[i]->getTaskCount() < minQueueSize) {
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thread = mThreads[i];
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minQueueSize = mThreads[i]->getTaskCount();
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}
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}
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return thread->addTask(wrapper);
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}
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return false;
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}
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///////////////////////////////////////////////////////////////////////////////
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// Thread
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///////////////////////////////////////////////////////////////////////////////
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status_t TaskManager::WorkerThread::readyToRun() {
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setpriority(PRIO_PROCESS, 0, PRIORITY_FOREGROUND);
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return NO_ERROR;
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}
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bool TaskManager::WorkerThread::threadLoop() {
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mSignal.wait();
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Vector<TaskWrapper> tasks;
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{
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Mutex::Autolock l(mLock);
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tasks = mTasks;
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mTasks.clear();
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}
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for (size_t i = 0; i < tasks.size(); i++) {
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const TaskWrapper& task = tasks.itemAt(i);
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task.mProcessor->process(task.mTask);
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}
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return true;
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}
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bool TaskManager::WorkerThread::addTask(TaskWrapper task) {
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if (!isRunning()) {
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run(mName.string(), PRIORITY_DEFAULT);
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} else if (exitPending()) {
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return false;
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}
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ssize_t index;
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{
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Mutex::Autolock l(mLock);
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index = mTasks.add(task);
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}
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mSignal.signal();
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return index >= 0;
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}
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size_t TaskManager::WorkerThread::getTaskCount() const {
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Mutex::Autolock l(mLock);
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return mTasks.size();
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}
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void TaskManager::WorkerThread::exit() {
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requestExit();
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mSignal.signal();
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}
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}; // namespace uirenderer
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}; // namespace android
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