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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef HWUI_THREADBASE_H
#define HWUI_THREADBASE_H
#include "WorkQueue.h"
#include "utils/Macros.h"
#include <utils/Looper.h>
#include <utils/Thread.h>
#include <algorithm>
namespace android::uirenderer {
class ThreadBase : public Thread {
PREVENT_COPY_AND_ASSIGN(ThreadBase);
public:
ThreadBase()
: Thread(false)
, mLooper(new Looper(false))
, mQueue([this]() { mLooper->wake(); }, mLock) {}
WorkQueue& queue() { return mQueue; }
void requestExit() {
Thread::requestExit();
mLooper->wake();
}
void start(const char* name = "ThreadBase") { Thread::run(name); }
void join() { Thread::join(); }
bool isRunning() const { return Thread::isRunning(); }
protected:
void waitForWork() {
nsecs_t nextWakeup;
{
std::unique_lock lock{mLock};
nextWakeup = mQueue.nextWakeup(lock);
}
int timeout = -1;
if (nextWakeup < std::numeric_limits<nsecs_t>::max()) {
timeout = ns2ms(nextWakeup - WorkQueue::clock::now());
if (timeout < 0) timeout = 0;
}
int result = mLooper->pollOnce(timeout);
LOG_ALWAYS_FATAL_IF(result == Looper::POLL_ERROR, "RenderThread Looper POLL_ERROR!");
}
void processQueue() { mQueue.process(); }
virtual bool threadLoop() override {
Looper::setForThread(mLooper);
while (!exitPending()) {
waitForWork();
processQueue();
}
Looper::setForThread(nullptr);
return false;
}
sp<Looper> mLooper;
private:
WorkQueue mQueue;
std::mutex mLock;
};
} // namespace android::uirenderer
#endif // HWUI_THREADBASE_H
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