81 lines
1.9 KiB
C++
81 lines
1.9 KiB
C++
/*
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* Copyright 2019 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 "CPUTracer.h"
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#include <memory>
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#include "Trace.h"
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namespace swappy {
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CPUTracer::CPUTracer() {}
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CPUTracer::~CPUTracer() { joinThread(); }
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void CPUTracer::joinThread() {
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bool join = false;
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if (mThread && mThread->joinable()) {
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std::lock_guard<std::mutex> lock(mMutex);
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mTrace = false;
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mRunning = false;
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mCond.notify_one();
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join = true;
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}
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if (join) {
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mThread->join();
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}
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mThread.reset();
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}
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void CPUTracer::startTrace() {
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if (TRACE_ENABLED()) {
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std::lock_guard<std::mutex> lock(mMutex);
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if (!mThread) {
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mRunning = true;
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mThread = std::make_unique<Thread>([this]() { threadMain(); });
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}
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mTrace = true;
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mCond.notify_one();
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} else {
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joinThread();
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}
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}
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void CPUTracer::endTrace() {
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if (TRACE_ENABLED()) {
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std::lock_guard<std::mutex> lock(mMutex);
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mTrace = false;
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mCond.notify_one();
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} else {
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joinThread();
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}
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}
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void CPUTracer::threadMain() NO_THREAD_SAFETY_ANALYSIS {
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std::unique_lock<std::mutex> lock(mMutex);
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while (mRunning) {
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if (mTrace) {
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gamesdk::ScopedTrace trace("Swappy: CPU frame time");
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mCond.wait(lock);
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} else {
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mCond.wait(lock);
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}
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}
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}
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} // namespace swappy
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