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87 lines
2.6 KiB
87 lines
2.6 KiB
4 months ago
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/*
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* Copyright (C) 2020 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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// This example demonstrates system-wide tracing with Perfetto.
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#include "trace_categories.h"
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#include <chrono>
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#include <condition_variable>
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#include <fstream>
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#include <thread>
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class Observer : public perfetto::TrackEventSessionObserver {
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public:
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Observer() { perfetto::TrackEvent::AddSessionObserver(this); }
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~Observer() { perfetto::TrackEvent::RemoveSessionObserver(this); }
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void OnStart(const perfetto::DataSourceBase::StartArgs&) override {
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std::unique_lock<std::mutex> lock(mutex);
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cv.notify_one();
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}
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void WaitForTracingStart() {
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PERFETTO_LOG("Waiting for tracing to start...");
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std::unique_lock<std::mutex> lock(mutex);
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cv.wait(lock, [] { return perfetto::TrackEvent::IsEnabled(); });
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PERFETTO_LOG("Tracing started");
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}
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std::mutex mutex;
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std::condition_variable cv;
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};
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void InitializePerfetto() {
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perfetto::TracingInitArgs args;
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// The backends determine where trace events are recorded. For this example we
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// are going to use the system-wide tracing service, so that we can see our
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// app's events in context with system profiling information.
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args.backends = perfetto::kSystemBackend;
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perfetto::Tracing::Initialize(args);
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perfetto::TrackEvent::Register();
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}
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void DrawPlayer(int player_number) {
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TRACE_EVENT("rendering", "DrawPlayer", "player_number", player_number);
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// Sleep to simulate a long computation.
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std::this_thread::sleep_for(std::chrono::milliseconds(500));
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}
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void DrawGame() {
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TRACE_EVENT("rendering", "DrawGame");
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DrawPlayer(1);
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DrawPlayer(2);
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}
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int main(int, const char**) {
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InitializePerfetto();
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Observer observer;
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observer.WaitForTracingStart();
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// Simulate some work that emits trace events.
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// Note that we don't start and stop tracing here; for system-wide tracing
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// this needs to be done through the "perfetto" command line tool or the
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// Perfetto UI (https://ui.perfetto.dev).
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DrawGame();
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// Make sure the last event is closed for this example.
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perfetto::TrackEvent::Flush();
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return 0;
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}
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