| /* |
| * Copyright (C) 2019 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. |
| */ |
| |
| #include "perfetto/tracing.h" |
| |
| #include <thread> |
| |
| #include "protos/perfetto/trace/test_event.pbzero.h" |
| #include "protos/perfetto/trace/trace_packet.pbzero.h" |
| |
| // Deliberately not pulling any non-public perfetto header to spot accidental |
| // header public -> non-public dependency while building this file. |
| |
| namespace { |
| |
| class MyDataSource : public perfetto::DataSource<MyDataSource> { |
| public: |
| void OnSetup(const SetupArgs& args) override { |
| // This can be used to access the domain-specific DataSourceConfig, via |
| // args.config->xxx_config_raw(). |
| PERFETTO_ILOG("OnSetup called, name: %s", args.config->name().c_str()); |
| } |
| |
| void OnStart(const StartArgs&) override { PERFETTO_ILOG("OnStart called"); } |
| |
| void OnStop(const StopArgs& args) override { |
| PERFETTO_ILOG("OnStop called"); |
| |
| // Demonstrates the ability to defer stop and handle it asynchronously, |
| // writing data at the very end of the trace. |
| auto stop_closure = args.HandleStopAsynchronously(); |
| std::thread another_thread([stop_closure] { |
| sleep(2); |
| MyDataSource::Trace([](MyDataSource::TraceContext ctx) { |
| PERFETTO_LOG("Tracing lambda called while stopping"); |
| auto packet = ctx.NewTracePacket(); |
| packet->set_for_testing()->set_str("event recorded while stopping"); |
| packet->Finalize(); // Required because of the Flush below. |
| |
| // This explicit Flush() is required because the service doesn't issue |
| // any other flush requests after the Stop() signal. |
| ctx.Flush(); |
| }); |
| stop_closure(); |
| }); |
| another_thread.detach(); |
| } |
| }; |
| |
| } // namespace |
| |
| PERFETTO_DEFINE_DATA_SOURCE_STATIC_MEMBERS(MyDataSource); |
| |
| int main() { |
| perfetto::TracingInitArgs args; |
| args.backends = perfetto::kSystemBackend; |
| perfetto::Tracing::Initialize(args); |
| |
| // DataSourceDescriptor can be used to advertise domain-specific features. |
| perfetto::DataSourceDescriptor dsd; |
| dsd.set_name("com.example.mytrace"); |
| MyDataSource::Register(dsd); |
| |
| for (;;) { |
| MyDataSource::Trace([](MyDataSource::TraceContext ctx) { |
| PERFETTO_LOG("Tracing lambda called"); |
| auto packet = ctx.NewTracePacket(); |
| packet->set_timestamp(42); |
| packet->set_for_testing()->set_str("event 1"); |
| }); |
| sleep(1); |
| } |
| } |