in_process_tracing_backend.cc | Explore in Territory

/*
 * 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/internal/in_process_tracing_backend.h"

#include "perfetto/base/logging.h"
#include "perfetto/base/task_runner.h"
#include "perfetto/ext/base/paged_memory.h"
#include "perfetto/ext/tracing/core/client_identity.h"
#include "perfetto/ext/tracing/core/shared_memory.h"
#include "perfetto/ext/tracing/core/tracing_service.h"

#include "src/tracing/core/in_process_shared_memory.h"

// TODO(primiano): When the in-process backend is used, we should never end up
// in a situation where the thread where the TracingService and Producer live
// writes a packet and hence can get into the GetNewChunk() stall.
// This would happen only if the API client code calls Trace() from one of the
// callbacks it receives (e.g. OnStart(), OnStop()). We should either cause a
// hard crash or ignore traces from that thread if that happens, because it
// will deadlock (the Service will never free up the SMB because won't ever get
// to run the task).

namespace perfetto {
namespace internal {

// static
TracingBackend* InProcessTracingBackend::GetInstance() { … }

InProcessTracingBackend::InProcessTracingBackend() = default;
InProcessTracingBackend::~InProcessTracingBackend() = default;

std::unique_ptr<ProducerEndpoint> InProcessTracingBackend::ConnectProducer(
    const ConnectProducerArgs& args) { … }

std::unique_ptr<ConsumerEndpoint> InProcessTracingBackend::ConnectConsumer(
    const ConnectConsumerArgs& args) { … }

TracingService* InProcessTracingBackend::GetOrCreateService(
    base::TaskRunner* task_runner) { … }

}  // namespace internal
}  // namespace perfetto
chromium/third_party/perfetto/src/tracing/internal/in_process_tracing_backend.cc
