chromium/third_party/perfetto/src/tracing/core/trace_writer_impl.h

/*
 * 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 SRC_TRACING_CORE_TRACE_WRITER_IMPL_H_
#define SRC_TRACING_CORE_TRACE_WRITER_IMPL_H_

#include "perfetto/base/proc_utils.h"
#include "perfetto/ext/tracing/core/basic_types.h"
#include "perfetto/ext/tracing/core/shared_memory_abi.h"
#include "perfetto/ext/tracing/core/shared_memory_arbiter.h"
#include "perfetto/ext/tracing/core/trace_writer.h"
#include "perfetto/protozero/message_handle.h"
#include "perfetto/protozero/proto_utils.h"
#include "perfetto/protozero/root_message.h"
#include "perfetto/protozero/scattered_stream_writer.h"
#include "perfetto/tracing/buffer_exhausted_policy.h"
#include "src/tracing/core/patch_list.h"

namespace perfetto {

class SharedMemoryArbiterImpl;

// See //include/perfetto/ext/tracing/core/trace_writer.h for docs.
//
// Locking will happen only when a chunk is exhausted and a new one is
// acquired from the arbiter.
//
// TODO: TraceWriter needs to keep the shared memory buffer alive (refcount?).
// Otherwise if the shared memory buffer goes away (e.g. the Service crashes)
// the TraceWriter will keep writing into unmapped memory.
//
class TraceWriterImpl : public TraceWriter,
                        public protozero::MessageFinalizationListener,
                        public protozero::ScatteredStreamWriter::Delegate {};

}  // namespace perfetto

#endif  // SRC_TRACING_CORE_TRACE_WRITER_IMPL_H_