chromium/third_party/perfetto/src/base/metatrace.cc

/*
 * Copyright (C) 2018 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/ext/base/metatrace.h"

#include "perfetto/base/compiler.h"
#include "perfetto/base/task_runner.h"
#include "perfetto/base/time.h"
#include "perfetto/ext/base/file_utils.h"
#include "perfetto/ext/base/thread_annotations.h"

namespace perfetto {
namespace metatrace {

std::atomic<uint32_t> g_enabled_tags{ … };
std::atomic<uint64_t> g_enabled_timestamp{ … };

// static members
std::array<Record, RingBuffer::kCapacity> RingBuffer::records_;
std::atomic<bool> RingBuffer::read_task_queued_;
std::atomic<uint64_t> RingBuffer::wr_index_;
std::atomic<uint64_t> RingBuffer::rd_index_;
std::atomic<bool> RingBuffer::has_overruns_;
Record RingBuffer::bankruptcy_record_;

namespace {

// std::function<> is not trivially de/constructible. This struct wraps it in a
// heap-allocated struct to avoid static initializers.
struct Delegate { … };

}  // namespace

bool Enable(std::function<void()> read_task,
            base::TaskRunner* task_runner,
            uint32_t tags) { … }

void Disable() { … }

// static
void RingBuffer::Reset() { … }

// static
Record* RingBuffer::AppendNewRecord() { … }

// static
bool RingBuffer::IsOnValidTaskRunner() { … }

}  // namespace metatrace
}  // namespace perfetto