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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_BASE_SCOPED_ASYNC_TRACE_H_
#define MEDIA_BASE_SCOPED_ASYNC_TRACE_H_
#include <memory>
#include "base/macros.h"
#include "media/base/media_export.h"
namespace media {
// Utility class that starts and stops an async trace event. The intention is
// that it it will be created somewhere to start the trace event, passed around
// such as via unique_ptr argument in a callback, and eventually freed to end
// the trace event. This guarantees that it'll be closed, even if the callback
// is destroyed without being run.
class MEDIA_EXPORT ScopedAsyncTrace {
public:
// Create a ScopedAsyncTrace if tracing for "media" is enabled, else return
// nullptr. |name| provided to the trace as the name(!).
// IMPORTANT: These strings must outlive |this|, since tracing needs it. In
// other words, use literal strings only. See trace_event_common.h .
static std::unique_ptr<ScopedAsyncTrace> CreateIfEnabled(const char* name);
~ScopedAsyncTrace();
// TODO(liberato): Add StepInto / StepPast.
private:
explicit ScopedAsyncTrace(const char* name);
const char* name_ = nullptr;
DISALLOW_COPY_AND_ASSIGN(ScopedAsyncTrace);
};
} // namespace media
#endif // MEDIA_BASE_SCOPED_ASYNC_TRACE_H_
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