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// Copyright 2015 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.
// This file contains the Windows-specific exporting to ETW.
#ifndef BASE_TRACE_EVENT_TRACE_ETW_EXPORT_H_
#define BASE_TRACE_EVENT_TRACE_ETW_EXPORT_H_
#include "base/base_export.h"
#include "base/trace_event/trace_event_impl.h"
// Fwd.
template <typename Type>
struct StaticMemorySingletonTraits;
namespace base {
namespace trace_event {
class BASE_EXPORT TraceEventETWExport {
public:
~TraceEventETWExport();
// Retrieves the singleton.
// Note that this may return NULL post-AtExit processing.
static TraceEventETWExport* GetInstance();
// Enables/disables exporting of events to ETW. If disabled,
// AddEvent and AddCustomEvent will simply return when called.
static void EnableETWExport();
static void DisableETWExport();
static bool isETWExportEnabled() { return GetInstance()->ETWExportEnabled_; }
// Exports an event to ETW. This is mainly used in
// TraceLog::AddTraceEventWithThreadIdAndTimestamp to export internal events.
static void AddEvent(
char phase,
const unsigned char* category_group_enabled,
const char* name,
unsigned long long id,
int num_args,
const char** arg_names,
const unsigned char* arg_types,
const unsigned long long* arg_values,
const scoped_refptr<ConvertableToTraceFormat>* convertable_values);
// Exports an event to ETW. This should be used when exporting an event only
// to ETW. Supports three arguments to be passed to ETW.
// TODO(georgesak): Allow different providers.
static void AddCustomEvent(const char* name,
char const* phase,
const char* arg_name_1,
const char* arg_value_1,
const char* arg_name_2,
const char* arg_value_2,
const char* arg_name_3,
const char* arg_value_3);
void Resurrect();
private:
bool ETWExportEnabled_;
// Ensure only the provider can construct us.
friend struct StaticMemorySingletonTraits<TraceEventETWExport>;
TraceEventETWExport();
DISALLOW_COPY_AND_ASSIGN(TraceEventETWExport);
};
} // namespace trace_event
} // namespace base
#endif // BASE_TRACE_EVENT_TRACE_ETW_EXPORT_H_
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