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// Copyright 2014 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 BASE_DEBUG_TASK_ANNOTATOR_H_
#define BASE_DEBUG_TASK_ANNOTATOR_H_
#include <stdint.h>
#include "base/base_export.h"
#include "base/macros.h"
namespace base {
struct PendingTask;
namespace debug {
// Implements common debug annotations for posted tasks. This includes data
// such as task origins, queueing durations and memory usage.
class BASE_EXPORT TaskAnnotator {
public:
TaskAnnotator();
~TaskAnnotator();
// Called to indicate that a task has been queued to run in the future.
// |queue_function| is used as the trace flow event name.
void DidQueueTask(const char* queue_function,
const PendingTask& pending_task);
// Run a previously queued task. |queue_function| should match what was
// passed into |DidQueueTask| for this task.
void RunTask(const char* queue_function, const PendingTask& pending_task);
private:
// Creates a process-wide unique ID to represent this task in trace events.
// This will be mangled with a Process ID hash to reduce the likelyhood of
// colliding with TaskAnnotator pointers on other processes.
uint64_t GetTaskTraceID(const PendingTask& task) const;
DISALLOW_COPY_AND_ASSIGN(TaskAnnotator);
};
#define TRACE_TASK_EXECUTION(run_function, task) \
TRACE_EVENT2("toplevel", (run_function), "src_file", \
(task).posted_from.file_name(), "src_func", \
(task).posted_from.function_name());
} // namespace debug
} // namespace base
#endif // BASE_DEBUG_TASK_ANNOTATOR_H_
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