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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef GECKO_TASK_TRACER_H
#define GECKO_TASK_TRACER_H
#include "mozilla/UniquePtr.h"
#include "nsCOMPtr.h"
#include "nsTArrayForwardDeclare.h"
/**
* TaskTracer provides a way to trace the correlation between different tasks
* across threads and processes. Unlike sampling based profilers, TaskTracer can
* tell you where a task is dispatched from, what its original source was, how
* long it waited in the event queue, and how long it took to execute.
*
* Source Events are usually some kinds of I/O events we're interested in, such
* as touch events, timer events, network events, etc. When a source event is
* created, TaskTracer records the entire chain of Tasks and nsRunnables as they
* are dispatched to different threads and processes. It records latency,
* execution time, etc. for each Task and nsRunnable that chains back to the
* original source event.
*/
class Task;
class nsIRunnable;
class nsCString;
namespace mozilla {
class TimeStamp;
namespace tasktracer {
enum {
FORKED_AFTER_NUWA = 1 << 0
};
enum SourceEventType {
Unknown = 0,
Touch,
Mouse,
Key,
Bluetooth,
Unixsocket,
Wifi
};
class AutoSourceEvent
{
public:
AutoSourceEvent(SourceEventType aType);
~AutoSourceEvent();
};
void InitTaskTracer(uint32_t aFlags = 0);
void ShutdownTaskTracer();
// Add a label to the currently running task, aFormat is the message to log,
// followed by corresponding parameters.
void AddLabel(const char* aFormat, ...);
void StartLogging();
void StopLogging();
UniquePtr<nsTArray<nsCString>> GetLoggedData(TimeStamp aStartTime);
// Returns the timestamp when Task Tracer is enabled in this process.
const PRTime GetStartTime();
/**
* Internal functions.
*/
Task* CreateTracedTask(Task* aTask);
already_AddRefed<nsIRunnable>
CreateTracedRunnable(already_AddRefed<nsIRunnable>&& aRunnable);
// Free the TraceInfo allocated on a thread's TLS. Currently we are wrapping
// tasks running on nsThreads and base::thread, so FreeTraceInfo is called at
// where nsThread and base::thread release themselves.
void FreeTraceInfo();
const char* GetJSLabelPrefix();
} // namespace tasktracer
} // namespace mozilla.
#endif
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