mirror of
https://github.com/classilla/tenfourfox.git
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205 lines
5.4 KiB
C++
205 lines
5.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* A mechanism for interacting with operating system-provided
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* debugging/profiling tools such as Microsoft EWT/Windows Performance Toolkit.
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*/
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#ifndef mozilla_perfprobe_h
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#define mozilla_perfprobe_h
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#if !defined(XP_WIN)
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#error "For the moment, perfprobe.h is defined only for Windows platforms"
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#endif
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#include "nsError.h"
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#include "nsString.h"
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#include "mozilla/Logging.h"
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#include "nsTArray.h"
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#include "nsAutoPtr.h"
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#include <windows.h>
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#undef GetStartupInfo //Prevent Windows from polluting global namespace
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#include <wmistr.h>
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#include <evntrace.h>
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namespace mozilla {
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namespace probes {
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class ProbeManager;
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/**
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* A data structure supporting a trigger operation that can be used to
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* send information to the operating system.
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*/
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class Probe
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{
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public:
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NS_INLINE_DECL_REFCOUNTING(Probe)
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/**
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* Trigger the event.
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*
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* Note: Can be called from any thread.
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*/
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nsresult Trigger();
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protected:
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~Probe() {};
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Probe(const nsCID& aGUID, const nsACString& aName, ProbeManager* aManager);
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friend class ProbeManager;
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protected:
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/**
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* The system GUID associated to this probe. See the documentation
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* of |ProbeManager::Make| for more details.
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*/
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const GUID mGUID;
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/**
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* The name of this probe. See the documentation
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* of |ProbeManager::Make| for more details.
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*/
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const nsCString mName;
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/**
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* The ProbeManager managing this probe.
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*
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* Note: This is a weak reference to avoid a useless cycle.
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*/
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class ProbeManager* mManager;
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};
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/**
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* A manager for a group of probes.
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*
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* You can have several managers in one application, provided that they all
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* have distinct IDs and names. However, having more than 2 is considered a bad
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* practice.
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*/
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class ProbeManager
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{
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public:
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NS_INLINE_DECL_REFCOUNTING(ProbeManager)
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/**
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* Create a new probe manager.
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*
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* This constructor should be called from the main thread.
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*
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* @param aApplicationUID The unique ID of the probe. Under Windows, this
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* unique ID must have been previously registered using an external tool.
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* See MyCategory on http://msdn.microsoft.com/en-us/library/aa364100.aspx
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* @param aApplicationName A name for the probe. Currently used only for
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* logging purposes. In the future, may be attached to the data sent to the
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* operating system.
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*
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* Note: If two ProbeManagers are constructed with the same uid and/or name,
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* behavior is unspecified.
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*/
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ProbeManager(const nsCID& aApplicationUID,
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const nsACString& aApplicationName);
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/**
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* Acquire a probe.
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*
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* Note: Only probes acquired before the call to SetReady are taken into
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* account
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* Note: Can be called only from the main thread.
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*
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* @param aEventUID The unique ID of the probe. Under Windows, this unique
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* ID must have been previously registered using an external tool.
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* See MyCategory on http://msdn.microsoft.com/en-us/library/aa364100.aspx
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* @param aEventName A name for the probe. Currently used only for logging
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* purposes. In the
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* future, may be attached to the data sent to the operating system.
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* @return Either |null| in case of error or a valid |Probe*|.
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*
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* Note: If this method is called twice with the same uid and/or name,
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* behavior is undefined.
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*/
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already_AddRefed<Probe> GetProbe(const nsCID& aEventUID,
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const nsACString& aEventName);
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/**
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* Start/stop the measuring session.
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*
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* This method should be called from the main thread.
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*
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* Note that starting an already started probe manager has no effect,
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* nor does stopping an already stopped probe manager.
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*/
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nsresult StartSession();
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nsresult StopSession();
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/**
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* @return true If measures are currently on, i.e. if triggering probes is any
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* is useful. You do not have to check this before triggering a probe, unless
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* this can avoid complex computations.
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*/
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bool IsActive();
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protected:
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~ProbeManager();
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nsresult StartSession(nsTArray<RefPtr<Probe>>& aProbes);
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nsresult Init(const nsCID& aApplicationUID,
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const nsACString& aApplicationName);
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protected:
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/**
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* `true` if a session is in activity, `false` otherwise.
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*/
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bool mIsActive;
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/**
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* The UID of this manager.
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* See documentation above for registration steps that you
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* may have to take.
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*/
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nsCID mApplicationUID;
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/**
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* The name of the application.
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*/
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nsCString mApplicationName;
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/**
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* All the probes that have been created for this manager.
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*/
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nsTArray<RefPtr<Probe>> mAllProbes;
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/**
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* Handle used for triggering events
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*/
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TRACEHANDLE mSessionHandle;
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/**
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* Handle used for registration/unregistration
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*/
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TRACEHANDLE mRegistrationHandle;
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/**
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* `true` if initialization has been performed, `false` until then.
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*/
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bool mInitialized;
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friend class Probe; // Needs to access |mSessionHandle|
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friend ULONG WINAPI ControlCallback(WMIDPREQUESTCODE aRequestCode,
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PVOID aContext,
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ULONG* aReserved,
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PVOID aBuffer); // Sets |mSessionHandle|
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};
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} // namespace probes
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} // namespace mozilla
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#endif //mozilla_perfprobe_h
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