author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 31 Aug 2010 16:45:49 +0300 | |
branch | RCL_3 |
changeset 43 | ca8a1b6995f6 |
child 56 | aa2539c91954 |
permissions | -rw-r--r-- |
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// Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of the License "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// Purpose: Kernel-side tracking of debug agent information associated |
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// with each process being debugged. |
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// |
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// |
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#ifndef D_DEBUG_AGENT_H |
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#define D_DEBUG_AGENT_H |
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#include <rm_debug_api.h> |
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#include "d_driver_event_info.h" |
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/** |
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* Handles events from the kernel, filters them according to the debug agent's requests, |
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* and signals these events to the user side in FIFO-style. |
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* @see TKernelEventAction |
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* @see TEventInfo |
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*/ |
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class DDebugAgent : public DBase |
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{ |
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public: |
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static DDebugAgent* New(TUint64 aId); |
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~DDebugAgent(); |
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TInt SetEventAction(Debug::TEventType aEvent, Debug::TKernelEventAction aEventAction); |
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void GetEvent(TClientDataRequest<Debug::TEventInfo>* aAsyncGetValueRequest, DThread* aClientThread); |
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TInt EventAction(Debug::TEventType aEvent); |
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TInt CancelGetEvent(void); |
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void NotifyEvent(const TDriverEventInfo& aEventInfo); |
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TUint64 Id(); |
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protected: |
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DDebugAgent(TUint64 aId); |
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TInt Construct(); |
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private: |
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void QueueEvent(const TDriverEventInfo& aEventInfo); |
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TBool BufferEmpty() const; |
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TBool BufferFull() const; |
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TBool BufferCanStoreEvent() const; |
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TBool BufferAtCriticalLevel() const; |
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void IncrementHeadPosition(void); |
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void IncrementTailPosition(void); |
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TInt NumberOfEmptySlots() const; |
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void LockEventQueue(void); |
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void UnlockEventQueue(void); |
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private: |
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TUint64 iId; |
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Debug::TKernelEventAction iEventActions[Debug::EEventsLast]; |
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/** |
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* Object used to write events back to DSS thread |
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* @see TEventInfo |
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*/ |
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TClientDataRequest<Debug::TEventInfo>* iRequestGetEventStatus; |
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DThread* iClientThread; |
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/** |
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* Ring buffer of pending events. Access to it is controlled by |
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* @see iEventQueueLock |
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*/ |
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RArray<TDriverEventInfo> iEventQueue; |
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/** |
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* Ring buffer head. Points to the next empty slot in iEventQueue |
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* @see iEventQueue |
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*/ |
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TInt iHead; |
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/** |
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* Ring buffer tail. Points to the oldest full slot in iEventQueue |
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* @see iEventQueue |
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*/ |
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TInt iTail; |
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/** |
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* Control access to event queue. |
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* @see iEventQueue |
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*/ |
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DSemaphore* iEventQueueLock; |
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/** |
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* Keeps track of how many free slots are available in the event queue. |
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* @see iEventQueue |
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*/ |
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TInt iFreeSlots; |
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/** |
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* Boolean to indicate if we have told the agent that we are ignoring trace events |
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* @see QueueEvent |
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*/ |
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TBool iIgnoringTrace; |
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/** |
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* Used to control the delivery of events to the client so that only |
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* when more requests than deliveries have taken place can we deliver the |
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* next event |
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* |
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* Incremented when a request for event takes place |
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* @see GetEvent |
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* |
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* Decremented when an event is delivered. |
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* @see NotifyEvent |
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* |
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* Cleared when event requests are cancelled |
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* @see CancelGetEvent |
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* |
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*/ |
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TInt iEventBalance; |
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/** |
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* Length of kernel-event queue. |
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* This is a power of two for efficiency when using the |
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* remainder operator |
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* @see DDebugAgent::iEventQueue |
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*/ |
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static const TUint KNumberOfEventsToQueue = 128; |
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/** |
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* This determines the number of events at which we stop accepting |
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* low priority events into the event queue. |
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* @see DDebugAgent::BufferAtCriticalLevel |
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* @see DDebugAgent::iEventQueue |
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*/ |
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static const TUint KCriticalBufferSize = 64; |
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/** |
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* If we encounter an event that will take down the agent (eg a process critical thread crashing) |
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* we use this flag to stop trying to deliver thread death notifications to it. |
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*/ |
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TBool iAgentDying; |
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}; |
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#endif // D_DEBUG_AGENT_H |
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