author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 02 Sep 2010 22:05:40 +0300 | |
changeset 45 | 185201be11b0 |
child 56 | aa2539c91954 |
permissions | -rw-r--r-- |
45
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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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|
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#include <e32def.h> |
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#include <e32def_private.h> |
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#include <e32cmn.h> |
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#include <e32cmn_private.h> |
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#include <kernel/kernel.h> |
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#include <kernel/kern_priv.h> |
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#include <nk_trace.h> |
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#include <arm.h> |
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|
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#include "d_process_tracker.h" |
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#include "debug_logging.h" |
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|
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#include "d_debug_agent.h" |
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#include "debug_utils.h" |
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|
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#include "d_debug_agent.inl" |
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using namespace Debug; |
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// ctor |
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DDebugAgent::DDebugAgent(TUint64 aId) : |
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iId(aId), |
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iRequestGetEventStatus(NULL), |
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iClientThread(0), |
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iEventQueue(KNumberOfEventsToQueue, 0), |
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iHead(0), |
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iTail(0), |
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iEventQueueLock(NULL), |
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iFreeSlots(KNumberOfEventsToQueue), |
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iIgnoringTrace(EFalse), |
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iEventBalance(0) |
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{ |
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LOG_MSG2("DDebugAgent::DDebugAgent(), this=0x%x ", this); |
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|
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// Initialize all the Event Actions to Ignore |
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for(TInt i=0; i<EEventsLast; i++) |
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{ |
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iEventActions[i] = EActionIgnore; |
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} |
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} |
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|
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DDebugAgent* DDebugAgent::New(TUint64 aId) |
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{ |
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LOG_MSG2("DDebugAgent::New(id=0x%lx)", aId); |
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DDebugAgent* agent = new DDebugAgent(aId); |
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if(agent == NULL) |
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{ |
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return (NULL); |
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} |
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if(KErrNone != agent->Construct()) |
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{ |
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delete agent; |
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return (NULL); |
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} |
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|
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// Use a semaphore to serialise access |
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TInt err = Kern::SemaphoreCreate(agent->iEventQueueLock, _L("RM_DebugAgentQueueLock"), 1 /* Initial count */); |
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if (err != KErrNone) |
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return NULL; |
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|
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return agent; |
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} |
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|
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/** Standard contructor. |
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* Fills event queue with empty events |
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* @return : standard system error code |
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*/ |
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TInt DDebugAgent::Construct() |
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{ |
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// Empty the event queue |
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TDriverEventInfo emptyEvent; |
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TInt err = KErrNone; |
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|
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for (TInt i=0; i<KNumberOfEventsToQueue; i++) |
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{ |
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err = iEventQueue.Append(emptyEvent); |
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if (err != KErrNone) |
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{ |
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LOG_MSG("Error appending blank event entry"); |
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return err; |
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} |
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} |
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|
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err = Kern::CreateClientDataRequest(iRequestGetEventStatus); |
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if(err != KErrNone) |
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{ |
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LOG_MSG("Error creating TClientDataRequest"); |
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return err; |
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} |
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108 |
|
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LOG_MSG2("DDebugAgent::Construct() iRequestGetEventStatus=0x%08x", iRequestGetEventStatus); |
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110 |
|
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return err; |
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} |
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113 |
|
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// dtor |
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DDebugAgent::~DDebugAgent() |
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116 |
{ |
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iEventQueue.Reset(); |
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118 |
|
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if (iEventQueueLock) |
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iEventQueueLock->Close(NULL); |
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121 |
|
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if(iRequestGetEventStatus) |
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Kern::DestroyClientRequest(iRequestGetEventStatus); |
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124 |
|
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125 |
} |
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126 |
|
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// Associate an action with a particular kernel event |
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TInt DDebugAgent::SetEventAction(TEventType aEvent, TKernelEventAction aEventAction) |
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129 |
{ |
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// Valid Event? |
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if (aEvent >= EEventsLast) |
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132 |
{ |
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LOG_MSG2("DDebugAgent::EventAction: Bad Event number %d",aEvent); |
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return KErrArgument; |
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135 |
} |
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136 |
|
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iEventActions[aEvent] = aEventAction; |
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138 |
|
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return KErrNone; |
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140 |
} |
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|
141 |
|
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/** Get the aEventAction associated with aEvent |
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143 |
* |
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* @return : aEventAction (always +ve), or KErrArgument. |
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145 |
*/ |
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TInt DDebugAgent::EventAction(TEventType aEvent) |
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147 |
{ |
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// Validate the Event id |
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if (aEvent >= EEventsLast) |
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150 |
{ |
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LOG_MSG2("DDebugAgent::EventAction: Bad Event number %d",aEvent); |
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return KErrArgument; |
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153 |
} |
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|
154 |
|
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// Return the action associated with this event |
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return iEventActions[aEvent]; |
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157 |
} |
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|
158 |
|
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159 |
/** Obtain the details of the latest kernel event (if it exists) and place the details in aEventInfo |
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* If there is no event in the queue for this process+agent combination, store the details |
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* so that it can be notified later when an event actually occurs. |
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162 |
* |
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* @param aAsyncGetValueRequest - TClientDataRequest object used for pinning user memory |
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* @param aClientThread - The ThreadId of the requesting user-side process. In this case the DSS. |
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165 |
*/ |
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166 |
void DDebugAgent::GetEvent(TClientDataRequest<TEventInfo>* aAsyncGetValueRequest, DThread* aClientThread) |
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167 |
{ |
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LockEventQueue(); |
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|
169 |
|
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iRequestGetEventStatus->Reset(); |
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TInt err = iRequestGetEventStatus->SetStatus( aAsyncGetValueRequest->StatusPtr() ); |
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if (err != KErrNone) |
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|
173 |
{ |
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174 |
LOG_MSG2("Error :iRequestGetEventStatus->SetStatus ret %d", err); |
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UnlockEventQueue(); |
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176 |
return; |
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177 |
} |
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|
178 |
|
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iRequestGetEventStatus->SetDestPtr( aAsyncGetValueRequest->DestPtr() ); |
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|
180 |
|
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iEventBalance++; |
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|
182 |
|
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|
183 |
LOG_MSG5("DDebugAgent::GetEvent: this=0x%08x, iRequestGetEventStatus=0x%08x, iEventBalance=%d, destPrt=0x%08x", |
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this, iRequestGetEventStatus, iEventBalance, aAsyncGetValueRequest->DestPtr() ); |
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|
185 |
|
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|
186 |
iClientThread = aClientThread; |
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|
187 |
|
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if (BufferEmpty()) |
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|
189 |
{ |
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|
190 |
LOG_MSG2("Event buffer empty, iEventBalance=%d", iEventBalance); |
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|
191 |
UnlockEventQueue(); |
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192 |
return; |
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|
193 |
} |
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|
194 |
|
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195 |
LOG_MSG5("Event already available at queue pos (tail)=%d, evType=%d, threadId=0x%x, actionTaken=%d", |
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iTail, iEventQueue[iTail].iEventType, |
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|
197 |
iEventQueue[iTail].iThreadId, iEventQueue[iTail].iActionTaken ); |
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|
198 |
|
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199 |
// returning the event to the client |
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|
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err = iEventQueue[iTail].WriteEventToClientThread(iRequestGetEventStatus,iClientThread); |
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|
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if (err != KErrNone) |
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|
202 |
{ |
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|
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LOG_MSG2("Error writing event info: %d", err); |
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UnlockEventQueue(); |
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205 |
return; |
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206 |
} |
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|
207 |
|
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208 |
// signal the DSS thread |
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209 |
Kern::QueueRequestComplete(iClientThread, iRequestGetEventStatus, KErrNone); |
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iEventBalance--; |
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|
211 |
|
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212 |
iEventQueue[iTail].Reset(); |
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|
213 |
|
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// move to the next slot |
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IncrementTailPosition(); |
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216 |
|
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UnlockEventQueue(); |
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} |
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219 |
|
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/** |
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* Stop waiting for an event to occur. This means events will be placed |
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* in the iEventQueue (by setting iEventBalance to 0) until GetEvent is called. |
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*/ |
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TInt DDebugAgent::CancelGetEvent(void) |
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225 |
{ |
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LOG_MSG2("DDebugAgent::CancelGetEvent. iEventBalance=%d. > QueueRequestComplete", iEventBalance); |
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Kern::QueueRequestComplete(iClientThread, iRequestGetEventStatus, KErrCancel); |
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iEventBalance=0; |
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iClientThread = 0; |
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return KErrNone; |
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} |
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232 |
|
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/** Signal a kernel event to the user-side DSS when it occurs, or queue it for later |
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* if the user-side has not called GetEvent (see above). |
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* |
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* @param aEventInfo - the details of the event to queue. |
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*/ |
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void DDebugAgent::NotifyEvent(const TDriverEventInfo& aEventInfo) |
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239 |
{ |
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240 |
|
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if(aEventInfo.iEventType >= EEventsLast) |
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242 |
{ |
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LOG_MSG3("DDebugAgent::NotifyEvent(),iEventType %d, this=0x%x. Ignoring since > EEventsLast", aEventInfo.iEventType, this); |
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return; |
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} |
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246 |
|
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LockEventQueue(); |
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248 |
|
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DThread* currentThread = &Kern::CurrentThread(); |
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250 |
|
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251 |
|
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TKernelEventAction action = iEventActions[aEventInfo.iEventType]; |
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253 |
|
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if (aEventInfo.iProcessId == Id() && |
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(aEventInfo.iEventType == EEventsSwExc || aEventInfo.iEventType == EEventsHwExc || aEventInfo.iEventType == EEventsKillThread)) |
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256 |
{ |
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257 |
|
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// It might be nice not to deliver *any* events about the debug agent to the agent itself, but this is a bit too drastic a change to make. |
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// There's a risk it might completely break TRK or similar, and at a more practical level it would require major rewriting of the t_rmdebug2 |
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// tests. |
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261 |
// |
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// So instead, we only don't suspend&deliver events about the debug agent IF it's a thread crash event AND the thread is process |
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// critical/permanent AND (in the case of a critical thread) it's an abnormal exit. We're not worrying (yet) about the case where the entire |
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// process is set as system critical |
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// This fixes the original problem with CDS's worker thread crashing, and doesn't wreck the t_rmdebug2 tests. |
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266 |
|
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TBool problematic = ( |
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(aEventInfo.iThreadFlags & (KThreadFlagProcessCritical|KThreadFlagSystemCritical) && (aEventInfo.iEventType != EEventsKillThread || aEventInfo.iExitType != EExitKill)) // process or system critical, and either an exception (not a EEventsKillThread) or a non EExitKill exit |
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|| (aEventInfo.iThreadFlags & (KThreadFlagProcessPermanent|KThreadFlagSystemPermanent)) |
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270 |
); |
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271 |
|
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272 |
if (problematic) |
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273 |
{ |
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LOG_MSG("Agent is dying - no further events will be delivered to it"); |
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iAgentDying = ETrue; |
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276 |
} |
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277 |
|
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278 |
} |
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279 |
|
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if (iAgentDying && action == EActionSuspend) |
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281 |
{ |
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LOG_MSG("Not delivering this event or suspending the thread because agent is dying"); |
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action = EActionIgnore; |
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284 |
} |
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|
285 |
|
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286 |
switch (action) |
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287 |
{ |
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288 |
case EActionSuspend: |
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289 |
{ |
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LOG_MSG5("DDebugAgent::NotifyEvent(), Suspend thread, iEventType %d, this=0x%x currThrd=0x%08x, iEventBalance=%d", |
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aEventInfo.iEventType, this, currentThread, iEventBalance ); |
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|
292 |
|
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switch(aEventInfo.iEventType) |
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294 |
{ |
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295 |
case EEventsAddLibrary: |
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296 |
case EEventsRemoveLibrary: |
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297 |
// TomS: Anybody want to explain what is going on here?? |
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currentThread = DebugUtils::OpenThreadHandle(aEventInfo.iThreadId); |
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if(currentThread) |
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300 |
{ |
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currentThread->Close(NULL); |
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302 |
} |
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303 |
break; |
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304 |
default: |
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305 |
break; |
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306 |
} |
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|
307 |
|
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308 |
// Do not call suspend for breakpoints, since the breakpoint code that runs when deciding if an exception |
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309 |
// is a breakpoint will itself suspend the thread |
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if( (aEventInfo.iEventType != EEventsBreakPoint) && (aEventInfo.iEventType != EEventsProcessBreakPoint) ) |
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311 |
{ |
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TInt err = TheDProcessTracker.SuspendThread(currentThread, aEventInfo.FreezeOnSuspend()); |
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if((err != KErrNone) && (err != KErrAlreadyExists)) |
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314 |
{ |
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315 |
// Is there anything we can do in the future to deal with this error having happened? |
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316 |
LOG_MSG2("DDebugAgent::NotifyEvent() Problem while suspending thread: %d", err); |
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317 |
} |
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|
318 |
} |
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|
319 |
|
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|
320 |
// now drop through to the continue case, which typically notifies |
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|
321 |
// the debug agent of the event |
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|
322 |
} |
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|
323 |
case EActionContinue: |
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|
324 |
{ |
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|
325 |
if( action == EActionContinue ) |
185201be11b0
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diff
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|
326 |
{ |
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|
327 |
LOG_MSG5("DDebugAgent::NotifyEvent(), Action continue, iEventType %d, this=0x%x currThrd=0x%08x, iEventBalance=%d", |
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|
328 |
aEventInfo.iEventType, this, currentThread, iEventBalance ); |
185201be11b0
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|
329 |
} |
185201be11b0
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diff
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|
330 |
|
185201be11b0
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|
331 |
// Queue this event |
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|
332 |
TDriverEventInfo eventInfo = aEventInfo; |
185201be11b0
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|
333 |
eventInfo.iActionTaken = action; |
185201be11b0
Revision: 201035
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|
334 |
QueueEvent(eventInfo); |
185201be11b0
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diff
changeset
|
335 |
|
185201be11b0
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|
336 |
// Tell the user about the oldest event in the queue |
185201be11b0
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|
337 |
if ( iClientThread ) |
185201be11b0
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|
338 |
{ |
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|
339 |
if( iRequestGetEventStatus && (iEventBalance > 0) ) |
185201be11b0
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|
340 |
{ |
185201be11b0
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|
341 |
// Fill the event data |
185201be11b0
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|
342 |
TInt err = iEventQueue[iTail].WriteEventToClientThread(iRequestGetEventStatus,iClientThread); |
185201be11b0
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|
343 |
if (err != KErrNone) |
185201be11b0
Revision: 201035
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|
344 |
{ |
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|
345 |
LOG_MSG2("Error writing event info: %d", err); |
185201be11b0
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|
346 |
} |
185201be11b0
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|
347 |
|
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|
348 |
// signal the debugger thread |
185201be11b0
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|
349 |
LOG_MSG4("> QueueRequestComplete iRequestGetEventStatus=0x%08x, iEventBalance=%d, iTail=%d", |
185201be11b0
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|
350 |
iRequestGetEventStatus->iStatus, iEventBalance, iTail ); |
185201be11b0
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diff
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|
351 |
Kern::QueueRequestComplete(iClientThread, iRequestGetEventStatus, KErrNone); |
185201be11b0
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diff
changeset
|
352 |
|
185201be11b0
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|
353 |
iEventBalance--; |
185201be11b0
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changeset
|
354 |
|
185201be11b0
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|
355 |
iEventQueue[iTail].Reset(); |
185201be11b0
Revision: 201035
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diff
changeset
|
356 |
|
185201be11b0
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|
357 |
// move to the next slot |
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|
358 |
IncrementTailPosition(); |
185201be11b0
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diff
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|
359 |
} |
185201be11b0
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|
360 |
else |
185201be11b0
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diff
changeset
|
361 |
{ |
185201be11b0
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|
362 |
if( !iRequestGetEventStatus ) |
185201be11b0
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diff
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|
363 |
{ |
185201be11b0
Revision: 201035
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diff
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|
364 |
LOG_MSG("iRequestGetEventStatus is NULL so not signalling client" ); |
185201be11b0
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diff
changeset
|
365 |
} |
185201be11b0
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diff
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|
366 |
else |
185201be11b0
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diff
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|
367 |
{ |
185201be11b0
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|
368 |
LOG_MSG2("Queued event. iEventBalance=%d (unbalanced event requests vs notifications)", |
185201be11b0
Revision: 201035
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|
369 |
iEventBalance ); |
185201be11b0
Revision: 201035
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diff
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|
370 |
} |
185201be11b0
Revision: 201035
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diff
changeset
|
371 |
} |
185201be11b0
Revision: 201035
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diff
changeset
|
372 |
} |
185201be11b0
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diff
changeset
|
373 |
else |
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diff
changeset
|
374 |
{ |
185201be11b0
Revision: 201035
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parents:
diff
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|
375 |
LOG_MSG("DDebugAgent::NotifyEvent() : Not informing client since its thread is NULL"); |
185201be11b0
Revision: 201035
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diff
changeset
|
376 |
} |
185201be11b0
Revision: 201035
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|
377 |
break; |
185201be11b0
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diff
changeset
|
378 |
} |
185201be11b0
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|
379 |
case EActionIgnore: |
185201be11b0
Revision: 201035
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diff
changeset
|
380 |
default: |
185201be11b0
Revision: 201035
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diff
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|
381 |
// Ignore everything we don't understand. |
185201be11b0
Revision: 201035
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diff
changeset
|
382 |
break; |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
383 |
} |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
384 |
|
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
385 |
UnlockEventQueue(); |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
386 |
|
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
387 |
} |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
388 |
|
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
389 |
// Used to identify which Debug Agent this DDebugAgent is associated with. |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
390 |
TUint64 DDebugAgent::Id(void) |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
391 |
{ |
185201be11b0
Revision: 201035
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diff
changeset
|
392 |
return iId; |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
393 |
} |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
394 |
|
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
395 |
/** |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
396 |
* Used to add an event to the event queue for this debug agent if event |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
397 |
* queue is not at critical level. If it is at critical and it is trace event, |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
398 |
* we start ignoring trace events and insert a lost trace event. |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
399 |
* If the buffer cannot store an event, only insert a buffer full event. |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
400 |
* @see EEventsBufferFull |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
401 |
* @see EEventsUserTracesLost |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
402 |
* @see TDriverEventInfo |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
403 |
* @see iEventQueue |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
404 |
*/ |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
405 |
void DDebugAgent::QueueEvent(const TDriverEventInfo& aEventInfo) |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
406 |
{ |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
407 |
// Have we caught the tail? |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
408 |
if(BufferFull()) |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
409 |
{ |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
410 |
LOG_MSG("DDebugAgent::QueueEvent : BufferFull. Not queueing"); |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
411 |
return; |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
412 |
} |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
413 |
|
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
414 |
// Assert if we think there is space but the slot is not marked empty |
185201be11b0
Revision: 201035
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
415 |
__NK_ASSERT_DEBUG(iEventQueue[iHead].iEventType == EEventsUnknown); |
185201be11b0
Revision: 201035
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
416 |
|
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
417 |
const TBool bufferAtCritical = BufferAtCriticalLevel(); |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
418 |
|
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
419 |
if(!bufferAtCritical) |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
420 |
{ |
185201be11b0
Revision: 201035
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
421 |
//reset the iIgnoringTrace flag as we are not at |
185201be11b0
Revision: 201035
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parents:
diff
changeset
|
422 |
//critical level and can store event |
185201be11b0
Revision: 201035
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
423 |
iIgnoringTrace = EFalse; |
185201be11b0
Revision: 201035
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
424 |
|
185201be11b0
Revision: 201035
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
425 |
// Insert the event into the ring buffer at iHead |
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iEventQueue[iHead] = aEventInfo; |
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IncrementHeadPosition(); |
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} |
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else if(bufferAtCritical && BufferCanStoreEvent()) |
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{ |
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LOG_MSG("DDebugAgent::QueueEvent : BufferCritical"); |
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if(aEventInfo.iEventType == EEventsUserTrace) |
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{ |
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if(!iIgnoringTrace) |
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{ |
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//if this is the first time we are ignoring trace events, |
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//we need to issue a EEventsUserTracesLost event |
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iEventQueue[iHead].Reset(); |
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iEventQueue[iHead].iEventType = EEventsUserTracesLost; |
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IncrementHeadPosition(); |
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|
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iIgnoringTrace = ETrue; |
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} |
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else |
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{ |
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//otherwise, ignore this event |
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LOG_MSG("DDebugAgent::QueueEvent : Ignore EEventsUserTrace event"); |
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} |
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} |
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else |
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{ |
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// Store the event since its not a trace event |
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iEventQueue[iHead] = aEventInfo; |
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IncrementHeadPosition(); |
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} |
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} |
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else |
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{ |
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//At critical level and cannot store new events, so |
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//only one space left. Store a EEventsBufferFull event |
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LOG_MSG("DDebugAgent::QueueEvent : Event Buffer Full, ignoring event"); |
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iEventQueue[iHead].Reset(); |
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iEventQueue[iHead].iEventType = EEventsBufferFull; |
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IncrementHeadPosition(); |
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} |
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} |
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|
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// End of file - d_debug_agent.cpp |