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// Copyright (c) 2002-2010 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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// e32\drivers\usbcc\queue.cpp
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// Platform independent layer (PIL) of the USB Device controller driver:
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// Simple singly linked list + its iterator.
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//
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//
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/**
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@file queue.cpp
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@internalTechnology
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*/
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#include <drivers/usbc.h>
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#include "OstTraceDefinitions.h"
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#ifdef OST_TRACE_COMPILER_IN_USE
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#include "queueTraces.h"
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#endif
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void TSglQueLink::Enque(TSglQueLink* aLink)
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//
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// Enque this after aLink.
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//
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{
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iNext = aLink->iNext;
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aLink->iNext = this;
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}
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TSglQueBase::TSglQueBase(TInt aOffset)
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//
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// Constructor
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//
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: iHead(NULL), iLast((TSglQueLink*) &iHead), iOffset(aOffset), iElements(0)
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{
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// ESQueOffsetNotAligned
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__ASSERT_ALWAYS((iOffset % 4 == 0), Kern::Fault(KUsbPILPanicCat, __LINE__));
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}
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void TSglQueBase::DoAddLast(TAny* aPtr)
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//
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// Add the object at the end of the queue.
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//
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{
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TSglQueLink* pL = PtrAdd((TSglQueLink*) aPtr, iOffset);
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pL->Enque(iLast);
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iLast = pL;
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iElements++;
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__ASSERT_DEBUG((iElements > 0), Kern::Fault(KUsbPILPanicCat, __LINE__));
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}
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void TSglQueBase::DoRemove(TAny* aPtr)
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//
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// Remove the object from the queue.
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//
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{
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TSglQueLink* pP = (TSglQueLink*) (&iHead);
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TSglQueLink* pL = PtrAdd((TSglQueLink*) aPtr, iOffset);
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TSglQueLink* pN = pP->iNext;
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while (pN)
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{
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if (pN == pL)
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{
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pP->iNext = pN->iNext;
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if (iLast == pL)
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{
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iLast = pP;
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if (iLast == NULL)
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iLast = (TSglQueLink*) (&iHead);
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}
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iElements--;
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__ASSERT_DEBUG((iElements >= 0), Kern::Fault(KUsbPILPanicCat, __LINE__));
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return;
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}
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pP = pN;
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pN = pP->iNext;
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}
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// This doesn't have to indicate an error (but might):
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OstTraceDef0( OST_TRACE_CATEGORY_RND, TRACE_FATAL, TSGLQUEBASE_DOREMOVE,
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"TSglQueBase::DoRemove: ESQueLinkNotQueued" );
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}
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TSglQueIterBase::TSglQueIterBase(TSglQueBase& aQue)
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//
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// Constructor.
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//
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: iOffset(aQue.iOffset), iHead(aQue.iHead), iNext(aQue.iHead)
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{
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}
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void TSglQueIterBase::SetToFirst()
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//
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// Start from the beginning of the que.
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//
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{
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iNext = iHead->iNext;
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}
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TAny* TSglQueIterBase::DoPostInc()
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//
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// Return the current pointer and increment.
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//
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{
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TAny* pN = iNext;
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if (pN == NULL)
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return NULL;
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iNext = iNext->iNext;
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return PtrSub(pN, iOffset);
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}
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//---
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