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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@2 be3aeb3a-fb24-0410-a615-afba39da0efa
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269
platform/uiq3/engine/polledas.cpp
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269
platform/uiq3/engine/polledas.cpp
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/*******************************************************************
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*
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* File: PolledAS.cpp
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*
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* Author: Peter van Sebille (peter@yipton.net)
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*
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* (c) Copyright 2002, Peter van Sebille
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* All Rights Reserved
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*
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*******************************************************************/
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/*
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* Oh Lord, forgive me for I have sinned.
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* In their infinite wisdom, Symbian Engineers have decided that
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* the Active Scheduler's queue of Active Objects is private
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* and no getters are provided... sigh.
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* This mere mortal will have to excercise the power of C pre-processor
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* once more to circumvent the will of the gods.
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*/
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#include <e32std.h>
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// from e32base.h
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class CBase
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{
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public:
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/**
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Default constructor
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*/
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inline CBase() {}
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IMPORT_C virtual ~CBase();
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inline TAny* operator new(TUint aSize, TAny* aBase) __NO_THROW { Mem::FillZ(aBase, aSize); return aBase; }
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inline TAny* operator new(TUint aSize) __NO_THROW { return User::AllocZ(aSize); }
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inline TAny* operator new(TUint aSize, TLeave) { return User::AllocZL(aSize); }
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inline TAny* operator new(TUint aSize, TUint aExtraSize) { return User::AllocZ(aSize + aExtraSize); }
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inline TAny* operator new(TUint aSize, TLeave, TUint aExtraSize) { return User::AllocZL(aSize + aExtraSize); }
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IMPORT_C static void Delete(CBase* aPtr);
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protected:
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IMPORT_C virtual TInt Extension_(TUint aExtensionId, TAny*& a0, TAny* a1);
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private:
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CBase(const CBase&);
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CBase& operator=(const CBase&);
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private:
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};
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class TRequestStatusFaked
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{
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public:
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inline TRequestStatusFaked() : iFlags(0) {};
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inline TRequestStatusFaked(TInt aVal) : iStatus(aVal), iFlags(aVal==KRequestPending ? TRequestStatusFaked::ERequestPending : 0) {}
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/* inline TInt operator=(TInt aVal);
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inline TBool operator==(TInt aVal) const;
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*/
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inline TBool operator!=(TInt aVal) const {return(iStatus!=aVal);}
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/*
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inline TBool operator>=(TInt aVal) const;
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inline TBool operator<=(TInt aVal) const;
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inline TBool operator>(TInt aVal) const;
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inline TBool operator<(TInt aVal) const;
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inline TInt Int() const;
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private:
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*/
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enum
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{
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EActive = 1, //bit0
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ERequestPending = 2, //bit1
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};
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TInt iStatus;
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TUint iFlags;
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friend class CActive;
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friend class CActiveScheduler;
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friend class CServer2;
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};
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class CActive : public CBase
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{
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public:
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enum TPriority
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{
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EPriorityIdle=-100,
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EPriorityLow=-20,
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EPriorityStandard=0,
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EPriorityUserInput=10,
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EPriorityHigh=20,
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};
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public:
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IMPORT_C ~CActive();
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IMPORT_C void Cancel();
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IMPORT_C void Deque();
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IMPORT_C void SetPriority(TInt aPriority);
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inline TBool IsActive() const {return(iStatus.iFlags&TRequestStatus::EActive);}
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inline TBool IsAdded() const {return(iLink.iNext!=NULL);}
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inline TInt Priority() const {return iLink.iPriority;}
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protected:
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IMPORT_C CActive(TInt aPriority);
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IMPORT_C void SetActive();
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virtual void DoCancel() =0;
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virtual void RunL() =0;
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IMPORT_C virtual TInt RunError(TInt aError);
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protected:
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IMPORT_C virtual TInt Extension_(TUint aExtensionId, TAny*& a0, TAny* a1);
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public:
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TRequestStatusFaked iStatus; // hope this will work
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private:
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// TBool iActive;
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TPriQueLink iLink;
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TAny* iSpare;
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friend class CActiveScheduler;
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friend class CServer;
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friend class CServer2;
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friend class CPrivatePolledActiveScheduler; // added
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};
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class CActiveScheduler : public CBase
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{
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friend class CActiveSchedulerWait;
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public:
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struct TLoop;
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typedef TLoop* TLoopOwner;
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public:
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IMPORT_C CActiveScheduler();
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IMPORT_C ~CActiveScheduler();
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IMPORT_C static void Install(CActiveScheduler* aScheduler);
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IMPORT_C static CActiveScheduler* Current();
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IMPORT_C static void Add(CActive* aActive);
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IMPORT_C static void Start();
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IMPORT_C static void Stop();
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IMPORT_C static TBool RunIfReady(TInt& aError, TInt aMinimumPriority);
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IMPORT_C static CActiveScheduler* Replace(CActiveScheduler* aNewActiveScheduler);
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IMPORT_C virtual void WaitForAnyRequest();
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IMPORT_C virtual void Error(TInt aError) const;
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IMPORT_C void Halt(TInt aExitCode) const;
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IMPORT_C TInt StackDepth() const;
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private:
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static void Start(TLoopOwner* aOwner);
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IMPORT_C virtual void OnStarting();
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IMPORT_C virtual void OnStopping();
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IMPORT_C virtual void Reserved_1();
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IMPORT_C virtual void Reserved_2();
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void Run(TLoopOwner* const volatile& aLoop);
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void DoRunL(TLoopOwner* const volatile& aLoop, CActive* volatile & aCurrentObj);
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friend class CPrivatePolledActiveScheduler; // added
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protected:
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IMPORT_C virtual TInt Extension_(TUint aExtensionId, TAny*& a0, TAny* a1);
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protected:
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inline TInt Level() const {return StackDepth();} // deprecated
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private:
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TLoop* iStack;
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TPriQue<CActive> iActiveQ;
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TAny* iSpare;
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};
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class TCleanupItem;
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class CleanupStack
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{
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public:
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IMPORT_C static void PushL(TAny* aPtr);
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IMPORT_C static void PushL(CBase* aPtr);
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IMPORT_C static void PushL(TCleanupItem anItem);
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IMPORT_C static void Pop();
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IMPORT_C static void Pop(TInt aCount);
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IMPORT_C static void PopAndDestroy();
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IMPORT_C static void PopAndDestroy(TInt aCount);
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IMPORT_C static void Check(TAny* aExpectedItem);
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inline static void Pop(TAny* aExpectedItem);
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inline static void Pop(TInt aCount, TAny* aLastExpectedItem);
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inline static void PopAndDestroy(TAny* aExpectedItem);
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inline static void PopAndDestroy(TInt aCount, TAny* aLastExpectedItem);
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};
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/*
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* This will declare CPrivatePolledActiveScheduler as a friend
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* of all classes that define a friend. CPrivatePolledActiveScheduler needs to
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* be a friend of CActive
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*/
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//#define friend friend class CPrivatePolledActiveScheduler; friend
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/*
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* This will change the:
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* void DoStart();
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* method in CActiveScheduler to:
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* void DoStart(); friend class CPrivatePolledActiveScheduler;
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* We need this to access the private datamembers in CActiveScheduler.
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*/
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//#define DoStart() DoStart(); friend class CPrivatePolledActiveScheduler;
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//#include <e32base.h>
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#include "PolledAS.h"
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class CPrivatePolledActiveScheduler : public CActiveScheduler
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{
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public:
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void Schedule();
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};
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void CPrivatePolledActiveScheduler::Schedule()
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{
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TDblQueIter<CActive> q(iActiveQ);
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q.SetToFirst();
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FOREVER
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{
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CActive *pR=q++;
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if (pR)
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{
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//TRequestStatus::EActive = 1, //bit0
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//TRequestStatus::ERequestPending = 2, //bit1
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if (pR->IsActive() && pR->iStatus!=KRequestPending)
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{
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// pR->iActive=EFalse; // won't this cause trouble?
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pR->iStatus.iFlags&=~TRequestStatusFaked::EActive;
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//debugPrintFile(_L("as: %08x"), pR);
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TRAPD(r,pR->RunL());
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//pR->iStatus=TRequestStatus::ERequestPending;
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break;
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}
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}
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else
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break;
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}
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}
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static CPolledActiveScheduler* sPolledActiveScheduler = NULL;
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CPolledActiveScheduler::~CPolledActiveScheduler()
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{
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sPolledActiveScheduler = NULL;
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delete iPrivatePolledActiveScheduler;
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}
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CPolledActiveScheduler* CPolledActiveScheduler::NewL()
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{
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// if (sPolledActiveScheduler == NULL)
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{
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sPolledActiveScheduler = new(ELeave)CPolledActiveScheduler;
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CleanupStack::PushL(sPolledActiveScheduler);
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sPolledActiveScheduler->ConstructL();
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CleanupStack::Pop();
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}
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return sPolledActiveScheduler;
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}
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void CPolledActiveScheduler::ConstructL()
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{
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iPrivatePolledActiveScheduler = new(ELeave) CPrivatePolledActiveScheduler;
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iPrivatePolledActiveScheduler->Install(iPrivatePolledActiveScheduler);
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}
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void CPolledActiveScheduler::Schedule()
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{
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iPrivatePolledActiveScheduler->Schedule();
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}
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CPolledActiveScheduler* CPolledActiveScheduler::Instance()
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{
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// return (CPolledActiveScheduler*) CActiveScheduler::Current();
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return sPolledActiveScheduler;
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}
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