// Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of the License "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// e32\include\nkern\nk_priv.h

// 

// WARNING: This file contains some APIs which are internal and are subject

//          to change without notice. Such APIs should therefore not be used

//          outside the Kernel and Hardware Services package.

//

#ifndef __NK_PRIV_H__

#define __NK_PRIV_H__

#include <cpudefs.h>

#include <nkern.h>

/********************************************

 * DFCs

 ********************************************/

/**

@internalComponent

*/

inline TBool TDfc::TestAndSetQueued()

	{ return __e32_atomic_swp_ord8(&iSpare3, 1); }

/********************************************

 * Thread

 ********************************************/

class TUserModeCallback;

/**

@publishedPartner

@released

Base class for a nanokernel thread.

*/

class NThreadBase : public TPriListLink

	{

public:

    /**

    Defines the possible states of a nanokernel thread.

    */

	enum NThreadState

		{

		/**

		The thread is eligible for execution.

		Threads in this state are linked into the ready list.

		The highest priority READY thread is the one that will run, unless it

		is blocked on a fast mutex.

		*/

		EReady,

		/**

		The thread is explicitly suspended (rather than blocking on

		a wait object).

		*/

		ESuspended,

		/**

		The thread is blocked waiting for a fast semaphore to be signalled.

		*/

		EWaitFastSemaphore,

		/**

		The thread is blocked waiting for a specific time period to elapse.

		*/

		ESleep,

		/**

		The thread is blocked on a wait object implemented in a layer above

		the nanokernel.

		In practice, this means that it is blocked on a Symbian OS

		semaphore or mutex.

		*/

		EBlocked,

		/**

		The thread has terminated and will not execute again.

		*/

		EDead,

		/**

		The thread is a DFC-handling thread and it is blocked waiting for

		the DFC to be queued.

		*/

		EWaitDfc,

		/**

		Not a thread state, but defines the maximum number of states.

		*/

		ENumNStates

		};

    /**

    Defines a set of values that, when passed to a nanokernel state handler,

    indicates which operation is being performed on the thread.

    Every thread that can use a new type of wait object, must have a nanokernel

    state handler installed to handle operations on that thread while it is

    waiting on that wait object.

    A wait handler has the signature:

    @code

    void StateHandler(NThread* aThread, TInt aOp, TInt aParam);

    @endcode

    where aOp is one of these enum values.

    The state handler is always called with preemption disabled.

    */

	enum NThreadOperation

		{

		/**

		Indicates that the thread is suspended while not in a critical section,

		and not holding a fast mutex.

		StateHandler() is called in whichever context

		NThreadBase::Suspend() is called from.

		Note that the third parameter passed to StateHandler() contains

		the requested suspension count.

		*/

		ESuspend=0,

		/**

		Indicates that the thread is being resumed while suspended, and

		the last suspension has been removed.

		StateHandler() is called in whichever context

		NThreadBase::Resume() is called from.

		*/

		EResume=1,

		/**

		Indicates that the thread has all suspensions cancelled while

		actually suspended.

		Statehandler() is called in whichever context

		NThreadBase::ForceResume() is called from.

		*/

		EForceResume=2,

		/**

		Indicates that the thread is being released from its wait.

		Statehandler() is called in whichever context

		NThreadBase::Release() is called from.

		*/

		ERelease=3,

		/**

		Indicates that the thread's priority is being changed.

		StateHandler() is called in whichever context

		NThreadBase::SetPriority() is called from.

		*/

		EChangePriority=4,

		/**

		Indicates that the thread has called NKern::ThreadLeaveCS() with

		an unknown NThreadBase::iCsFunction that is negative, but not equal

		to NThreadBase::ECsExitPending.

		Note that NThreadBase::iCsFunction is internal to Symbian OS.

		*/

		ELeaveCS=5,

		/**

		Indicates that the thread's wait timeout has expired, and no timeout

		handler has been defined for that thread.

	    StateHandler() is called in the context of the nanokernel

	    timer thread, DfcThread1.

	    */

		ETimeout=6,

		};

	enum NThreadCSFunction

		{

		ECSExitPending=-1,

		ECSExitInProgress=-2

		};

	enum NThreadTimeoutOp

		{

		ETimeoutPreamble=0,

		ETimeoutPostamble=1,

		ETimeoutSpurious=2,

		};

public:

	NThreadBase();

	TInt Create(SNThreadCreateInfo& anInfo,	TBool aInitial);

	IMPORT_C void CheckSuspendThenReady();

	IMPORT_C void Ready();

	void DoReady();

	void DoCsFunction();

	IMPORT_C TBool Suspend(TInt aCount);

	IMPORT_C TBool Resume();

	IMPORT_C TBool ForceResume();

	IMPORT_C void Release(TInt aReturnCode);

	IMPORT_C void RequestSignal();

	IMPORT_C void SetPriority(TInt aPriority);

	void SetEntry(NThreadFunction aFunction);

	IMPORT_C void Kill();

	void Exit();

	void ForceExit();

	// hooks for platform-specific code

	void OnKill(); 

	void OnExit();

public:

	static void TimerExpired(TAny* aPtr);

	inline void UnknownState(TInt aOp, TInt aParam)

		{ (*iHandlers->iStateHandler)((NThread*)this,aOp,aParam); }

	/** @internalComponent */

	inline TUint8 Attributes()

		{ return iSpare2; }

	/** @internalComponent */

	inline TUint8 SetAttributes(TUint8 aNewAtt)

		{ return __e32_atomic_swp_ord8(&iSpare2, aNewAtt); }

	/** @internalComponent */

	inline TUint8 ModifyAttributes(TUint8 aClearMask, TUint8 aSetMask)

		{ return __e32_atomic_axo_ord8(&iSpare2, (TUint8)~(aClearMask|aSetMask), aSetMask); }

	/** @internalComponent */

	inline void SetAddressSpace(TAny* a)

		{ iAddressSpace=a; }

	inline void SetReturnValue(TInt aValue)

		{ iReturnValue=aValue; }

	inline void SetExtraContext(TAny* a, TInt aSize)

		{ iExtraContext = a; iExtraContextSize = aSize; }

	/** @internalComponent */

	void CallUserModeCallbacks();

public:

//	TUint8 iNState;														// use iSpare1 for state

//	TUint8 i_ThrdAttr;						/**< @internalComponent */	// use iSpare2 for attributes

//	TUint8 iUserContextType;											// use iSpare3

	NFastMutex* iHeldFastMutex;				/**< @internalComponent */	// fast mutex held by this thread

	NFastMutex* iWaitFastMutex;				/**< @internalComponent */	// fast mutex on which this thread is blocked

	TAny* iAddressSpace;					/**< @internalComponent */

	TInt iTime;															// time remaining

	TInt iTimeslice;													// timeslice for this thread

	NFastSemaphore iRequestSemaphore;		/**< @internalComponent */

	TAny* iWaitObj;														// object on which this thread is waiting

	TInt iSuspendCount;						/**< @internalComponent */	// -how many times we have been suspended

	TInt iCsCount;							/**< @internalComponent */	// critical section count

	TInt iCsFunction;						/**< @internalComponent */	// what to do on leaving CS: +n=suspend n times, 0=nothing, -1=exit

	NTimer iTimer;							/**< @internalComponent */

	TInt iReturnValue;

	TLinAddr iStackBase;					/**< @internalComponent */

	TInt iStackSize;						/**< @internalComponent */

	const SNThreadHandlers* iHandlers;		/**< @internalComponent */	// additional thread event handlers

	const SFastExecTable* iFastExecTable;	/**< @internalComponent */

	const SSlowExecEntry* iSlowExecTable;	/**< @internalComponent */	// points to first entry iEntries[0]

	TLinAddr iSavedSP;						/**< @internalComponent */

	TAny* iExtraContext;					/**< @internalComponent */	// parent FPSCR value (iExtraContextSize == -1), coprocessor context (iExtraContextSize > 0) or NULL

	TInt iExtraContextSize;					/**< @internalComponent */	// +ve=dynamically allocated, 0=none, -1=iExtraContext stores parent FPSCR value

	TUint iLastStartTime;					/**< @internalComponent */	// last start of execution timestamp

	TUint64 iTotalCpuTime;					/**< @internalComponent */	// total time spent running, in hi-res timer ticks

	TUint32 iTag;							/**< @internalComponent */	// User defined set of bits which is ANDed with a mask when the thread is scheduled, and indicates if a DFC should be scheduled.

	TAny* iVemsData;						/**< @internalComponent */	// This pointer can be used by any VEMS to store any data associated with the thread.  This data must be clean up before the Thread Exit Monitor completes.

	TUserModeCallback* volatile iUserModeCallbacks;	/**< @internalComponent */	// Head of singly-linked list of callbacks

	TUint32 iSpare7;						/**< @internalComponent */	// spare to allow growth while preserving BC

	TUint32 iSpare8;						/**< @internalComponent */	// spare to allow growth while preserving BC

	};

__ASSERT_COMPILE(!(_FOFF(NThreadBase,iTotalCpuTime)&7));

#ifdef __INCLUDE_NTHREADBASE_DEFINES__

#define iNState				iSpare1

#define	i_ThrdAttr			iSpare2

#define iUserContextType	iSpare3

#endif

#define	i_NThread_BasePri	iPriority

/********************************************

 * Scheduler

 ********************************************/

/**

@internalComponent

*/

class TScheduler : public TPriListBase

	{

public:

	TScheduler();

	void Remove(NThreadBase* aThread);

	void RotateReadyList(TInt aPriority);

	void QueueDfcs();

	static void Reschedule();

	static void YieldTo(NThreadBase* aThread);

	void TimesliceTick();

	IMPORT_C static TScheduler* Ptr();

	inline void SetProcessHandler(TLinAddr aHandler) {iProcessHandler=aHandler;}

private:

	SDblQueLink* iExtraQueues[KNumPriorities-1];

public:

	TUint8 iRescheduleNeededFlag;

	TUint8 iDfcPendingFlag;

	TInt iKernCSLocked;

	SDblQue iDfcs;

	TLinAddr iMonitorExceptionHandler;

	TLinAddr iProcessHandler;

	TLinAddr iRescheduleHook;

	TUint8 iInIDFC;

	NFastMutex iLock;

	NThreadBase* iCurrentThread;

	TAny* iAddressSpace;

	TAny* iExtras[16];

	// For EMI support

	NThread* iSigma;	

	TDfc* iEmiDfc;

	TUint32 iEmiMask;

	TUint32 iEmiState;

	TUint32 iEmiDfcTrigger;

	TBool iLogging;

	TAny* iBufferStart;

	TAny* iBufferEnd;

	TAny* iBufferTail;

	TAny* iBufferHead;

	// For BTrace suport

	TUint8 iCpuUsageFilter;

	TUint8 iFastMutexFilter;

	BTrace::THandler iBTraceHandler;

	// Idle notification

	SDblQue iIdleDfcs;

	TUint32 iIdleGenerationCount;

	// Delayed threads

	SDblQue iDelayedQ;

	TDfc iDelayDfc;

	// KernCoreStats

	TUint iMadeReadyCounter;	// Number of times threads' where made ready.

	TUint iMadeUnReadyCounter;	// Number of times threads' where made unready.

	TUint iTimeSliceExpireCounter;	// Number of times threads' time slice expire, resulting in round robin.

	};

GLREF_D TScheduler TheScheduler;

/**

@internalComponent

*/

inline void RescheduleNeeded()

	{TheScheduler.iRescheduleNeededFlag=TRUE;}

#include <nk_plat.h>

/**

@internalComponent

*/

inline NThread* NCurrentThread()

	{ return (NThread*)TheScheduler.iCurrentThread; }

/**

@internalComponent

*/

#define __NK_ASSERT_UNLOCKED	__NK_ASSERT_DEBUG(TheScheduler.iKernCSLocked==0)

/**

@internalComponent

*/

#define __NK_ASSERT_LOCKED		__NK_ASSERT_DEBUG(TheScheduler.iKernCSLocked!=0)

#ifdef _DEBUG

/**

@publishedPartner

@released

*/

#define __ASSERT_NO_FAST_MUTEX	{	\

								NThread* nt=NKern::CurrentThread();	\

								__NK_ASSERT_DEBUG(!nt->iHeldFastMutex); \

								}

/**

@publishedPartner

@released

*/

#define __ASSERT_FAST_MUTEX(m)	{	\

								NThread* nt=NKern::CurrentThread();	\

								__NK_ASSERT_DEBUG(nt->iHeldFastMutex==(m) && (m)->iHoldingThread==nt); \

								}

/**

@publishedPartner

@released

*/

#define __ASSERT_SYSTEM_LOCK	{	\

								NThread* nt=NKern::CurrentThread();	\

								NFastMutex& m=TScheduler::Ptr()->iLock; \

								__NK_ASSERT_DEBUG(nt->iHeldFastMutex==&m && m.iHoldingThread==nt); \

								}

#define __ASSERT_NOT_ISR		__NK_ASSERT_DEBUG(NKern::CurrentContext()!=NKern::EInterrupt)

#else

#define __ASSERT_NO_FAST_MUTEX

#define __ASSERT_FAST_MUTEX(m)

#define	__ASSERT_SYSTEM_LOCK

#define __ASSERT_NOT_ISR

#endif

/********************************************

 * System timer queue

 ********************************************/

/**

@publishedPartner

@released

*/

class NTimerQ

	{

	friend class NTimer;

public:

	typedef void (*TDebugFn)(TAny* aPtr, TInt aPos);	/**< @internalComponent */

	enum { ETimerQMask=31, ENumTimerQueues=32 };		/**< @internalComponent */	// these are not easily modifiable

	/** @internalComponent */

	struct STimerQ

		{

		SDblQue iIntQ;

		SDblQue iDfcQ;

		};

public:

	NTimerQ();

	static void Init1(TInt aTickPeriod);

	static void Init3(TDfcQue* aDfcQ);

	IMPORT_C static TAny* TimerAddress();

	IMPORT_C void Tick();

	IMPORT_C static TInt IdleTime();

	IMPORT_C static void Advance(TInt aTicks);

private:

	static void DfcFn(TAny* aPtr);

	void Dfc();

	void Add(NTimer* aTimer);

	void AddFinal(NTimer* aTimer);

public:

	STimerQ iTickQ[ENumTimerQueues];	/**< @internalComponent */	// NOTE: the order of member data is important

	TUint32 iPresent;					/**< @internalComponent */	// The assembler code relies on it

	TUint32 iMsCount;					/**< @internalComponent */

	SDblQue iHoldingQ;					/**< @internalComponent */

	SDblQue iOrderedQ;					/**< @internalComponent */

	SDblQue iCompletedQ;				/**< @internalComponent */

	TDfc iDfc;							/**< @internalComponent */

	TUint8 iTransferringCancelled;		/**< @internalComponent */

	TUint8 iCriticalCancelled;			/**< @internalComponent */

	TUint8 iPad1;						/**< @internalComponent */

	TUint8 iPad2;						/**< @internalComponent */

	TDebugFn iDebugFn;					/**< @internalComponent */

	TAny* iDebugPtr;					/**< @internalComponent */

	TInt iTickPeriod;					/**< @internalComponent */	// in microseconds

	/**

	This member is intended for use by ASSP/variant interrupt code as a convenient

	location to store rounding error information where hardware interrupts are not

	exactly one millisecond. The Symbian kernel does not make any use of this member.

	@publishedPartner

	@released

	*/

	TInt iRounding;

	};

GLREF_D NTimerQ TheTimerQ;

/**

@internalComponent

*/

inline TUint32 NTickCount()

	{return TheTimerQ.iMsCount;}

/**

@internalComponent

*/

inline TInt NTickPeriod()

	{return TheTimerQ.iTickPeriod;}

extern "C" {

/**

@internalComponent

*/

extern void NKCrashHandler(TInt aPhase, const TAny* a0, TInt a1);

/**

@internalComponent

*/

extern TUint32 CrashState;

}

#define	__ACQUIRE_BTRACE_LOCK()

#define	__RELEASE_BTRACE_LOCK()

/**

@internalComponent

*/

TBool InterruptsStatus(TBool aRequest);

//declarations for the checking of kernel preconditions

/**

@internalComponent

PRECOND_FUNCTION_CALLER is needed for __ASSERT_WITH_MESSAGE_ALWAYS(),

so is outside the #ifdef _DEBUG.

*/

#ifndef PRECOND_FUNCTION_CALLER

#define PRECOND_FUNCTION_CALLER		0