// 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\nkern.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 __NKERN_H__

#define __NKERN_H__

#ifdef	__STANDALONE_NANOKERNEL__

#undef	__IN_KERNEL__

#define	__IN_KERNEL__

#endif

#include <e32const.h>

#include <nklib.h>

#include <dfcs.h>

#include <nk_trace.h>

#include <e32atomics.h>

extern "C" {

/** @internalComponent */

IMPORT_C void NKFault(const char* file, TInt line);

/** @internalComponent */

void NKIdle(TInt aStage);

}

/**

@publishedPartner

@released

*/

#define FAULT()		NKFault(__FILE__,__LINE__)

#ifdef _DEBUG

/**

@publishedPartner

@released

*/

#define __NK_ASSERT_DEBUG(c)	((void) ((c)||(FAULT(),0)) )

#else

#define __NK_ASSERT_DEBUG(c)

#endif

/**

@publishedPartner

@released

*/

#define __NK_ASSERT_ALWAYS(c)	((void) ((c)||(FAULT(),0)) )

/**

	@publishedPartner

	@released

*/

const TInt KNumPriorities=64;

const TInt KMaxCpus=8;

class NThread;

/** Spin lock

	Used for protecting a code fragment against both interrupts and concurrent

	execution on another processor.

	@internalComponent

*/

class TSpinLock

	{

public:

	enum TOrder

		{

		// Bit 7 of order clear for locks used with interrupts disabled

		EOrderGenericIrqLow0	=0x00u,	// Device driver spin locks, low range

		EOrderGenericIrqLow1	=0x01u,	// Device driver spin locks, low range

		EOrderGenericIrqLow2	=0x02u,	// Device driver spin locks, low range

		EOrderGenericIrqLow3	=0x03u,	// Device driver spin locks, low range

		EOrderGenericIrqHigh0	=0x18u,	// Device driver spin locks, high range

		EOrderGenericIrqHigh1	=0x19u,	// Device driver spin locks, high range

		EOrderGenericIrqHigh2	=0x1Au,	// Device driver spin locks, high range

		EOrderGenericIrqHigh3	=0x1Bu,	// Device driver spin locks, high range

		// Bit 7 of order set for locks used with interrupts enabled, preemption disabled

		EOrderGenericPreLow0	=0x80u,		// Device driver spin locks, low range

		EOrderGenericPreLow1	=0x81u,		// Device driver spin locks, low range

		EOrderGenericPreHigh0	=0x9Eu,		// Device driver spin locks, high range

		EOrderGenericPreHigh1	=0x9Fu,		// Device driver spin locks, high range

		EOrderNone				=0xFFu	// No order check required (e.g. for dynamic ordering)

		};

public:

	IMPORT_C TSpinLock(TUint aOrder);

private:

	volatile TUint64 iLock;

	};

/** Macro to disable interrupts and acquire the lock.

@publishedPartner

@prototype

*/

#define __SPIN_LOCK_IRQ(lock)					((void)NKern::DisableAllInterrupts())

/** Macro to release the lock and enable interrupts.

@publishedPartner

@prototype

*/

#define __SPIN_UNLOCK_IRQ(lock)					(NKern::EnableAllInterrupts())

/** Macro to see if someone else is waiting for the lock, enabling IRQs 

    then disabling IRQs again.

@publishedPartner

@prototype

*/

#define __SPIN_FLASH_IRQ(lock)					(NKern::EnableAllInterrupts(),(void)NKern::DisableAllInterrupts(),((TBool)TRUE))

/** Macro to remember original interrupt state then disable interrupts 

    and acquire the lock.

@publishedPartner

@prototype

*/

#define __SPIN_LOCK_IRQSAVE(lock)				(NKern::DisableAllInterrupts())

/** Macro to release the lock then restore original interrupt state to that 

	supplied.

@publishedPartner

@prototype

*/

#define __SPIN_UNLOCK_IRQRESTORE(lock,irq)		(NKern::RestoreInterrupts(irq))

/** Macro to see if someone else is waiting for the lock, enabling IRQs to

	the original state supplied then disabling IRQs again.

@publishedPartner

@prototype

*/

#define __SPIN_FLASH_IRQRESTORE(lock,irq)		(NKern::RestoreInterrupts(irq),((void)NKern::DisableAllInterrupts()),((TBool)TRUE))

/** Macro to acquire the lock. This assumes the caller has already disabled 

    interrupts/preemption. 

	If interrupts/preemption is not disabled a run-time assert will occur

	This is to protect against unsafe code that might lead to same core 

	deadlock.

    In device driver code it is safer to use __SPIN_LOCK_IRQSAVE() instead, 

	although not as efficient should interrupts aleady be disabled for the 

	duration the lock is held.

@publishedPartner

@prototype

*/

#define __SPIN_LOCK(lock)

/** Macro to release the lock, don't change interrupt/preemption state.

@publishedPartner

@prototype

*/

#define __SPIN_UNLOCK(lock)

/**

@internalComponent

*/

#define __SPIN_FLASH(lock)						((TBool)FALSE)

/** Macro to see if someone else is waiting for the lock, enabling preemption 

    then disabling it again.

@publishedPartner

@prototype

*/

#define __SPIN_FLASH_PREEMPT(lock)				((TBool)NKern::PreemptionPoint())

/** Read/Write Spin lock

	@internalComponent

*/

class TRWSpinLock

	{

public:

	IMPORT_C TRWSpinLock(TUint aOrder);		// Uses same order space as TSpinLock

private:

	volatile TUint64 iLock;

	};

/**

@publishedPartner

@prototype

*/

#define __SPIN_LOCK_IRQ_R(lock)					((void)NKern::DisableAllInterrupts())

/**

@publishedPartner

@prototype

*/

#define __SPIN_UNLOCK_IRQ_R(lock)				(NKern::EnableAllInterrupts())

/**

@publishedPartner

@prototype

*/

#define __SPIN_FLASH_IRQ_R(lock)				(NKern::EnableAllInterrupts(),(void)NKern::DisableAllInterrupts(),((TBool)TRUE))

/**

@publishedPartner

@prototype

*/

#define __SPIN_LOCK_IRQ_W(lock)					((void)NKern::DisableAllInterrupts())

/**

@publishedPartner

@prototype

*/

#define __SPIN_UNLOCK_IRQ_W(lock)				(NKern::EnableAllInterrupts())

/**

@publishedPartner

@prototype

*/

#define __SPIN_FLASH_IRQ_W(lock)				(NKern::EnableAllInterrupts(),(void)NKern::DisableAllInterrupts(),((TBool)TRUE))

/**

@publishedPartner

@prototype

*/

#define __SPIN_LOCK_R(lock)						

/**

@publishedPartner

@prototype

*/

#define __SPIN_UNLOCK_R(lock)					

/**

@internalComponent

*/

#define __SPIN_FLASH_R(lock)					((TBool)FALSE)

/**

@publishedPartner

@prototype

*/

#define __SPIN_LOCK_W(lock)						

/**

@publishedPartner

@prototype

*/

#define __SPIN_UNLOCK_W(lock)					

/**

@internalComponent

*/

#define __SPIN_FLASH_W(lock)					((TBool)FALSE)

/**

@publishedPartner

@prototype

*/

#define __SPIN_LOCK_IRQSAVE_R(lock)				(NKern::DisableAllInterrupts())

/**

@publishedPartner

@prototype

*/

#define __SPIN_UNLOCK_IRQRESTORE_R(lock,irq)	(NKern::RestoreInterrupts(irq))

/**

@publishedPartner

@prototype

*/

#define __SPIN_FLASH_IRQRESTORE_R(lock,irq)		(NKern::RestoreInterrupts(irq),((void)NKern::DisableAllInterrupts()),((TBool)TRUE))

/**

@publishedPartner

@prototype

*/

#define __SPIN_LOCK_IRQSAVE_W(lock)				(NKern::DisableAllInterrupts())

/**

@publishedPartner

@prototype

*/

#define __SPIN_UNLOCK_IRQRESTORE_W(lock,irq)	(NKern::RestoreInterrupts(irq))

/**

@publishedPartner

@prototype

*/

#define __SPIN_FLASH_IRQRESTORE_W(lock,irq)		(NKern::RestoreInterrupts(irq),((void)NKern::DisableAllInterrupts()),((TBool)TRUE))

/**

@publishedPartner

@prototype

*/

#define __SPIN_FLASH_PREEMPT_R(lock)			((TBool)NKern::PreemptionPoint())

/**

@publishedPartner

@prototype

*/

#define __SPIN_FLASH_PREEMPT_W(lock)			((TBool)NKern::PreemptionPoint())

/** Nanokernel fast semaphore

	A light-weight semaphore class that only supports a single waiting thread,

	suitable for the Symbian OS thread I/O semaphore.

	Initialising a NFastSemaphore involves two steps:

	- Constructing the semaphore

	- Setting the semaphore owning thread (the one allowed to wait on it)

	For example, creating one for the current thread to wait on:

	@code

	NFastSemaphore sem;

	sem.iOwningThread = NKern::CurrentThread();

	@endcode

	@publishedPartner

	@released

*/

class NFastSemaphore

	{

public:

	inline NFastSemaphore();

	inline NFastSemaphore(NThreadBase* aThread);

	IMPORT_C void SetOwner(NThreadBase* aThread);

	IMPORT_C void Wait();

	IMPORT_C void Signal();

	IMPORT_C void SignalN(TInt aCount);

	IMPORT_C void Reset();

	void WaitCancel();

public:

	TInt iCount;				/**< @internalComponent */

	/** The thread allowed to wait on the semaphore

		@internalComponent

	*/

	NThreadBase* iOwningThread;	

	};

/** Create a fast semaphore

	@publishedPartner

	@released

*/

inline NFastSemaphore::NFastSemaphore()

	: iCount(0), iOwningThread(NULL)

	{}

/** Nanokernel fast mutex

	A light-weight priority-inheritance mutex that can be used if the following

	conditions apply:

	- Threads that hold the mutex never block.

	- The mutex is never acquired in a nested fashion

	If either of these conditions is not met, a DMutex object is more appropriate.

	@publishedPartner

	@released

*/

class NFastMutex

	{

public:

	IMPORT_C NFastMutex();

	IMPORT_C void Wait();

	IMPORT_C void Signal();

	IMPORT_C TBool HeldByCurrentThread();	/**< @internalComponent */

public:

	NThreadBase* iHoldingThread;	/**< @internalComponent */

	/** MUST ALWAYS BE 0 or 1

		@internalComponent

	*/

	TInt iWaiting;

	};

/**

@publishedPartner

@released

The type of the callback function used by the nanokernel timer. 

@see NTimer

*/

typedef void (*NTimerFn)(TAny*);

/**

@publishedPartner

@released

A basic relative timer provided by the nanokernel.

It can generate either a one-shot interrupt or periodic interrupts.

A timeout handler is called when the timer expires, either:

- from the timer ISR - if the timer is queued via OneShot(TInt aTime) or OneShot(TInt aTime, TBool EFalse), or

- from the nanokernel timer dfc1 thread - if the timer is queued via OneShot(TInt aTime, TBool ETrue) call, or

- from any other dfc thread that provided DFC belongs to - if the timer is queued via OneShot(TInt aTime, TDfc& aDfc) call.

Call-back mechanism cannot be changed in the life time of a timer.

These timer objects may be manipulated from any context.

The timers are driven from a periodic system tick interrupt,

usually a 1ms period.

@see NTimerFn

*/

class NTimer : public SDblQueLink

	{

public:

	/**

	Default constructor.

	*/

	inline NTimer()

		: iState(EIdle)

		{}

	/**

	Constructor taking a callback function and a pointer to be passed

	to the callback function.

	@param aFunction The callback function.

	@param aPtr      A pointer to be passed to the callback function 

	                 when called.

	*/

	inline NTimer(NTimerFn aFunction, TAny* aPtr)

		: iPtr(aPtr), iFunction(aFunction), iState(EIdle)

		{}

	IMPORT_C TInt OneShot(TInt aTime);

	IMPORT_C TInt OneShot(TInt aTime, TBool aDfc);

	IMPORT_C TInt OneShot(TInt aTime, TDfc& aDfc);

	IMPORT_C TInt Again(TInt aTime);

	IMPORT_C TBool Cancel();

	IMPORT_C TBool IsPending();

public:

/**

	@internalComponent

*/

	enum TState

		{

		EIdle=0,			// not queued

		ETransferring=1,	// being transferred from holding to ordered queue

		EHolding=2,			// on holding queue

		EOrdered=3,			// on ordered queue

		ECritical=4,		// on ordered queue and in use by queue walk routine

		EFinal=5,			// on final queue

		};

public:

	/** Argument for callback function or the pointer to TDfc */

	TAny* iPtr;				/**< @internalComponent */

	/** Pointer to callback function. NULL value indicates that queuing of provided Dfc queue will be done

	instead of calling callback function on completion */

	NTimerFn iFunction;		/**< @internalComponent */

	TUint32 iTriggerTime;	/**< @internalComponent */

	TUint8 iCompleteInDfc;	/**< @internalComponent */

	TUint8 iState;			/**< @internalComponent */

	TUint8 iPad1;			/**< @internalComponent */

	/** Available for timer client to use.

		@internalTechnology */

	TUint8 iUserFlags;

	};

/**

@internalTechnology

*/

#define	i_NTimer_iUserFlags	iUserFlags

/**

@internalComponent

*/

#define	i_NTimer_iState		iState

/**

	@publishedPartner

	@released

*/

typedef void (*NThreadFunction)(TAny*);

/**

	@publishedPartner

	@released

*/

typedef TDfc* (*NThreadExitHandler)(NThread*);

/**

	@publishedPartner

	@released

*/

typedef void (*NThreadStateHandler)(NThread*,TInt,TInt);

/**

	@publishedPartner

	@released

*/

typedef void (*NThreadExceptionHandler)(TAny*,NThread*);

/**

	@publishedPartner

	@released

*/

typedef void (*NThreadTimeoutHandler)(NThread*,TInt);

/**

	@publishedPartner

	@released

*/

struct SNThreadHandlers

	{

	NThreadExitHandler iExitHandler;

	NThreadStateHandler iStateHandler;

	NThreadExceptionHandler iExceptionHandler;

	NThreadTimeoutHandler iTimeoutHandler;

	};

/** @internalComponent */

extern void NThread_Default_State_Handler(NThread*, TInt, TInt);

/** @internalComponent */

extern void NThread_Default_Exception_Handler(TAny*, NThread*);

/** @internalComponent */

#define NTHREAD_DEFAULT_EXIT_HANDLER		((NThreadExitHandler)0)

/** @internalComponent */

#define	NTHREAD_DEFAULT_STATE_HANDLER		(&NThread_Default_State_Handler)

/** @internalComponent */

#define	NTHREAD_DEFAULT_EXCEPTION_HANDLER	(&NThread_Default_Exception_Handler)

/** @internalComponent */

#define	NTHREAD_DEFAULT_TIMEOUT_HANDLER		((NThreadTimeoutHandler)0)

/**

	@publishedPartner

	@released

*/

struct SFastExecTable

	{

	TInt iFastExecCount;			// includes implicit function#0

	TLinAddr iFunction[1];			// first entry is for call number 1

	};

/**

	@publishedPartner

	@released

*/

const TUint32 KExecFlagClaim=0x80000000;		// claim system lock

/**

	@publishedPartner

	@released

*/

const TUint32 KExecFlagRelease=0x40000000;		// release system lock

/**

	@publishedPartner

	@released

*/

const TUint32 KExecFlagPreprocess=0x20000000;	// preprocess

/**

	@publishedPartner

	@released

*/

const TUint32 KExecFlagExtraArgMask=0x1C000000;	// 3 bits indicating additional arguments

/**

	@publishedPartner

	@released

*/

const TUint32 KExecFlagExtraArgs2=0x04000000;	// 2 additional arguments

/**

	@publishedPartner

	@released

*/

const TUint32 KExecFlagExtraArgs3=0x08000000;	// 3 additional arguments

/**

	@publishedPartner

	@released

*/

const TUint32 KExecFlagExtraArgs4=0x0C000000;	// 4 additional arguments

/**

	@publishedPartner

	@released

*/

const TUint32 KExecFlagExtraArgs5=0x10000000;	// 5 additional arguments

/**

	@publishedPartner

	@released

*/

const TUint32 KExecFlagExtraArgs6=0x14000000;	// 6 additional arguments

/**

	@publishedPartner

	@released

*/

const TUint32 KExecFlagExtraArgs7=0x18000000;	// 7 additional arguments

/**

	@publishedPartner

	@released

*/

const TUint32 KExecFlagExtraArgs8=0x1C000000;	// 8 additional arguments

/**

	@publishedPartner

	@released

*/

struct SSlowExecEntry

	{

	TUint32 iFlags;					// information about call

	TLinAddr iFunction;				// address of function to be called

	};

/**

	@publishedPartner

	@released

*/

struct SSlowExecTable

	{

	TInt iSlowExecCount;

	TLinAddr iInvalidExecHandler;	// used if call number invalid

	TLinAddr iPreprocessHandler;	// used for handle lookups

	SSlowExecEntry iEntries[1];		// first entry is for call number 0

	};

// Thread iAttributes Constants

const TUint8 KThreadAttImplicitSystemLock=1;	/**< @internalComponent */

const TUint8 KThreadAttAddressSpace=2;			/**< @internalComponent */

const TUint8 KThreadAttLoggable=4;				/**< @internalComponent */

const TUint8 KThreadAttDelayed=8;				/**< @internalComponent */

// Thread CPU

const TUint32 KCpuAffinityAny=0xffffffffu;		/**< @internalComponent */

/** Information needed for creating a nanothread.

	@publishedPartner

	@released

*/

struct SNThreadCreateInfo

	{

	NThreadFunction iFunction;

	TAny* iStackBase;

	TInt iStackSize;

	TInt iPriority;

	TInt iTimeslice;

	TUint8 iAttributes;

	TUint32 iCpuAffinity;

	const SNThreadHandlers* iHandlers;

	const SFastExecTable* iFastExecTable;

	const SSlowExecTable* iSlowExecTable;

	const TUint32* iParameterBlock;

	TInt iParameterBlockSize;		// if zero, iParameterBlock _is_ the initial data

									// otherwise it points to n bytes of initial data

	};

/**	Constant for use with NKern:: functions which release a fast mutex as well

	as performing some other operations.

	@publishedPartner

	@released

*/

#define	SYSTEM_LOCK		(NFastMutex*)0

/** Idle handler function

	Pointer to a function which is called whenever a CPU goes idle

	@param	aPtr	The iPtr stored in the SCpuIdleHandler structure

	@param	aStage	If positive, the number of processors still active

					If zero, indicates all processors are now idle

					-1 indicates that postamble processing is required after waking up

	@internalComponent

*/

typedef void (*TCpuIdleHandlerFn)(TAny* aPtr, TInt aStage);

/** Idle handler structure

	@internalComponent

*/

struct SCpuIdleHandler

	{

	TCpuIdleHandlerFn	iHandler;

	TAny*				iPtr;

	volatile TBool		iPostambleRequired;

	};

/**

@internalComponent

*/

enum TUserModeCallbackReason

	{

	EUserModeCallbackRun,

	EUserModeCallbackCancel,

	};

/**

A callback function executed when a thread returns to user mode.

@internalComponent

*/

typedef void (*TUserModeCallbackFunc)(TAny* aThisPtr, TUserModeCallbackReason aReasonCode);

/**

An object representing a queued callback to be executed when a thread returns to user mode.

@internalComponent

*/

class TUserModeCallback

	{

public:

	TUserModeCallback(TUserModeCallbackFunc);

	~TUserModeCallback();

public:

	TUserModeCallback* volatile iNext;

	TUserModeCallbackFunc iFunc;

	};

TUserModeCallback* const KUserModeCallbackUnqueued = ((TUserModeCallback*)1);

/** Nanokernel functions

	@publishedPartner

	@released

*/

class NKern

	{

public:

	/** Bitmask values used when blocking a nanothread.

		@see NKern::Block()

	 */

	enum TBlockMode 

		{

		EEnterCS=1,		/**< Enter thread critical section before blocking */

		ERelease=2,		/**< Release specified fast mutex before blocking */

		EClaim=4,		/**< Re-acquire specified fast mutex when unblocked */

		EObstruct=8,	/**< Signifies obstruction of thread rather than lack of work to do */

		};

	/** Values that specify the context of the processor.

		@see NKern::CurrentContext()

	*/

	enum TContext

		{

		EThread=0,			/**< The processor is in a thread context*/

		EIDFC=1,			/**< The processor is in an IDFC context*/

		EInterrupt=2,		/**< The processor is in an interrupt context*/

		EEscaped=KMaxTInt	/**< Not valid a process context on target hardware*/

		};

public:

	// Threads

	IMPORT_C static TInt ThreadCreate(NThread* aThread, SNThreadCreateInfo& anInfo);

	IMPORT_C static TBool ThreadSuspend(NThread* aThread, TInt aCount);

	IMPORT_C static TBool ThreadResume(NThread* aThread);

	IMPORT_C static TBool ThreadResume(NThread* aThread, NFastMutex* aMutex);

	IMPORT_C static TBool ThreadForceResume(NThread* aThread);

	IMPORT_C static TBool ThreadForceResume(NThread* aThread, NFastMutex* aMutex);

	IMPORT_C static void ThreadRelease(NThread* aThread, TInt aReturnValue);

	IMPORT_C static void ThreadRelease(NThread* aThread, TInt aReturnValue, NFastMutex* aMutex);

	IMPORT_C static void ThreadSetPriority(NThread* aThread, TInt aPriority);

	IMPORT_C static void ThreadSetPriority(NThread* aThread, TInt aPriority, NFastMutex* aMutex);

	IMPORT_C static void ThreadRequestSignal(NThread* aThread);

	IMPORT_C static void ThreadRequestSignal(NThread* aThread, NFastMutex* aMutex);

	IMPORT_C static void ThreadRequestSignal(NThread* aThread, TInt aCount);

	IMPORT_C static void ThreadKill(NThread* aThread);

	IMPORT_C static void ThreadKill(NThread* aThread, NFastMutex* aMutex);

	IMPORT_C static void ThreadEnterCS();

	IMPORT_C static void ThreadLeaveCS();

	static NThread* _ThreadEnterCS();		/**< @internalComponent */

	static void _ThreadLeaveCS();			/**< @internalComponent */

	IMPORT_C static TInt Block(TUint32 aTimeout, TUint aMode, NFastMutex* aMutex);

	IMPORT_C static TInt Block(TUint32 aTimeout, TUint aMode);

	IMPORT_C static void NanoBlock(TUint32 aTimeout, TUint aState, TAny* aWaitObj);

	IMPORT_C static void ThreadGetUserContext(NThread* aThread, TAny* aContext, TUint32& aAvailRegistersMask);

	IMPORT_C static void ThreadSetUserContext(NThread* aThread, TAny* aContext);

	IMPORT_C static void ThreadGetSystemContext(NThread* aThread, TAny* aContext, TUint32& aAvailRegistersMask);

	static void ThreadModifyUsp(NThread* aThread, TLinAddr aUsp);

	IMPORT_C static TInt FreezeCpu();													/**< @internalComponent */

	IMPORT_C static void EndFreezeCpu(TInt aCookie);									/**< @internalComponent */

	IMPORT_C static TUint32 ThreadSetCpuAffinity(NThread* aThread, TUint32 aAffinity);	/**< @internalComponent */

	IMPORT_C static void ThreadSetTimeslice(NThread* aThread, TInt aTimeslice);			/**< @internalComponent */

	IMPORT_C static TUint64 ThreadCpuTime(NThread* aThread);							/**< @internalComponent */

	IMPORT_C static TUint32 CpuTimeMeasFreq();											/**< @internalComponent */

	static TInt QueueUserModeCallback(NThreadBase* aThread, TUserModeCallback* aCallback);	/**< @internalComponent */

	static void MoveUserModeCallbacks(NThreadBase* aSrcThread, NThreadBase* aDestThread);	/**< @internalComponent */

	static void CancelUserModeCallbacks();												/**< @internalComponent */

	// Fast semaphores

	IMPORT_C static void FSSetOwner(NFastSemaphore* aSem,NThreadBase* aThread);

	IMPORT_C static void FSWait(NFastSemaphore* aSem);

	IMPORT_C static void FSSignal(NFastSemaphore* aSem);

	IMPORT_C static void FSSignal(NFastSemaphore* aSem, NFastMutex* aMutex);

	IMPORT_C static void FSSignalN(NFastSemaphore* aSem, TInt aCount);

	IMPORT_C static void FSSignalN(NFastSemaphore* aSem, TInt aCount, NFastMutex* aMutex);

	// Fast mutexes

	IMPORT_C static void FMWait(NFastMutex* aMutex);

	IMPORT_C static void FMSignal(NFastMutex* aMutex);

	IMPORT_C static TBool FMFlash(NFastMutex* aMutex);

	// Scheduler

	IMPORT_C static void Lock();

	IMPORT_C static NThread* LockC();	

	IMPORT_C static void Unlock();

	IMPORT_C static TInt PreemptionPoint();

	// Interrupts

	IMPORT_C static TInt DisableAllInterrupts();

	IMPORT_C static TInt DisableInterrupts(TInt aLevel);

	IMPORT_C static void RestoreInterrupts(TInt aRestoreData);

	IMPORT_C static void EnableAllInterrupts();

	// Read-modify-write

	inline static TInt LockedInc(TInt& aCount)

		{ return __e32_atomic_add_ord32(&aCount,1); }

	inline static TInt LockedDec(TInt& aCount)

		{ return __e32_atomic_add_ord32(&aCount,0xffffffff); }

	inline static TInt LockedAdd(TInt& aDest, TInt aSrc)

		{ return __e32_atomic_add_ord32(&aDest,aSrc); }

	inline static TInt64 LockedInc(TInt64& aCount)

		{ return __e32_atomic_add_ord64(&aCount,1); }

	inline static TInt64 LockedDec(TInt64& aCount)

		{ return __e32_atomic_add_ord64(&aCount,TUint64(TInt64(-1))); }

	inline static TInt64 LockedAdd(TInt64& aDest, TInt64 aSrc)		/**< @internalComponent */

		{ return __e32_atomic_add_ord64(&aDest,aSrc); }

	inline static TUint32 LockedSetClear(TUint32& aDest, TUint32 aClearMask, TUint32 aSetMask)

		{ return __e32_atomic_axo_ord32(&aDest,~(aClearMask|aSetMask),aSetMask); }

	inline static TUint16 LockedSetClear16(TUint16& aDest, TUint16 aClearMask, TUint16 aSetMask)	/**< @internalComponent */

		{ return __e32_atomic_axo_ord16(&aDest,TUint16(~(aClearMask|aSetMask)),aSetMask); }

	inline static TUint8 LockedSetClear8(TUint8& aDest, TUint8 aClearMask, TUint8 aSetMask)

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

	inline static TInt SafeInc(TInt& aCount)

		{ return __e32_atomic_tas_ord32(&aCount,1,1,0); }

	inline static TInt SafeDec(TInt& aCount)

		{ return __e32_atomic_tas_ord32(&aCount,1,-1,0); }

	inline static TInt AddIfGe(TInt& aCount, TInt aLimit, TInt aInc)	/**< @internalComponent */

		{ return __e32_atomic_tas_ord32(&aCount,aLimit,aInc,0); }

	inline static TInt AddIfLt(TInt& aCount, TInt aLimit, TInt aInc)	/**< @internalComponent */

		{ return __e32_atomic_tas_ord32(&aCount,aLimit,0,aInc); }

	inline static TAny* SafeSwap(TAny* aNewValue, TAny*& aPtr)

		{ return __e32_atomic_swp_ord_ptr(&aPtr, aNewValue); }

	inline static TUint8 SafeSwap8(TUint8 aNewValue, TUint8& aPtr)

		{ return __e32_atomic_swp_ord8(&aPtr, aNewValue); }

	inline static TUint16 SafeSwap16(TUint16 aNewValue, TUint16& aPtr)						/**< @internalComponent */

		{ return __e32_atomic_swp_ord16(&aPtr, aNewValue); }

	inline static TBool CompareAndSwap(TAny*& aPtr, TAny* aExpected, TAny* aNew)			/**< @internalComponent */

		{ return __e32_atomic_cas_ord_ptr(&aPtr, &aExpected, aNew); }

	inline static TBool CompareAndSwap8(TUint8& aPtr, TUint8 aExpected, TUint8 aNew)		/**< @internalComponent */

		{ return __e32_atomic_cas_ord8(&aPtr, (TUint8*)&aExpected, (TUint8)aNew); }

	inline static TBool CompareAndSwap16(TUint16& aPtr, TUint16 aExpected, TUint16 aNew)	/**< @internalComponent */

		{ return __e32_atomic_cas_ord16(&aPtr, (TUint16*)&aExpected, (TUint16)aNew); }

	inline static TUint32 SafeSwap(TUint32 aNewValue, TUint32& aPtr)						/**< @internalComponent */

		{ return __e32_atomic_swp_ord32(&aPtr, aNewValue); }

	inline static TUint SafeSwap(TUint aNewValue, TUint& aPtr)								/**< @internalComponent */

		{ return __e32_atomic_swp_ord32(&aPtr, aNewValue); }

	inline static TInt SafeSwap(TInt aNewValue, TInt& aPtr)									/**< @internalComponent */

		{ return __e32_atomic_swp_ord32(&aPtr, aNewValue); }

	inline static TBool CompareAndSwap(TUint32& aPtr, TUint32 aExpected, TUint32 aNew)		/**< @internalComponent */

		{ return __e32_atomic_cas_ord32(&aPtr, &aExpected, aNew); }

	inline static TBool CompareAndSwap(TUint& aPtr, TUint aExpected, TUint aNew)			/**< @internalComponent */

		{ return __e32_atomic_cas_ord32(&aPtr, (TUint32*)&aExpected, (TUint32)aNew); }

	inline static TBool CompareAndSwap(TInt& aPtr, TInt aExpected, TInt aNew)				/**< @internalComponent */

		{ return __e32_atomic_cas_ord32(&aPtr, (TUint32*)&aExpected, (TUint32)aNew); }

	// Miscellaneous

	IMPORT_C static NThread* CurrentThread();

	IMPORT_C static TInt CurrentCpu();										/**< @internalComponent */

	IMPORT_C static TInt NumberOfCpus();									/**< @internalComponent */

	IMPORT_C static void LockSystem();

	IMPORT_C static void UnlockSystem();

	IMPORT_C static TBool FlashSystem();

	IMPORT_C static void WaitForAnyRequest();

	IMPORT_C static void Sleep(TUint32 aTime);

	IMPORT_C static void Exit();

	IMPORT_C static void DeferredExit();

	IMPORT_C static void YieldTimeslice();									/**< @internalComponent */

	IMPORT_C static void RotateReadyList(TInt aPriority);					

	IMPORT_C static void RotateReadyList(TInt aPriority, TInt aCpu);		/**< @internalTechnology */

	IMPORT_C static void RecordIntLatency(TInt aLatency, TInt aIntMask);	/**< @internalTechnology */

	IMPORT_C static void RecordThreadLatency(TInt aLatency);				/**< @internalTechnology */

	IMPORT_C static TUint32 TickCount();

	IMPORT_C static TInt TickPeriod();

	IMPORT_C static TInt TimerTicks(TInt aMilliseconds);

	IMPORT_C static TInt TimesliceTicks(TUint32 aMicroseconds);				/**< @internalTechnology */

	IMPORT_C static TInt CurrentContext();

	IMPORT_C static TUint32 FastCounter();

	IMPORT_C static TInt FastCounterFrequency();

	static void Init0(TAny* aVariantData);

	static void Init(NThread* aThread, SNThreadCreateInfo& anInfo);

	IMPORT_C static TBool KernelLocked(TInt aCount=0);						/**< @internalTechnology */

	IMPORT_C static NFastMutex* HeldFastMutex();							/**< @internalTechnology */

	static void Idle();	

	IMPORT_C static SCpuIdleHandler* CpuIdleHandler();						/**< @internalTechnology */

	static void NotifyCrash(const TAny* a0, TInt a1);						/**< @internalTechnology */

	IMPORT_C static TBool Crashed();

	static TUint32 IdleGenerationCount();

	// Debugger support

	typedef void (*TRescheduleCallback)(NThread*);

	IMPORT_C static void SchedulerHooks(TLinAddr& aStart, TLinAddr& aEnd);

	IMPORT_C static void InsertSchedulerHooks();

	IMPORT_C static void RemoveSchedulerHooks();

	IMPORT_C static void SetRescheduleCallback(TRescheduleCallback aCallback);

	};

/** Create a fast semaphore

	@publishedPartner

	@released

*/

inline NFastSemaphore::NFastSemaphore(NThreadBase* aThread)

	:	iCount(0),

		iOwningThread(aThread ? aThread : (NThreadBase*)NKern::CurrentThread())

	{

	}

#endif