sl@0: // Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of the License "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: // e32\nkern\nkerns.cpp
sl@0: // 
sl@0: //
sl@0: 
sl@0: // NThreadBase member data
sl@0: #define __INCLUDE_NTHREADBASE_DEFINES__
sl@0: 
sl@0: #include <e32cmn.h>
sl@0: #include <e32cmn_private.h>
sl@0: #include "nk_priv.h"
sl@0: 
sl@0: extern "C" void ExcFault(TAny*);
sl@0: 
sl@0: /******************************************************************************
sl@0:  * Thread
sl@0:  ******************************************************************************/
sl@0: 
sl@0: void InvalidExec()
sl@0: 	{
sl@0: 	FAULT();
sl@0: 	}
sl@0: 
sl@0: static const SFastExecTable DefaultFastExecTable={0,{0}};
sl@0: static const SSlowExecTable DefaultSlowExecTable={0,(TLinAddr)InvalidExec,0,{{0,0}}};
sl@0: 
sl@0: const SNThreadHandlers NThread_Default_Handlers =
sl@0: 	{
sl@0: 	NTHREAD_DEFAULT_EXIT_HANDLER,
sl@0: 	NTHREAD_DEFAULT_STATE_HANDLER,
sl@0: 	NTHREAD_DEFAULT_EXCEPTION_HANDLER,
sl@0: 	NTHREAD_DEFAULT_TIMEOUT_HANDLER
sl@0: 	};
sl@0: 
sl@0: /** Create a fast mutex
sl@0: 
sl@0: 	@publishedPartner
sl@0: 	@released
sl@0: */
sl@0: EXPORT_C NFastMutex::NFastMutex()
sl@0: 	: iHoldingThread(0), iWaiting(0)
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: /** Create a spin lock
sl@0: 
sl@0: 	@internalComponent
sl@0: */
sl@0: EXPORT_C TSpinLock::TSpinLock(TUint)
sl@0: 	: iLock(0)
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: /** Create a R/W spin lock
sl@0: 
sl@0: 	@internalComponent
sl@0: */
sl@0: EXPORT_C TRWSpinLock::TRWSpinLock(TUint)
sl@0: 	: iLock(0)
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: NThreadBase::NThreadBase()
sl@0: 	{
sl@0: 	// from TPriListLink
sl@0: 	iPriority = 0;
sl@0: 	iSpare1 = 0;
sl@0: 	iSpare2 = 0;
sl@0: 	iSpare3 = 0;
sl@0: 
sl@0: 	iRequestSemaphore.iOwningThread=(NThreadBase*)this;
sl@0: 	new (&iTimer) NTimer(TimerExpired,this);
sl@0: 	iRequestSemaphore.iOwningThread = this;
sl@0: 
sl@0: 	iHeldFastMutex = 0;
sl@0: 	iWaitFastMutex = 0;
sl@0: 	iAddressSpace = 0;
sl@0: 	iTime = 0;
sl@0: 	iTimeslice = 0;
sl@0: 	iWaitObj = 0;
sl@0: 	iSuspendCount = 0;
sl@0: 	iCsCount = 0;
sl@0: 	iCsFunction = 0;
sl@0: 	iReturnValue = 0;	
sl@0: 	iStackBase = 0;
sl@0: 	iStackSize = 0;
sl@0: 	iHandlers = 0;
sl@0: 	iFastExecTable = 0;
sl@0: 	iSlowExecTable = 0;
sl@0: 	iSavedSP = 0;
sl@0: 	iExtraContext = 0;
sl@0: 	iExtraContextSize = 0;
sl@0: 	iLastStartTime = 0;
sl@0: 	iTotalCpuTime = 0;
sl@0: 	iTag = 0;
sl@0: 	iVemsData = 0;
sl@0: 	iUserModeCallbacks = 0;
sl@0: 	iSpare7 = 0;
sl@0: 	iSpare8 = 0;
sl@0: 	}
sl@0: 
sl@0: TInt NThreadBase::Create(SNThreadCreateInfo& aInfo, TBool aInitial)
sl@0: 	{
sl@0: 	if (aInfo.iPriority<0 || aInfo.iPriority>63)
sl@0: 		return KErrArgument;
sl@0: 	if (aInfo.iPriority==0 && !aInitial)
sl@0: 		return KErrArgument;
sl@0: 	new (this) NThreadBase;
sl@0: 	iStackBase=(TLinAddr)aInfo.iStackBase;
sl@0: 	iStackSize=aInfo.iStackSize;
sl@0: 	iTimeslice=(aInfo.iTimeslice>0)?aInfo.iTimeslice:-1;
sl@0: 	iTime=iTimeslice;
sl@0: #ifdef _DEBUG
sl@0: 	// When the crazy scheduler is active, refuse to set any priority higher than 1
sl@0: 	if (KCrazySchedulerEnabled())
sl@0: 		iPriority=TUint8(Min(1,aInfo.iPriority));
sl@0: 	else
sl@0: #endif
sl@0: 		{
sl@0: 		iPriority=TUint8(aInfo.iPriority);
sl@0: 		}
sl@0: 	iHandlers = aInfo.iHandlers ? aInfo.iHandlers : &NThread_Default_Handlers;
sl@0: 	iFastExecTable=aInfo.iFastExecTable?aInfo.iFastExecTable:&DefaultFastExecTable;
sl@0: 	iSlowExecTable=(aInfo.iSlowExecTable?aInfo.iSlowExecTable:&DefaultSlowExecTable)->iEntries;
sl@0: 	iSpare2=(TUint8)aInfo.iAttributes;		// iSpare2 is NThread attributes
sl@0: 	if (aInitial)
sl@0: 		{
sl@0: 		iNState=EReady;
sl@0: 		iSuspendCount=0;
sl@0: 		TheScheduler.Add(this);
sl@0: 		TheScheduler.iCurrentThread=this;
sl@0: 		TheScheduler.iKernCSLocked=0;		// now that current thread is defined
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		iNState=ESuspended;
sl@0: 		iSuspendCount=-1;
sl@0: 		}
sl@0: 	return KErrNone;
sl@0: 	}
sl@0: 
sl@0: void NThread_Default_State_Handler(NThread* __DEBUG_ONLY(aThread), TInt __DEBUG_ONLY(aOperation), TInt __DEBUG_ONLY(aParameter))
sl@0: 	{
sl@0: 	__KTRACE_OPT(KPANIC,DEBUGPRINT("Unknown NState %d: thread %T op %08x par %08x",aThread,aThread->iNState,aOperation,aParameter));
sl@0: 	FAULT();
sl@0: 	}
sl@0: 
sl@0: void NThread_Default_Exception_Handler(TAny* aContext, NThread*)
sl@0: 	{
sl@0: 	ExcFault(aContext);
sl@0: 	}
sl@0: 
sl@0: 
sl@0: /** Create a nanothread.
sl@0: 
sl@0: 	This function is intended to be used by the EPOC kernel and by personality
sl@0: 	layers. A nanothread may not use most of the functions available to normal
sl@0: 	Symbian OS threads. Use Kern::ThreadCreate() to create a Symbian OS thread.
sl@0: 
sl@0: 	@param aThread Pointer to control block for thread to create.
sl@0: 	@param aInfo Information needed for creating the thread.
sl@0: 
sl@0: 	@see SNThreadCreateInfo
sl@0: 	@see Kern::ThreadCreate
sl@0: 
sl@0: 	@pre	Call in a thread context.
sl@0: 	@pre	Interrupts must be enabled.
sl@0: 	@pre	Kernel must be unlocked.
sl@0:  */
sl@0: EXPORT_C TInt NKern::ThreadCreate(NThread* aThread, SNThreadCreateInfo& aInfo)
sl@0: 	{
sl@0: 	CHECK_PRECONDITIONS(MASK_KERNEL_UNLOCKED|MASK_INTERRUPTS_ENABLED|MASK_NOT_ISR|MASK_NOT_IDFC,"NKern::ThreadCreate");
sl@0: 	return aThread->Create(aInfo,FALSE);
sl@0: 	}
sl@0: 
sl@0: // User-mode callbacks
sl@0: 
sl@0: TUserModeCallback::TUserModeCallback(TUserModeCallbackFunc aFunc) :
sl@0: 	iNext(KUserModeCallbackUnqueued),
sl@0: 	iFunc(aFunc)
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: TUserModeCallback::~TUserModeCallback()
sl@0: 	{
sl@0: 	__NK_ASSERT_DEBUG(iNext == KUserModeCallbackUnqueued);
sl@0: 	}
sl@0: 
sl@0: TInt NKern::QueueUserModeCallback(NThreadBase* aThread, TUserModeCallback* aCallback)
sl@0: 	{
sl@0: 	if (aCallback->iNext != KUserModeCallbackUnqueued)
sl@0: 		return KErrInUse;
sl@0: 	TInt r = KErrDied;
sl@0: 	NKern::Lock();
sl@0: 	TUserModeCallback* listHead = aThread->iUserModeCallbacks;
sl@0: 	if (((TLinAddr)listHead & 3) == 0)
sl@0: 		{
sl@0: 		aCallback->iNext = listHead;
sl@0: 		aThread->iUserModeCallbacks = aCallback;
sl@0: 		r = KErrNone;
sl@0: 		}
sl@0: 	NKern::Unlock();
sl@0: 	return r;
sl@0: 	}
sl@0: 
sl@0: // Called with interrupts disabled
sl@0: // The vast majority of times this is called with zero or one callback pending
sl@0: void NThreadBase::CallUserModeCallbacks()
sl@0: 	{
sl@0: 	while (iUserModeCallbacks != NULL)
sl@0: 		{		
sl@0: 		// Remove first callback
sl@0: 		TUserModeCallback* callback = iUserModeCallbacks;
sl@0: 		iUserModeCallbacks = callback->iNext;
sl@0: 
sl@0: 		// Enter critical section to ensure callback is called
sl@0: 		NKern::ThreadEnterCS();
sl@0: 		
sl@0: 		// Re-enable interrupts and call callback
sl@0: 		NKern::EnableAllInterrupts();
sl@0: 		callback->iNext = KUserModeCallbackUnqueued;
sl@0: 		callback->iFunc(callback, EUserModeCallbackRun);
sl@0: 
sl@0: 		// Leave critical section: thread may die at this point
sl@0: 		NKern::ThreadLeaveCS();
sl@0: 		
sl@0: 		NKern::DisableAllInterrupts();
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: void NKern::CancelUserModeCallbacks()
sl@0: 	{
sl@0: 	// Call any queued callbacks with the EUserModeCallbackCancel reason code, in the current
sl@0: 	// thread.
sl@0: 
sl@0: 	NThreadBase* thread = NCurrentThread();
sl@0: 	NKern::Lock();	
sl@0: 	TUserModeCallback* listHead = thread->iUserModeCallbacks;
sl@0: 	thread->iUserModeCallbacks = NULL;
sl@0: 	NKern::Unlock();
sl@0: 	
sl@0: 	while (listHead != NULL)
sl@0: 		{
sl@0: 		TUserModeCallback* callback = listHead;
sl@0: 		listHead = listHead->iNext;
sl@0: 		callback->iNext = KUserModeCallbackUnqueued;
sl@0: 		callback->iFunc(callback, EUserModeCallbackCancel);
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: void NKern::MoveUserModeCallbacks(NThreadBase* aDestThread, NThreadBase* aSrcThread)
sl@0: 	{
sl@0: 	// Move all queued user-mode callbacks from the source thread to the destination thread, and
sl@0: 	// prevent any more from being queued.  Used by the kernel thread code so that callbacks get
sl@0: 	// cancelled in another thread if the thread they were originally queued on dies.
sl@0: 
sl@0: 	NKern::Lock();	
sl@0: 	TUserModeCallback* sourceListStart = aSrcThread->iUserModeCallbacks;
sl@0: 	aSrcThread->iUserModeCallbacks = (TUserModeCallback*)1;
sl@0: 	NKern::Unlock();
sl@0: 	__NK_ASSERT_DEBUG(((TUint)sourceListStart & 3) == 0);  // check this only gets called once per thread
sl@0: 
sl@0: 	if (sourceListStart == NULL)
sl@0: 		return;
sl@0: 
sl@0: 	TUserModeCallback* sourceListEnd = sourceListStart;
sl@0: 	while (sourceListEnd->iNext != NULL)
sl@0: 		sourceListEnd = sourceListEnd->iNext;
sl@0: 
sl@0: 	NKern::Lock();
sl@0: 	TUserModeCallback* destListStart = aDestThread->iUserModeCallbacks;
sl@0: 	__NK_ASSERT_DEBUG(((TUint)destListStart & 3) == 0);
sl@0: 	sourceListEnd->iNext = destListStart;
sl@0: 	aDestThread->iUserModeCallbacks = sourceListStart;
sl@0: 	NKern::Unlock();
sl@0: 	}
sl@0: 
sl@0: /** Initialise the null thread
sl@0: 	@internalComponent
sl@0: */
sl@0: void NKern::Init(NThread* aThread, SNThreadCreateInfo& aInfo)
sl@0: 	{
sl@0: 	aInfo.iFunction=NULL;			// irrelevant
sl@0: 	aInfo.iPriority=0;				// null thread has lowest priority
sl@0: 	aInfo.iTimeslice=0;				// null thread not timesliced
sl@0: 	aInfo.iAttributes=0;			// null thread does not require implicit locks
sl@0: 	aThread->Create(aInfo,TRUE);	// create the null thread
sl@0: 	}
sl@0: 
sl@0: extern "C" {
sl@0: TUint32 CrashState;
sl@0: }
sl@0: 
sl@0: EXPORT_C TBool NKern::Crashed()
sl@0: 	{
sl@0: 	return CrashState!=0;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: /** @internalTechnology */
sl@0: EXPORT_C void NKern::RecordIntLatency(TInt /*aLatency*/, TInt /*aIntMask*/)
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: 
sl@0: /** @internalTechnology */
sl@0: EXPORT_C void NKern::RecordThreadLatency(TInt /*aLatency*/)
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: /********************************************
sl@0:  * Deterministic Priority List Implementation
sl@0:  ********************************************/
sl@0: 
sl@0: 
sl@0: /** Construct a priority list with the specified number of priorities
sl@0: 
sl@0: 	@param aNumPriorities The number of priorities (must be 1-64).
sl@0:  */
sl@0: EXPORT_C TPriListBase::TPriListBase(TInt aNumPriorities)
sl@0: 	{
sl@0: 	memclr(this, sizeof(TPriListBase)+(aNumPriorities-1)*sizeof(SDblQueLink*) );
sl@0: 	}
sl@0: 
sl@0: 
sl@0: /********************************************
sl@0:  * Miscellaneous
sl@0:  ********************************************/
sl@0: 
sl@0: 
sl@0: /**	Returns number of nanokernel timer ticks since system started.
sl@0: 	@return tick count
sl@0: 	@pre any context
sl@0:  */
sl@0: EXPORT_C TUint32 NKern::TickCount()
sl@0: 	{
sl@0: 	return NTickCount();
sl@0: 	}
sl@0: 
sl@0: 
sl@0: TUint32 BTrace::BigTraceId = 0;
sl@0: 
sl@0: TBool BTrace::DoOutBig(TUint32 a0, TUint32 a1, const TAny* aData, TInt aDataSize, TUint32 aContext, TUint32 aPc)
sl@0: 	{
sl@0: 	SBTraceData& traceData = BTraceData;
sl@0: 
sl@0: 	// see if trace is small enough to fit in single record...
sl@0: 	if(TUint(aDataSize)<=TUint(KMaxBTraceDataArray+4))
sl@0: 		{
sl@0: 		a0 += aDataSize;
sl@0: 		TUint32 a2 = 0;
sl@0: 		TUint32 a3 = 0;
sl@0: 		if(aDataSize)
sl@0: 			{
sl@0: 			a2 = *((TUint32*&)aData)++; // first 4 bytes into a2
sl@0: 			if(aDataSize>=4 && aDataSize<=8)
sl@0: 				a3 = *(TUint32*)aData; // only 4 more bytes, so pass by value, not pointer
sl@0: 			else
sl@0: 				a3 = (TUint32)aData;
sl@0: 			}
sl@0: 		return traceData.iHandler(a0,0,aContext,a1,a2,a3,0,aPc);
sl@0: 		}
sl@0: 
sl@0: 	// adjust for header2, extra, and size word...
sl@0: 	a0 |= BTrace::EHeader2Present<<(BTrace::EFlagsIndex*8)|BTrace::EExtraPresent<<(BTrace::EFlagsIndex*8);
sl@0: 	a0 += 12;
sl@0: 
sl@0: 	TUint32 traceId = __e32_atomic_add_ord32(&BigTraceId, 1);
sl@0: 	TUint32 header2 = BTrace::EMultipartFirst;
sl@0: 	TInt offset = 0;
sl@0: 	do
sl@0: 		{
sl@0: 		TUint32 size = aDataSize-offset;
sl@0: 		if(size>KMaxBTraceDataArray)
sl@0: 			size = KMaxBTraceDataArray;
sl@0: 		else
sl@0: 			header2 = BTrace::EMultipartLast;
sl@0: 		if(size<=4)
sl@0: 			*(TUint32*)&aData = *(TUint32*)aData; // 4 bytes or less are passed by value, not pointer
sl@0: 
sl@0: 		TBool result = traceData.iHandler(a0+size,header2,aContext,aDataSize,a1,(TUint32)aData,traceId,aPc);
sl@0: 		if(!result)
sl@0: 			return result;
sl@0: 
sl@0: 		offset += size;
sl@0: 		*(TUint8**)&aData += size;
sl@0: 
sl@0: 		header2 = BTrace::EMultipartMiddle;
sl@0: 		a1 = offset;
sl@0: 		}
sl@0: 	while(offset<aDataSize);
sl@0: 
sl@0: 	return TRUE;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C TSpinLock* BTrace::LockPtr()
sl@0: 	{
sl@0: 	return 0;
sl@0: 	}