PERSONALITY LAYERS in .NET

Drawing QR-Code in .NET PERSONALITY LAYERS
PERSONALITY LAYERS
Scan Quick Response Code In Visual Studio .NET
Using Barcode Control SDK for Visual Studio .NET Control to generate, create, read, scan barcode image in .NET framework applications.
The code to signal a semaphore is complicated by the fact that the API must work whether it was called from a thread or an ISR:
QR-Code Generator In .NET Framework
Using Barcode creation for Visual Studio .NET Control to generate, create QR Code ISO/IEC18004 image in Visual Studio .NET applications.
extern "C" int semaphore_signal(int sem_id) { if (TUint(sem_id) >= TUint(PSemaphore::NumSemaphores)) return BAD_SEM_ID; PSemaphore* s = PSemaphore::SemaphoreTable + sem_id; TInt c = NKern::CurrentContext(); if (c == NKern::EInterrupt) { s->ISRSignal(); return OK; } NKern::Lock(); s->Signal(); NKern::Unlock(); return OK; } void PSemaphore::Signal() { if (++iCount <= 0) { // must wake up next thread PThread* t = iWaitQ.First(); iWaitQ.Remove(t); t->Release(KErrNone); } } void PSemaphore::ISRSignal() { if (NKern::LockedInc(iISRCount)==0) iIDfc.Add(); } void PSemaphore::IDfcFn(TAny* aPtr) { PSemaphore* s = (PSemaphore*)aPtr; TInt count; count = (TInt)NKern::SafeSwap(0, (TAny*&)s->iISRCount); while (count--) s->Signal(); }
Denso QR Bar Code Decoder In Visual Studio .NET
Using Barcode decoder for VS .NET Control to read, scan read, scan image in .NET framework applications.
Again we declare the public API with C linkage. The function begins by validating the semaphore ID argument and looking up the PSemaphore object from the ID. Then it checks the current execution context. If it was called from within an ISR, it calls ISRSignal(), otherwise it calls Signal() with preemption disabled. Signal() increments the semaphore s count; if the count was originally negative, it takes the rst thread off the wait queue (which is priority ordered, so it gets the highest priority waiting thread) and releases it.
Generating Bar Code In .NET Framework
Using Barcode drawer for Visual Studio .NET Control to generate, create bar code image in .NET applications.
REAL TIME
Decoding Barcode In Visual Studio .NET
Using Barcode recognizer for .NET Control to read, scan read, scan image in .NET framework applications.
Note that the wait queue cannot be empty since a semaphore count of N implies that there are N threads on the wait queue. If the semaphore is signaled from an ISR, we can t wake up the rst waiting thread immediately, since neither the semaphore wait queue nor the thread ready list is guaranteed to be consistent during ISRs. Instead, we atomically increment the iISRCount eld. If iISRCount was initially zero the semaphore s IDFC is queued. The IDFC atomically reads iISRCount and zeros it again, then signals the semaphore the required number of times. Finally, let s examine the state handler used for personality layer threads, and its associated methods.
Encoding QR Code 2d Barcode In C#.NET
Using Barcode drawer for .NET Control to generate, create QR Code 2d barcode image in .NET framework applications.
void PThread::StateHandler(NThread* aThread, TInt aOp, TInt aParam) { PThread* t = (PThread*)aThread; switch (aOp) { case NThreadBase::ESuspend: t->HandleSuspend(); break; case NThreadBase::EResume: case NThreadBase::EForceResume: t->HandleResume(); break; case NThreadBase::ERelease: t->HandleRelease(aParam); break; case NThreadBase::EChangePriority: t->HandlePriorityChange(aParam); break; case NThreadBase::ETimeout: t->HandleTimeout(); break; case NThreadBase::ELeaveCS: default: __NK_ASSERT_ALWAYS(0); } } void PThread::HandleSuspend() { switch(iNState) { case EWaitSemaphore: ((PSemaphore*)iWaitObj)->SuspendWaitingThread(this); break; default: __NK_ASSERT_ALWAYS(0); } } void PThread::HandleResume() { switch(iNState)
QR Code Generation In .NET
Using Barcode generator for ASP.NET Control to generate, create QR Code JIS X 0510 image in ASP.NET applications.
PERSONALITY LAYERS
Making QR Code ISO/IEC18004 In VB.NET
Using Barcode printer for VS .NET Control to generate, create QR image in Visual Studio .NET applications.
{ case EWaitSemaphore: ((PSemaphore*)iWaitObj)->ResumeWaitingThread(this); break; default: __NK_ASSERT_ALWAYS(0); } } void PThread::HandleRelease(TInt aReturnCode) { switch(iNState) { case EWaitSemaphore: if (aReturnCode<0) ((PSemaphore*)iWaitObj)->WaitCancel(this); else CheckSuspendThenReady(); break; default: __NK_ASSERT_ALWAYS(0); } } void PThread::HandlePriorityChange(TInt aNewPriority) { switch(iNState) { case EWaitSemaphore: ((PSemaphore*)iWaitObj)->ChangeWaitingThreadPriority(this, aNewPriority); break; default: __NK_ASSERT_ALWAYS(0); } } void PThread::HandleTimeout() { switch(iNState) { case EWaitSemaphore: ((PSemaphore*)iWaitObj)->WaitCancel(this); break; default: __NK_ASSERT_ALWAYS(0); } } void PSemaphore::WaitCancel(PThread* aThread) { if (aThread->iSuspendCount == 0) { iWaitQ.Remove(aThread); ++iCount; } else aThread->Deque();
Generating GTIN - 13 In .NET
Using Barcode printer for .NET framework Control to generate, create European Article Number 13 image in .NET applications.
REAL TIME
Paint UPC-A Supplement 2 In Visual Studio .NET
Using Barcode printer for .NET Control to generate, create GTIN - 12 image in VS .NET applications.
aThread->CheckSuspendThenReady(); } void PSemaphore::SuspendWaitingThread(PThread* aThread) { // do nothing if already suspended if (aThread->iSuspendCount == 0) { iWaitQ.Remove(aThread); ++iCount; iSuspendedQ.Add(aThread); } } void PSemaphore::ResumeWaitingThread(PThread* aThread) { aThread->Deque(); if (--iCount<0) iWaitQ.Add(aThread); else { aThread->iWaitObj=NULL; aThread->Ready(); } } void PSemaphore::ChangeWaitingThreadPriority(PThread* aThread, TInt aNewPriority) { if (aThread->iSuspendCount == 0) iWaitQ.ChangePriority(aThread, aNewPriority); else aThread->iPriority = (TUint8)aNewPriority; }
Generating Bar Code In Visual Studio .NET
Using Barcode generation for VS .NET Control to generate, create bar code image in VS .NET applications.
The state handler calls different PThread methods according to which operation is being performed on the thread. Each of these PThread methods then performs the appropriate operation on the object on which the thread is waiting, depending on the N-state. If a thread is suspended while waiting on a semaphore, the code rst checks the thread s suspend count. The suspend count is zero if the thread is not suspended and N if it has been suspended N times. If the thread was already suspended, no action is required. Otherwise we move the thread from the semaphore s wait queue to its suspended queue. We then increment the semaphore count to preserve the invariant that (if negative) it equals minus the number of threads on the wait queue. If a thread is resumed while waiting on a semaphore, we remove it from the semaphore s suspended queue, where it was placed when it was rst suspended. Then we decrement the semaphore s count, balancing the increment when the thread was suspended. If the count becomes negative, we add the thread to the semaphore s wait queue and it remains in the PThread::EWaitSemaphore state. If the count
Draw Code11 In .NET Framework
Using Barcode maker for Visual Studio .NET Control to generate, create Code 11 image in .NET applications.
UPC-A Printer In Visual C#.NET
Using Barcode creator for .NET framework Control to generate, create UPCA image in VS .NET applications.
Encode Code-39 In .NET Framework
Using Barcode creation for ASP.NET Control to generate, create Code 3 of 9 image in ASP.NET applications.
Code 128C Creation In VS .NET
Using Barcode generator for ASP.NET Control to generate, create USS Code 128 image in ASP.NET applications.
Barcode Encoder In Java
Using Barcode printer for Java Control to generate, create bar code image in Java applications.