stk::test::condvar::StressTestTask< _AccessMode > Class Template Reference

Stress test of ConditionVariable under full five-task contention. More...

Inheritance diagram for stk::test::condvar::StressTestTask< _AccessMode >:

Collaboration diagram for stk::test::condvar::StressTestTask< _AccessMode >:

Public Types
enum

Public Member Functions
	StressTestTask (uint8_t task_id, int32_t iterations)
Word *	GetStack () const
	Get pointer to the stack memory.
size_t	GetStackSize () const
	Get number of elements of the stack memory array.
size_t	GetStackSizeBytes () const
	Get size of the memory in bytes.
EAccessMode	GetAccessMode () const
	Get hardware access mode of the user task.
virtual void	OnDeadlineMissed (uint32_t duration)
	Default no-op handler. Override in subclass to log or handle missed deadlines.
virtual int32_t	GetWeight () const
	Default weight of 1. Override in subclass if custom scheduling weight is needed.
virtual TId	GetId () const
	Get object's own address as its Id. Unique per task instance, requires no manual assignment.
virtual const char *	GetTraceName () const
	Override in subclass to supply a name for SEGGER SystemView tracing. Returns NULL by default.

Private Member Functions
void	Run ()
	Entry point of the user task.

Private Attributes
uint8_t	m_task_id
int32_t	m_iterations
StackMemoryDef< _StackSize >::Type	m_stack
	Stack memory region, 16-byte aligned.

Detailed Description

template<EAccessMode _AccessMode>
class stk::test::condvar::StressTestTask< _AccessMode >

Stress test of ConditionVariable under full five-task contention.

Note

Each task alternates producer and consumer roles each iteration. Odd iterations: acquire mutex, increment shared data, NotifyOne(), release. Even iterations: acquire mutex, Wait() until notified, release. The total number of successful wakes across all tasks must reach the guaranteed minimum (number of producer iterations across all tasks).

Definition at line 509 of file test_condvar.cpp.

Member Enumeration Documentation

anonymous enum

anonymous enum

inherited

Definition at line 52 of file stk_helper.h.

{ STACK_SIZE = _StackSize }; 

Constructor & Destructor Documentation

StressTestTask()

template<EAccessMode _AccessMode>

stk::test::condvar::StressTestTask< _AccessMode >::StressTestTask ( uint8_t task_id, int32_t iterations )

inline

Definition at line 515 of file test_condvar.cpp.

                                                        : m_task_id(task_id), m_iterations(iterations)
    {}

References m_iterations, and m_task_id.

Member Function Documentation

GetAccessMode()

EAccessMode stk::Task< _StackSize, _AccessMode >::GetAccessMode ( ) const

inlinevirtualinherited

Get hardware access mode of the user task.

Implements stk::ITask.

Definition at line 57 of file stk_helper.h.

{ return _AccessMode; }

GetId()

virtual TId stk::Task< _StackSize, _AccessMode >::GetId ( ) const

inlinevirtualinherited

Get object's own address as its Id. Unique per task instance, requires no manual assignment.

Implements stk::ITask.

Definition at line 72 of file stk_helper.h.

{ return hw::PtrToWord(this); }

GetStack()

Word * stk::Task< _StackSize, _AccessMode >::GetStack ( ) const

inlinevirtualinherited

Get pointer to the stack memory.

Implements stk::IStackMemory.

Definition at line 54 of file stk_helper.h.

{ return const_cast<Word *>(m_stack); }

GetStackSize()

size_t stk::Task< _StackSize, _AccessMode >::GetStackSize ( ) const

inlinevirtualinherited

Get number of elements of the stack memory array.

Implements stk::IStackMemory.

Definition at line 55 of file stk_helper.h.

{ return _StackSize; }

GetStackSizeBytes()

size_t stk::Task< _StackSize, _AccessMode >::GetStackSizeBytes ( ) const

inlinevirtualinherited

Get size of the memory in bytes.

Implements stk::IStackMemory.

Definition at line 56 of file stk_helper.h.

{ return _StackSize * sizeof(Word); }

GetTraceName()

virtual const char * stk::Task< _StackSize, _AccessMode >::GetTraceName ( ) const

inlinevirtualinherited

Override in subclass to supply a name for SEGGER SystemView tracing. Returns NULL by default.

Implements stk::ITask.

Definition at line 76 of file stk_helper.h.

{ return nullptr; }

GetWeight()

virtual int32_t stk::Task< _StackSize, _AccessMode >::GetWeight ( ) const

inlinevirtualinherited

Default weight of 1. Override in subclass if custom scheduling weight is needed.

Note

Only relevant when using SwitchStrategySmoothWeightedRoundRobin. Prefer TaskW for compile-time weight assignment.

Implements stk::ITask.

Definition at line 68 of file stk_helper.h.

{ return 1; }

OnDeadlineMissed()

virtual void stk::Task< _StackSize, _AccessMode >::OnDeadlineMissed ( uint32_t duration )

inlinevirtualinherited

Default no-op handler. Override in subclass to log or handle missed deadlines.

Note

HRT deadline misses are only possible when the kernel is started with KERNEL_HRT.

Implements stk::ITask.

Definition at line 62 of file stk_helper.h.

{ (void)duration; }

Run()

template<EAccessMode _AccessMode>

void stk::test::condvar::StressTestTask< _AccessMode >::Run ( )

inlineprivatevirtual

Entry point of the user task.

Note

Called by the Kernel when the task is scheduled for execution. Implement this method with the task's main logic.

Warning

If Kernel is configured as KERNEL_STATIC, the body must contain an infinite loop.

void Run()
{
    while (true)
    {
        // task logic here
    }
}

Implements stk::ITask.

Definition at line 519 of file test_condvar.cpp.

    {
        for (int32_t i = 0; i < m_iterations; ++i)
        {
            if ((i % 2) == 0)
            {
                // Producer role: signal one waiter
                g_TestMutex.Lock();
                ++g_SharedCounter;
                g_TestCond.NotifyOne();
                g_TestMutex.Unlock();
            }
            else
            {
                // Consumer role: wait for a signal (may fail under contention if no producer fires)
                g_TestMutex.Lock();
                g_TestCond.Wait(g_TestMutex, _STK_CV_TEST_SHORT_SLEEP);
                g_TestMutex.Unlock();
            }
        }
 
        ++g_InstancesDone;
 
        if (m_task_id == (_STK_CV_TEST_TASKS_MAX - 1))
        {
            while (g_InstancesDone < _STK_CV_TEST_TASKS_MAX)
                stk::Sleep(_STK_CV_TEST_LONG_SLEEP);
 
            // Minimum guaranteed: producer iterations only (m_iterations / 2 per task,
            // rounded up since even index 0 is always a producer iteration)
            int32_t min_expected = _STK_CV_TEST_TASKS_MAX * ((m_iterations + 1) / 2);
 
            printf("stress test: counter=%d (min expected %d)\n",
                (int)g_SharedCounter, (int)min_expected);
 
            if (g_SharedCounter >= min_expected)
                g_TestResult = 1;
        }
    }

References _STK_CV_TEST_LONG_SLEEP, _STK_CV_TEST_SHORT_SLEEP, _STK_CV_TEST_TASKS_MAX, stk::test::condvar::g_InstancesDone, stk::test::condvar::g_SharedCounter, stk::test::condvar::g_TestCond, stk::test::condvar::g_TestMutex, stk::test::condvar::g_TestResult, m_iterations, m_task_id, and stk::Sleep().

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Member Data Documentation

m_iterations

template<EAccessMode _AccessMode>

int32_t stk::test::condvar::StressTestTask< _AccessMode >::m_iterations

private

Definition at line 512 of file test_condvar.cpp.

Referenced by Run(), and StressTestTask().

m_stack

StackMemoryDef<_StackSize>::Type stk::Task< _StackSize, _AccessMode >::m_stack

privateinherited

Stack memory region, 16-byte aligned.

Definition at line 98 of file stk_helper.h.

m_task_id

template<EAccessMode _AccessMode>

uint8_t stk::test::condvar::StressTestTask< _AccessMode >::m_task_id

private

Definition at line 511 of file test_condvar.cpp.

Referenced by Run(), and StressTestTask().

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The documentation for this class was generated from the following file:

• test_condvar.cpp