semtest.h File Reference

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Functions
void	vStartSemaphoreTasks (unsigned portBASE_TYPE uxPriority)
portBASE_TYPE	xAreSemaphoreTasksStillRunning (void)

---

Function Documentation

void vStartSemaphoreTasks

(

unsigned portBASE_TYPE

uxPriority

)

Definition at line 115 of file semtest.c.

References portTICK_RATE_MS, SEMAPHORE_PARAMETERS::pulSharedVariable, pvPortMalloc(), semtstBLOCKING_EXPECTED_VALUE, semtstNON_BLOCKING_EXPECTED_VALUE, semtstSTACK_SIZE, tskIDLE_PRIORITY, vQueueAddToRegistry, vSemaphoreCreateBinary, SEMAPHORE_PARAMETERS::xBlockTime, SEMAPHORE_PARAMETERS::xSemaphore, and xTaskCreate.

Referenced by main().

{
xSemaphoreParameters *pxFirstSemaphoreParameters, *pxSecondSemaphoreParameters;
const portTickType xBlockTime = ( portTickType ) 100;

    /* Create the structure used to pass parameters to the first two tasks. */
    pxFirstSemaphoreParameters = ( xSemaphoreParameters * ) pvPortMalloc( sizeof( xSemaphoreParameters ) );

    if( pxFirstSemaphoreParameters != NULL )
    {
        /* Create the semaphore used by the first two tasks. */
        vSemaphoreCreateBinary( pxFirstSemaphoreParameters->xSemaphore );

        if( pxFirstSemaphoreParameters->xSemaphore != NULL )
        {
            /* Create the variable which is to be shared by the first two tasks. */
            pxFirstSemaphoreParameters->pulSharedVariable = ( unsigned long * ) pvPortMalloc( sizeof( unsigned long ) );

            /* Initialise the share variable to the value the tasks expect. */
            *( pxFirstSemaphoreParameters->pulSharedVariable ) = semtstNON_BLOCKING_EXPECTED_VALUE;

            /* The first two tasks do not block on semaphore calls. */
            pxFirstSemaphoreParameters->xBlockTime = ( portTickType ) 0;

            /* Spawn the first two tasks.  As they poll they operate at the idle priority. */
            xTaskCreate( prvSemaphoreTest, ( signed char * ) "PolSEM1", semtstSTACK_SIZE, ( void * ) pxFirstSemaphoreParameters, tskIDLE_PRIORITY, ( xTaskHandle * ) NULL );
            xTaskCreate( prvSemaphoreTest, ( signed char * ) "PolSEM2", semtstSTACK_SIZE, ( void * ) pxFirstSemaphoreParameters, tskIDLE_PRIORITY, ( xTaskHandle * ) NULL );
        }
    }

    /* Do exactly the same to create the second set of tasks, only this time 
    provide a block time for the semaphore calls. */
    pxSecondSemaphoreParameters = ( xSemaphoreParameters * ) pvPortMalloc( sizeof( xSemaphoreParameters ) );
    if( pxSecondSemaphoreParameters != NULL )
    {
        vSemaphoreCreateBinary( pxSecondSemaphoreParameters->xSemaphore );

        if( pxSecondSemaphoreParameters->xSemaphore != NULL )
        {
            pxSecondSemaphoreParameters->pulSharedVariable = ( unsigned long * ) pvPortMalloc( sizeof( unsigned long ) );
            *( pxSecondSemaphoreParameters->pulSharedVariable ) = semtstBLOCKING_EXPECTED_VALUE;
            pxSecondSemaphoreParameters->xBlockTime = xBlockTime / portTICK_RATE_MS;

            xTaskCreate( prvSemaphoreTest, ( signed char * ) "BlkSEM1", semtstSTACK_SIZE, ( void * ) pxSecondSemaphoreParameters, uxPriority, ( xTaskHandle * ) NULL );
            xTaskCreate( prvSemaphoreTest, ( signed char * ) "BlkSEM2", semtstSTACK_SIZE, ( void * ) pxSecondSemaphoreParameters, uxPriority, ( xTaskHandle * ) NULL );
        }
    }

    /* vQueueAddToRegistry() adds the semaphore to the registry, if one is
    in use.  The registry is provided as a means for kernel aware 
    debuggers to locate semaphores and has no purpose if a kernel aware debugger
    is not being used.  The call to vQueueAddToRegistry() will be removed
    by the pre-processor if configQUEUE_REGISTRY_SIZE is not defined or is 
    defined to be less than 1. */
    vQueueAddToRegistry( ( xQueueHandle ) pxFirstSemaphoreParameters->xSemaphore, ( signed char * ) "Counting_Sem_1" );
    vQueueAddToRegistry( ( xQueueHandle ) pxSecondSemaphoreParameters->xSemaphore, ( signed char * ) "Counting_Sem_2" );
}

portBASE_TYPE xAreSemaphoreTasksStillRunning

(

void

)

Definition at line 266 of file semtest.c.

References pdFALSE, pdTRUE, portBASE_TYPE, sCheckVariables, and semtstNUM_TASKS.

Referenced by prvCheckOtherTasksAreStillRunning().

{
static short sLastCheckVariables[ semtstNUM_TASKS ] = { 0 };
portBASE_TYPE xTask, xReturn = pdTRUE;

    for( xTask = 0; xTask < semtstNUM_TASKS; xTask++ )
    {
        if( sLastCheckVariables[ xTask ] == sCheckVariables[ xTask ] )
        {
            xReturn = pdFALSE;
        }

        sLastCheckVariables[ xTask ] = sCheckVariables[ xTask ];
    }

    return xReturn;
}