static void vErrorChecks( void *pvParameters )
{
TickType_t xExpectedWakeTime;
const TickType_t xPrintRate = ( TickType_t ) 5000 / portTICK_PERIOD_MS;
const long lMaxAllowableTimeDifference = ( long ) 0;
TickType_t xWakeTime;
long lTimeDifference;
const char *pcReceivedMessage;
const char * const pcTaskBlockedTooLongMsg = "Print task blocked too long!\r\n";
const char * const pcUnexpectedHookValueMsg = "Task hook has unexpected value!\r\n";
( void ) pvParameters;
/* Register our callback function. */
vTaskSetApplicationTaskTag( NULL, prvExampleTaskHook );
/* Just for test purposes. */
if( xTaskGetApplicationTaskTag( NULL ) != prvExampleTaskHook )
{
vPrintDisplayMessage( &pcUnexpectedHookValueMsg );
}
/* Loop continuously, blocking, then checking all the other tasks are still
running, before blocking once again. This task blocks on the queue of
messages that require displaying so will wake either by its time out expiring,
or a message becoming available. */
for( ;; )
{
/* Calculate the time we will unblock if no messages are received
on the queue. This is used to check that we have not blocked for too long. */
xExpectedWakeTime = xTaskGetTickCount();
xExpectedWakeTime += xPrintRate;
/* Block waiting for either a time out or a message to be posted that
required displaying. */
pcReceivedMessage = pcPrintGetNextMessage( xPrintRate );
/* Was a message received? */
if( pcReceivedMessage == NULL )
{
/* A message was not received so we timed out, did we unblock at the
expected time? */
xWakeTime = xTaskGetTickCount();
/* Calculate the difference between the time we unblocked and the
time we should have unblocked. */
if( xWakeTime > xExpectedWakeTime )
{
lTimeDifference = ( long ) ( xWakeTime - xExpectedWakeTime );
}
else
{
lTimeDifference = ( long ) ( xExpectedWakeTime - xWakeTime );
}
if( lTimeDifference > lMaxAllowableTimeDifference )
{
/* We blocked too long - create a message that will get
printed out the next time around. If we are not using
preemption then we won't expect the timing to be so
accurate. */
if( sUsingPreemption == pdTRUE )
{
vPrintDisplayMessage( &pcTaskBlockedTooLongMsg );
}
}
/* Check the other tasks are still running, just in case. */
prvCheckOtherTasksAreStillRunning();
}
else
{
/* We unblocked due to a message becoming available. Send the message
for printing. */
vDisplayMessage( pcReceivedMessage );
}
/* Key presses are used to invoke the trace visualisation utility, or end
the program. */
prvCheckForKeyPresses();
}
}
static void vErrorChecks( void *pvParameters )
{
portTickType xExpectedWakeTime;
const portTickType xPrintRate = ( portTickType ) 5000 / portTICK_RATE_MS;
const portLONG lMaxAllowableTimeDifference = ( portLONG ) 0;
portTickType xWakeTime;
portLONG lTimeDifference;
const portCHAR *pcReceivedMessage;
const portCHAR * const pcTaskBlockedTooLongMsg = "Print task blocked too long!\r\n";
/* Stop warnings. */
( void ) pvParameters;
/* Loop continuously, blocking, then checking all the other tasks are still
running, before blocking once again. This task blocks on the queue of messages
that require displaying so will wake either by its time out expiring, or a
message becoming available. */
for( ;; )
{
/* Calculate the time we will unblock if no messages are received
on the queue. This is used to check that we have not blocked for too long. */
xExpectedWakeTime = xTaskGetTickCount();
xExpectedWakeTime += xPrintRate;
/* Block waiting for either a time out or a message to be posted that
required displaying. */
pcReceivedMessage = pcPrintGetNextMessage( xPrintRate );
/* Was a message received? */
if( pcReceivedMessage == NULL )
{
/* A message was not received so we timed out, did we unblock at the
expected time? */
xWakeTime = xTaskGetTickCount();
/* Calculate the difference between the time we unblocked and the
time we should have unblocked. */
if( xWakeTime > xExpectedWakeTime )
{
lTimeDifference = ( portLONG ) ( xWakeTime - xExpectedWakeTime );
}
else
{
lTimeDifference = ( portLONG ) ( xExpectedWakeTime - xWakeTime );
}
if( lTimeDifference > lMaxAllowableTimeDifference )
{
/* We blocked too long - create a message that will get
printed out the next time around. */
vPrintDisplayMessage( &pcTaskBlockedTooLongMsg );
}
/* Check the other tasks are still running, just in case. */
prvCheckOtherTasksAreStillRunning();
}
else
{
/* We unblocked due to a message becoming available. Send the message
for printing. */
vDisplayMessage( pcReceivedMessage );
}
/* Key presses are used to invoke the trace visualisation utility, or
end the program. */
prvCheckForKeyPresses();
}
} /*lint !e715 !e818 pvParameters is not used but all task functions must take this form. */
