/*
    FreeRTOS V8.0.0 - Copyright (C) 2014 Real Time Engineers Ltd. 
    All rights reserved

    VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

    ***************************************************************************
     *                                                                       *
     *    FreeRTOS provides completely free yet professionally developed,    *
     *    robust, strictly quality controlled, supported, and cross          *
     *    platform software that has become a de facto standard.             *
     *                                                                       *
     *    Help yourself get started quickly and support the FreeRTOS         *
     *    project by purchasing a FreeRTOS tutorial book, reference          *
     *    manual, or both from: http://www.FreeRTOS.org/Documentation        *
     *                                                                       *
     *    Thank you!                                                         *
     *                                                                       *
    ***************************************************************************

    This file is part of the FreeRTOS distribution.

    FreeRTOS is free software; you can redistribute it and/or modify it under
    the terms of the GNU General Public License (version 2) as published by the
    Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.

    >>! NOTE: The modification to the GPL is included to allow you to distribute
    >>! a combined work that includes FreeRTOS without being obliged to provide
    >>! the source code for proprietary components outside of the FreeRTOS
    >>! kernel.

    FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
    FOR A PARTICULAR PURPOSE.  Full license text is available from the following
    link: http://www.freertos.org/a00114.html

    1 tab == 4 spaces!

    ***************************************************************************
     *                                                                       *
     *    Having a problem?  Start by reading the FAQ "My application does   *
     *    not run, what could be wrong?"                                     *
     *                                                                       *
     *    http://www.FreeRTOS.org/FAQHelp.html                               *
     *                                                                       *
    ***************************************************************************

    http://www.FreeRTOS.org - Documentation, books, training, latest versions,
    license and Real Time Engineers Ltd. contact details.

    http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
    including FreeRTOS+Trace - an indispensable productivity tool, a DOS
    compatible FAT file system, and our tiny thread aware UDP/IP stack.

    http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
    Integrity Systems to sell under the OpenRTOS brand.  Low cost OpenRTOS
    licenses offer ticketed support, indemnification and middleware.

    http://www.SafeRTOS.com - High Integrity Systems also provide a safety
    engineered and independently SIL3 certified version for use in safety and
    mission critical applications that require provable dependability.

    1 tab == 4 spaces!
*/

/*
 * This is a version of BlockTim.c that uses the light weight API.
 *
 * This file contains some test scenarios that ensure tasks do not exit queue
 * send or receive functions prematurely.  A description of the tests is
 * included within the code.
 */

/* Kernel includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"

/* Demo includes. */
#include "AltBlock.h"

/* Task priorities. */
#define bktPRIMARY_PRIORITY			( 3 )
#define bktSECONDARY_PRIORITY		( 2 )

/* Task behaviour. */
#define bktQUEUE_LENGTH				( 5 )
#define bktSHORT_WAIT				( ( ( TickType_t ) 20 ) / portTICK_PERIOD_MS )
#define bktPRIMARY_BLOCK_TIME		( 10 )
#define bktALLOWABLE_MARGIN			( 12 )
#define bktTIME_TO_BLOCK			( 175 )
#define bktDONT_BLOCK				( ( TickType_t ) 0 )
#define bktRUN_INDICATOR			( ( unsigned portBASE_TYPE ) 0x55 )

/* The queue on which the tasks block. */
static QueueHandle_t xTestQueue;

/* Handle to the secondary task is required by the primary task for calls
to vTaskSuspend/Resume(). */
static TaskHandle_t xSecondary;

/* Used to ensure that tasks are still executing without error. */
static portBASE_TYPE xPrimaryCycles = 0, xSecondaryCycles = 0;
static portBASE_TYPE xErrorOccurred = pdFALSE;

/* Provides a simple mechanism for the primary task to know when the
secondary task has executed. */
static volatile unsigned portBASE_TYPE xRunIndicator;

/* The two test tasks.  Their behaviour is commented within the files. */
static void vPrimaryBlockTimeTestTask( void *pvParameters );
static void vSecondaryBlockTimeTestTask( void *pvParameters );

/*-----------------------------------------------------------*/

void vCreateAltBlockTimeTasks( void )
{
	/* Create the queue on which the two tasks block. */
    xTestQueue = xQueueCreate( bktQUEUE_LENGTH, sizeof( portBASE_TYPE ) );

	/* vQueueAddToRegistry() adds the queue to the queue registry, if one is
	in use.  The queue registry is provided as a means for kernel aware 
	debuggers to locate queues 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( xTestQueue, "AltBlockQueue" );


	/* Create the two test tasks. */
	xTaskCreate( vPrimaryBlockTimeTestTask, "FBTest1", configMINIMAL_STACK_SIZE, NULL, bktPRIMARY_PRIORITY, NULL );
	xTaskCreate( vSecondaryBlockTimeTestTask, "FBTest2", configMINIMAL_STACK_SIZE, NULL, bktSECONDARY_PRIORITY, &xSecondary );
}
/*-----------------------------------------------------------*/

static void vPrimaryBlockTimeTestTask( void *pvParameters )
{
portBASE_TYPE xItem, xData;
TickType_t xTimeWhenBlocking;
TickType_t xTimeToBlock, xBlockedTime;

	#ifdef USE_STDIO
	void vPrintDisplayMessage( const char * const * ppcMessageToSend );
	
		const char * const pcTaskStartMsg = "Alt primary block time test started.\r\n";

		/* Queue a message for printing to say the task has started. */
		vPrintDisplayMessage( &pcTaskStartMsg );
	#endif

	( void ) pvParameters;

	for( ;; )
	{
		/*********************************************************************
        Test 1

        Simple block time wakeup test on queue receives. */
		for( xItem = 0; xItem < bktQUEUE_LENGTH; xItem++ )
		{
			/* The queue is empty. Attempt to read from the queue using a block
			time.  When we wake, ensure the delta in time is as expected. */
			xTimeToBlock = bktPRIMARY_BLOCK_TIME << xItem;

			/* A critical section is used to minimise the jitter in the time
			measurements. */
			portENTER_CRITICAL();
			{
				xTimeWhenBlocking = xTaskGetTickCount();
				
				/* We should unblock after xTimeToBlock having not received
				anything on the queue. */
				if( xQueueAltReceive( xTestQueue, &xData, xTimeToBlock ) != errQUEUE_EMPTY )
				{
					xErrorOccurred = pdTRUE;
				}

				/* How long were we blocked for? */
				xBlockedTime = xTaskGetTickCount() - xTimeWhenBlocking;
			}
			portEXIT_CRITICAL();

			if( xBlockedTime < xTimeToBlock )
			{
				/* Should not have blocked for less than we requested. */
				xErrorOccurred = pdTRUE;
			}

			if( xBlockedTime > ( xTimeToBlock + bktALLOWABLE_MARGIN ) )
			{
				/* Should not have blocked for longer than we requested,
				although we would not necessarily run as soon as we were
				unblocked so a margin is allowed. */
				xErrorOccurred = pdTRUE;
			}
		}


		#if configUSE_PREEMPTION == 0
			taskYIELD();
		#endif


		/*********************************************************************
        Test 2

        Simple block time wakeup test on queue sends.

		First fill the queue.  It should be empty so all sends should pass. */
		for( xItem = 0; xItem < bktQUEUE_LENGTH; xItem++ )
		{
			if( xQueueAltSendToBack( xTestQueue, &xItem, bktDONT_BLOCK ) != pdPASS )
			{
				xErrorOccurred = pdTRUE;
			}
		}

		for( xItem = 0; xItem < bktQUEUE_LENGTH; xItem++ )
		{
			/* The queue is full. Attempt to write to the queue using a block
			time.  When we wake, ensure the delta in time is as expected. */
			xTimeToBlock = bktPRIMARY_BLOCK_TIME << xItem;

			portENTER_CRITICAL();
			{
				xTimeWhenBlocking = xTaskGetTickCount();
				
				/* We should unblock after xTimeToBlock having not received
				anything on the queue. */
				if( xQueueAltSendToBack( xTestQueue, &xItem, xTimeToBlock ) != errQUEUE_FULL )
				{
					xErrorOccurred = pdTRUE;
				}

				/* How long were we blocked for? */
				xBlockedTime = xTaskGetTickCount() - xTimeWhenBlocking;
			}
			portEXIT_CRITICAL();

			if( xBlockedTime < xTimeToBlock )
			{
				/* Should not have blocked for less than we requested. */
				xErrorOccurred = pdTRUE;
			}

			if( xBlockedTime > ( xTimeToBlock + bktALLOWABLE_MARGIN ) )
			{
				/* Should not have blocked for longer than we requested,
				although we would not necessarily run as soon as we were
				unblocked so a margin is allowed. */
				xErrorOccurred = pdTRUE;
			}
		}

		#if configUSE_PREEMPTION == 0
			taskYIELD();
		#endif

		
		/*********************************************************************
        Test 3

		Wake the other task, it will block attempting to post to the queue.
		When we read from the queue the other task will wake, but before it
		can run we will post to the queue again.  When the other task runs it
		will find the queue still full, even though it was woken.  It should
		recognise that its block time has not expired and return to block for
		the remains of its block time.

		Wake the other task so it blocks attempting to post to the already
		full queue. */
		xRunIndicator = 0;
		vTaskResume( xSecondary );

		/* We need to wait a little to ensure the other task executes. */
		while( xRunIndicator != bktRUN_INDICATOR )
		{
			/* The other task has not yet executed. */
			vTaskDelay( bktSHORT_WAIT );
		}
		/* Make sure the other task is blocked on the queue. */
		vTaskDelay( bktSHORT_WAIT );
		xRunIndicator = 0;

		for( xItem = 0; xItem < bktQUEUE_LENGTH; xItem++ )
		{
			/* Now when we make space on the queue the other task should wake
			but not execute as this task has higher priority. */				
			if( xQueueAltReceive( xTestQueue, &xData, bktDONT_BLOCK ) != pdPASS )
			{
				xErrorOccurred = pdTRUE;
			}

			/* Now fill the queue again before the other task gets a chance to
			execute.  If the other task had executed we would find the queue
			full ourselves, and the other task have set xRunIndicator. */
			if( xQueueAltSendToBack( xTestQueue, &xItem, bktDONT_BLOCK ) != pdPASS )
			{
				xErrorOccurred = pdTRUE;
			}

			if( xRunIndicator == bktRUN_INDICATOR )
			{
				/* The other task should not have executed. */
				xErrorOccurred = pdTRUE;
			}

			/* Raise the priority of the other task so it executes and blocks
			on the queue again. */
			vTaskPrioritySet( xSecondary, bktPRIMARY_PRIORITY + 2 );

			/* The other task should now have re-blocked without exiting the
			queue function. */
			if( xRunIndicator == bktRUN_INDICATOR )
			{
				/* The other task should not have executed outside of the
				queue function. */
				xErrorOccurred = pdTRUE;
			}

			/* Set the priority back down. */
			vTaskPrioritySet( xSecondary, bktSECONDARY_PRIORITY );			
		}

		/* Let the other task timeout.  When it unblockes it will check that it
		unblocked at the correct time, then suspend itself. */
		while( xRunIndicator != bktRUN_INDICATOR )
		{
			vTaskDelay( bktSHORT_WAIT );
		}
		vTaskDelay( bktSHORT_WAIT );
		xRunIndicator = 0;

		#if configUSE_PREEMPTION == 0
			taskYIELD();
		#endif

		/*********************************************************************
        Test 4

		As per test 3 - but with the send and receive the other way around.
		The other task blocks attempting to read from the queue.

		Empty the queue.  We should find that it is full. */
		for( xItem = 0; xItem < bktQUEUE_LENGTH; xItem++ )
		{
			if( xQueueAltReceive( xTestQueue, &xData, bktDONT_BLOCK ) != pdPASS )
			{
				xErrorOccurred = pdTRUE;
			}
		}
		
		/* Wake the other task so it blocks attempting to read from  the
		already	empty queue. */
		vTaskResume( xSecondary );

		/* We need to wait a little to ensure the other task executes. */
		while( xRunIndicator != bktRUN_INDICATOR )
		{
			vTaskDelay( bktSHORT_WAIT );
		}
		vTaskDelay( bktSHORT_WAIT );
		xRunIndicator = 0;

		for( xItem = 0; xItem < bktQUEUE_LENGTH; xItem++ )
		{
			/* Now when we place an item on the queue the other task should
			wake but not execute as this task has higher priority. */				
			if( xQueueAltSendToBack( xTestQueue, &xItem, bktDONT_BLOCK ) != pdPASS )
			{
				xErrorOccurred = pdTRUE;
			}

			/* Now empty the queue again before the other task gets a chance to
			execute.  If the other task had executed we would find the queue
			empty ourselves, and the other task would be suspended. */
			if( xQueueAltReceive( xTestQueue, &xData, bktDONT_BLOCK ) != pdPASS )
			{
				xErrorOccurred = pdTRUE;
			}

			if( xRunIndicator == bktRUN_INDICATOR )
			{
				/* The other task should not have executed. */
				xErrorOccurred = pdTRUE;
			}

			/* Raise the priority of the other task so it executes and blocks
			on the queue again. */
			vTaskPrioritySet( xSecondary, bktPRIMARY_PRIORITY + 2 );

			/* The other task should now have re-blocked without exiting the
			queue function. */
			if( xRunIndicator == bktRUN_INDICATOR )
			{
				/* The other task should not have executed outside of the
				queue function. */
				xErrorOccurred = pdTRUE;
			}
			vTaskPrioritySet( xSecondary, bktSECONDARY_PRIORITY );			
		}

		/* Let the other task timeout.  When it unblockes it will check that it
		unblocked at the correct time, then suspend itself. */
		while( xRunIndicator != bktRUN_INDICATOR )
		{
			vTaskDelay( bktSHORT_WAIT );
		}
		vTaskDelay( bktSHORT_WAIT );

		xPrimaryCycles++;
	}
}
/*-----------------------------------------------------------*/

static void vSecondaryBlockTimeTestTask( void *pvParameters )
{
TickType_t xTimeWhenBlocking, xBlockedTime;
portBASE_TYPE xData;

	#ifdef USE_STDIO
	void vPrintDisplayMessage( const char * const * ppcMessageToSend );
	
		const char * const pcTaskStartMsg = "Alt secondary block time test started.\r\n";

		/* Queue a message for printing to say the task has started. */
		vPrintDisplayMessage( &pcTaskStartMsg );
	#endif

	( void ) pvParameters;

	for( ;; )
	{
		/*********************************************************************
        Test 1 and 2

		This task does does not participate in these tests. */
		vTaskSuspend( NULL );

		/*********************************************************************
        Test 3

		The first thing we do is attempt to read from the queue.  It should be
		full so we block.  Note the time before we block so we can check the
		wake time is as per that expected. */
		portENTER_CRITICAL();
		{
			xTimeWhenBlocking = xTaskGetTickCount();
			
			/* We should unblock after bktTIME_TO_BLOCK having not received
			anything on the queue. */
			xData = 0;
			xRunIndicator = bktRUN_INDICATOR;
			if( xQueueAltSendToBack( xTestQueue, &xData, bktTIME_TO_BLOCK ) != errQUEUE_FULL )
			{
				xErrorOccurred = pdTRUE;
			}

			/* How long were we inside the send function? */
			xBlockedTime = xTaskGetTickCount() - xTimeWhenBlocking;
		}
		portEXIT_CRITICAL();

		/* We should not have blocked for less time than bktTIME_TO_BLOCK. */
		if( xBlockedTime < bktTIME_TO_BLOCK )
		{
			xErrorOccurred = pdTRUE;
		}

		/* We should of not blocked for much longer than bktALLOWABLE_MARGIN
		either.  A margin is permitted as we would not necessarily run as
		soon as we unblocked. */
		if( xBlockedTime > ( bktTIME_TO_BLOCK + bktALLOWABLE_MARGIN ) )
		{
			xErrorOccurred = pdTRUE;
		}

		/* Suspend ready for test 3. */
		xRunIndicator = bktRUN_INDICATOR;
		vTaskSuspend( NULL );

		/*********************************************************************
        Test 4

		As per test three, but with the send and receive reversed. */
		portENTER_CRITICAL();
		{
			xTimeWhenBlocking = xTaskGetTickCount();
			
			/* We should unblock after bktTIME_TO_BLOCK having not received
			anything on the queue. */
			xRunIndicator = bktRUN_INDICATOR;
			if( xQueueAltReceive( xTestQueue, &xData, bktTIME_TO_BLOCK ) != errQUEUE_EMPTY )
			{
				xErrorOccurred = pdTRUE;
			}

			xBlockedTime = xTaskGetTickCount() - xTimeWhenBlocking;
		}
		portEXIT_CRITICAL();

		/* We should not have blocked for less time than bktTIME_TO_BLOCK. */
		if( xBlockedTime < bktTIME_TO_BLOCK )
		{
			xErrorOccurred = pdTRUE;
		}

		/* We should of not blocked for much longer than bktALLOWABLE_MARGIN
		either.  A margin is permitted as we would not necessarily run as soon
		as we unblocked. */
		if( xBlockedTime > ( bktTIME_TO_BLOCK + bktALLOWABLE_MARGIN ) )
		{
			xErrorOccurred = pdTRUE;
		}

		xRunIndicator = bktRUN_INDICATOR;

		xSecondaryCycles++;
	}
}
/*-----------------------------------------------------------*/

portBASE_TYPE xAreAltBlockTimeTestTasksStillRunning( void )
{
static portBASE_TYPE xLastPrimaryCycleCount = 0, xLastSecondaryCycleCount = 0;
portBASE_TYPE xReturn = pdPASS;

	/* Have both tasks performed at least one cycle since this function was
	last called? */
	if( xPrimaryCycles == xLastPrimaryCycleCount )
	{
		xReturn = pdFAIL;
	}

	if( xSecondaryCycles == xLastSecondaryCycleCount )
	{
		xReturn = pdFAIL;
	}

	if( xErrorOccurred == pdTRUE )
	{
		xReturn = pdFAIL;
	}

	xLastSecondaryCycleCount = xSecondaryCycles;
	xLastPrimaryCycleCount = xPrimaryCycles;

	return xReturn;
}