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20100923-V6.1.0-RC2/Demo/Common/Minimal/countsem.c
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20100923-V6.1.0-RC2/Demo/Common/Minimal/countsem.c
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/*
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FreeRTOS V6.1.0 - Copyright (C) 2010 Real Time Engineers Ltd.
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***************************************************************************
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* *
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* If you are: *
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* *
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* + New to FreeRTOS, *
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* + Wanting to learn FreeRTOS or multitasking in general quickly *
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* + Looking for basic training, *
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* + Wanting to improve your FreeRTOS skills and productivity *
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* *
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* then take a look at the FreeRTOS books - available as PDF or paperback *
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* *
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* "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
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* http://www.FreeRTOS.org/Documentation *
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* *
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* A pdf reference manual is also available. Both are usually delivered *
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* to your inbox within 20 minutes to two hours when purchased between 8am *
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* and 8pm GMT (although please allow up to 24 hours in case of *
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* exceptional circumstances). Thank you for your support! *
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* *
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***************************************************************************
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This file is part of the FreeRTOS distribution.
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FreeRTOS is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License (version 2) as published by the
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Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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***NOTE*** The exception to the GPL is included to allow you to distribute
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a combined work that includes FreeRTOS without being obliged to provide the
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source code for proprietary components outside of the FreeRTOS kernel.
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details. You should have received a copy of the GNU General Public
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License and the FreeRTOS license exception along with FreeRTOS; if not it
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can be viewed here: http://www.freertos.org/a00114.html and also obtained
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by writing to Richard Barry, contact details for whom are available on the
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FreeRTOS WEB site.
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1 tab == 4 spaces!
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http://www.FreeRTOS.org - Documentation, latest information, license and
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contact details.
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http://www.SafeRTOS.com - A version that is certified for use in safety
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critical systems.
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http://www.OpenRTOS.com - Commercial support, development, porting,
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licensing and training services.
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*/
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/*
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* Simple demonstration of the usage of counting semaphore.
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*/
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/* Scheduler include files. */
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#include "FreeRTOS.h"
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#include "task.h"
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#include "semphr.h"
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/* Demo program include files. */
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#include "countsem.h"
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/* The maximum count value that the semaphore used for the demo can hold. */
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#define countMAX_COUNT_VALUE ( 200 )
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/* Constants used to indicate whether or not the semaphore should have been
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created with its maximum count value, or its minimum count value. These
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numbers are used to ensure that the pointers passed in as the task parameters
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are valid. */
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#define countSTART_AT_MAX_COUNT ( 0xaa )
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#define countSTART_AT_ZERO ( 0x55 )
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/* Two tasks are created for the test. One uses a semaphore created with its
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count value set to the maximum, and one with the count value set to zero. */
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#define countNUM_TEST_TASKS ( 2 )
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#define countDONT_BLOCK ( 0 )
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/*-----------------------------------------------------------*/
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/* Flag that will be latched to pdTRUE should any unexpected behaviour be
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detected in any of the tasks. */
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static volatile portBASE_TYPE xErrorDetected = pdFALSE;
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/*-----------------------------------------------------------*/
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/*
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* The demo task. This simply counts the semaphore up to its maximum value,
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* the counts it back down again. The result of each semaphore 'give' and
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* 'take' is inspected, with an error being flagged if it is found not to be
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* the expected result.
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*/
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static void prvCountingSemaphoreTask( void *pvParameters );
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/*
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* Utility function to increment the semaphore count value up from zero to
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* countMAX_COUNT_VALUE.
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*/
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static void prvIncrementSemaphoreCount( xSemaphoreHandle xSemaphore, unsigned portBASE_TYPE *puxLoopCounter );
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/*
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* Utility function to decrement the semaphore count value up from
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* countMAX_COUNT_VALUE to zero.
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*/
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static void prvDecrementSemaphoreCount( xSemaphoreHandle xSemaphore, unsigned portBASE_TYPE *puxLoopCounter );
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/*-----------------------------------------------------------*/
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/* The structure that is passed into the task as the task parameter. */
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typedef struct COUNT_SEM_STRUCT
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{
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/* The semaphore to be used for the demo. */
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xSemaphoreHandle xSemaphore;
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/* Set to countSTART_AT_MAX_COUNT if the semaphore should be created with
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its count value set to its max count value, or countSTART_AT_ZERO if it
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should have been created with its count value set to 0. */
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unsigned portBASE_TYPE uxExpectedStartCount;
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/* Incremented on each cycle of the demo task. Used to detect a stalled
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task. */
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unsigned portBASE_TYPE uxLoopCounter;
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} xCountSemStruct;
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/* Two structures are defined, one is passed to each test task. */
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static volatile xCountSemStruct xParameters[ countNUM_TEST_TASKS ];
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/*-----------------------------------------------------------*/
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void vStartCountingSemaphoreTasks( void )
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{
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/* Create the semaphores that we are going to use for the test/demo. The
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first should be created such that it starts at its maximum count value,
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the second should be created such that it starts with a count value of zero. */
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xParameters[ 0 ].xSemaphore = xSemaphoreCreateCounting( countMAX_COUNT_VALUE, countMAX_COUNT_VALUE );
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xParameters[ 0 ].uxExpectedStartCount = countSTART_AT_MAX_COUNT;
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xParameters[ 0 ].uxLoopCounter = 0;
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xParameters[ 1 ].xSemaphore = xSemaphoreCreateCounting( countMAX_COUNT_VALUE, 0 );
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xParameters[ 1 ].uxExpectedStartCount = 0;
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xParameters[ 1 ].uxLoopCounter = 0;
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/* vQueueAddToRegistry() adds the semaphore to the registry, if one is
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in use. The registry is provided as a means for kernel aware
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debuggers to locate semaphores and has no purpose if a kernel aware debugger
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is not being used. The call to vQueueAddToRegistry() will be removed
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by the pre-processor if configQUEUE_REGISTRY_SIZE is not defined or is
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defined to be less than 1. */
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vQueueAddToRegistry( ( xQueueHandle ) xParameters[ 0 ].xSemaphore, ( signed portCHAR * ) "Counting_Sem_1" );
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vQueueAddToRegistry( ( xQueueHandle ) xParameters[ 1 ].xSemaphore, ( signed portCHAR * ) "Counting_Sem_2" );
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/* Were the semaphores created? */
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if( ( xParameters[ 0 ].xSemaphore != NULL ) || ( xParameters[ 1 ].xSemaphore != NULL ) )
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{
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/* Create the demo tasks, passing in the semaphore to use as the parameter. */
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xTaskCreate( prvCountingSemaphoreTask, ( signed portCHAR * ) "CNT1", configMINIMAL_STACK_SIZE, ( void * ) &( xParameters[ 0 ] ), tskIDLE_PRIORITY, NULL );
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xTaskCreate( prvCountingSemaphoreTask, ( signed portCHAR * ) "CNT2", configMINIMAL_STACK_SIZE, ( void * ) &( xParameters[ 1 ] ), tskIDLE_PRIORITY, NULL );
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}
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}
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/*-----------------------------------------------------------*/
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static void prvDecrementSemaphoreCount( xSemaphoreHandle xSemaphore, unsigned portBASE_TYPE *puxLoopCounter )
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{
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unsigned portBASE_TYPE ux;
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/* If the semaphore count is at its maximum then we should not be able to
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'give' the semaphore. */
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if( xSemaphoreGive( xSemaphore ) == pdPASS )
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{
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xErrorDetected = pdTRUE;
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}
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/* We should be able to 'take' the semaphore countMAX_COUNT_VALUE times. */
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for( ux = 0; ux < countMAX_COUNT_VALUE; ux++ )
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{
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if( xSemaphoreTake( xSemaphore, countDONT_BLOCK ) != pdPASS )
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{
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/* We expected to be able to take the semaphore. */
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xErrorDetected = pdTRUE;
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}
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( *puxLoopCounter )++;
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}
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#if configUSE_PREEMPTION == 0
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taskYIELD();
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#endif
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/* If the semaphore count is zero then we should not be able to 'take'
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the semaphore. */
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if( xSemaphoreTake( xSemaphore, countDONT_BLOCK ) == pdPASS )
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{
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xErrorDetected = pdTRUE;
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}
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}
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/*-----------------------------------------------------------*/
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static void prvIncrementSemaphoreCount( xSemaphoreHandle xSemaphore, unsigned portBASE_TYPE *puxLoopCounter )
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{
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unsigned portBASE_TYPE ux;
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/* If the semaphore count is zero then we should not be able to 'take'
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the semaphore. */
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if( xSemaphoreTake( xSemaphore, countDONT_BLOCK ) == pdPASS )
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{
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xErrorDetected = pdTRUE;
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}
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/* We should be able to 'give' the semaphore countMAX_COUNT_VALUE times. */
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for( ux = 0; ux < countMAX_COUNT_VALUE; ux++ )
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{
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if( xSemaphoreGive( xSemaphore ) != pdPASS )
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{
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/* We expected to be able to take the semaphore. */
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xErrorDetected = pdTRUE;
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}
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( *puxLoopCounter )++;
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}
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#if configUSE_PREEMPTION == 0
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taskYIELD();
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#endif
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/* If the semaphore count is at its maximum then we should not be able to
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'give' the semaphore. */
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if( xSemaphoreGive( xSemaphore ) == pdPASS )
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{
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xErrorDetected = pdTRUE;
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}
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}
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/*-----------------------------------------------------------*/
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static void prvCountingSemaphoreTask( void *pvParameters )
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{
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xCountSemStruct *pxParameter;
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#ifdef USE_STDIO
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void vPrintDisplayMessage( const portCHAR * const * ppcMessageToSend );
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const portCHAR * const pcTaskStartMsg = "Counting semaphore demo started.\r\n";
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/* Queue a message for printing to say the task has started. */
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vPrintDisplayMessage( &pcTaskStartMsg );
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#endif
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/* The semaphore to be used was passed as the parameter. */
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pxParameter = ( xCountSemStruct * ) pvParameters;
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/* Did we expect to find the semaphore already at its max count value, or
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at zero? */
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if( pxParameter->uxExpectedStartCount == countSTART_AT_MAX_COUNT )
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{
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prvDecrementSemaphoreCount( pxParameter->xSemaphore, &( pxParameter->uxLoopCounter ) );
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}
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/* Now we expect the semaphore count to be 0, so this time there is an
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error if we can take the semaphore. */
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if( xSemaphoreTake( pxParameter->xSemaphore, 0 ) == pdPASS )
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{
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xErrorDetected = pdTRUE;
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}
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for( ;; )
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{
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prvIncrementSemaphoreCount( pxParameter->xSemaphore, &( pxParameter->uxLoopCounter ) );
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prvDecrementSemaphoreCount( pxParameter->xSemaphore, &( pxParameter->uxLoopCounter ) );
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}
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}
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/*-----------------------------------------------------------*/
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portBASE_TYPE xAreCountingSemaphoreTasksStillRunning( void )
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{
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static unsigned portBASE_TYPE uxLastCount0 = 0, uxLastCount1 = 0;
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portBASE_TYPE xReturn = pdPASS;
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/* Return fail if any 'give' or 'take' did not result in the expected
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behaviour. */
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if( xErrorDetected != pdFALSE )
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{
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xReturn = pdFAIL;
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}
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/* Return fail if either task is not still incrementing its loop counter. */
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if( uxLastCount0 == xParameters[ 0 ].uxLoopCounter )
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{
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xReturn = pdFAIL;
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}
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else
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{
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uxLastCount0 = xParameters[ 0 ].uxLoopCounter;
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}
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if( uxLastCount1 == xParameters[ 1 ].uxLoopCounter )
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{
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xReturn = pdFAIL;
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}
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else
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{
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uxLastCount1 = xParameters[ 1 ].uxLoopCounter;
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}
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return xReturn;
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}
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