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First version under SVN is V4.0.1
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Richard Barry
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Demo/Common/Minimal/death.c
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Demo/Common/Minimal/death.c
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/*
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FreeRTOS V4.0.1 - Copyright (C) 2003-2006 Richard Barry.
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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
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FreeRTOS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FreeRTOS; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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A special exception to the GPL can be applied should you wish to distribute
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a combined work that includes FreeRTOS, without being obliged to provide
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the source code for any proprietary components. See the licensing section
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of http://www.FreeRTOS.org for full details of how and when the exception
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can be applied.
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***************************************************************************
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See http://www.FreeRTOS.org for documentation, latest information, license
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and contact details. Please ensure to read the configuration and relevant
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port sections of the online documentation.
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***************************************************************************
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*/
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/**
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* Create a single persistent task which periodically dynamically creates another
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* four tasks. The original task is called the creator task, the four tasks it
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* creates are called suicidal tasks.
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*
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* Two of the created suicidal tasks kill one other suicidal task before killing
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* themselves - leaving just the original task remaining.
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*
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* The creator task must be spawned after all of the other demo application tasks
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* as it keeps a check on the number of tasks under the scheduler control. The
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* number of tasks it expects to see running should never be greater than the
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* number of tasks that were in existence when the creator task was spawned, plus
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* one set of four suicidal tasks. If this number is exceeded an error is flagged.
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*
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* \page DeathC death.c
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* \ingroup DemoFiles
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* <HR>
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*/
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/*
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Changes from V3.0.0
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+ CreationCount sizes changed from unsigned portBASE_TYPE to
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unsigned portSHORT to minimize the risk of overflowing.
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+ Reset of usLastCreationCount added
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Changes from V3.1.0
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+ Changed the dummy calculation to use variables of type long, rather than
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float. This allows the file to be used with ports that do not support
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floating point.
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*/
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#include <stdlib.h>
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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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/* Demo program include files. */
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#include "death.h"
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#define deathSTACK_SIZE ( configMINIMAL_STACK_SIZE + 24 )
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/* The task originally created which is responsible for periodically dynamically
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creating another four tasks. */
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static portTASK_FUNCTION_PROTO( vCreateTasks, pvParameters );
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/* The task function of the dynamically created tasks. */
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static portTASK_FUNCTION_PROTO( vSuicidalTask, pvParameters );
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/* A variable which is incremented every time the dynamic tasks are created. This
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is used to check that the task is still running. */
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static volatile unsigned portSHORT usCreationCount = 0;
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/* Used to store the number of tasks that were originally running so the creator
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task can tell if any of the suicidal tasks have failed to die.
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*/
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static volatile unsigned portBASE_TYPE uxTasksRunningAtStart = 0;
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/* Tasks are deleted by the idle task. Under heavy load the idle task might
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not get much processing time, so it would be legitimate for several tasks to
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remain undeleted for a short period. */
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static const unsigned portBASE_TYPE uxMaxNumberOfExtraTasksRunning = 4;
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/* Used to store a handle to the tasks that should be killed by a suicidal task,
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before it kills itself. */
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xTaskHandle xCreatedTask1, xCreatedTask2;
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/*-----------------------------------------------------------*/
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void vCreateSuicidalTasks( unsigned portBASE_TYPE uxPriority )
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{
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unsigned portBASE_TYPE *puxPriority;
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/* Create the Creator tasks - passing in as a parameter the priority at which
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the suicidal tasks should be created. */
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puxPriority = ( unsigned portBASE_TYPE * ) pvPortMalloc( sizeof( unsigned portBASE_TYPE ) );
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*puxPriority = uxPriority;
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xTaskCreate( vCreateTasks, "CREATOR", deathSTACK_SIZE, ( void * ) puxPriority, uxPriority, NULL );
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/* Record the number of tasks that are running now so we know if any of the
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suicidal tasks have failed to be killed. */
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uxTasksRunningAtStart = ( unsigned portBASE_TYPE ) uxTaskGetNumberOfTasks();
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/* FreeRTOS versions before V3.0 started the idle-task as the very
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first task. The idle task was then already included in uxTasksRunningAtStart.
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From FreeRTOS V3.0 on, the idle task is started when the scheduler is
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started. Therefore the idle task is not yet accounted for. We correct
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this by increasing uxTasksRunningAtStart by 1. */
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uxTasksRunningAtStart++;
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}
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/*-----------------------------------------------------------*/
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static portTASK_FUNCTION( vSuicidalTask, pvParameters )
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{
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volatile portLONG l1, l2;
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xTaskHandle xTaskToKill;
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const portTickType xDelay = ( portTickType ) 200 / portTICK_RATE_MS;
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if( pvParameters != NULL )
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{
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/* This task is periodically created four times. Two created tasks are
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passed a handle to the other task so it can kill it before killing itself.
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The other task is passed in null. */
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xTaskToKill = *( xTaskHandle* )pvParameters;
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}
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else
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{
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xTaskToKill = NULL;
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}
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for( ;; )
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{
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/* Do something random just to use some stack and registers. */
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l1 = 2;
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l2 = 89;
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l2 *= l1;
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vTaskDelay( xDelay );
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if( xTaskToKill != NULL )
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{
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/* Make sure the other task has a go before we delete it. */
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vTaskDelay( ( portTickType ) 0 );
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/* Kill the other task that was created by vCreateTasks(). */
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vTaskDelete( xTaskToKill );
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/* Kill ourselves. */
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vTaskDelete( NULL );
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}
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}
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}/*lint !e818 !e550 Function prototype must be as per standard for task functions. */
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/*-----------------------------------------------------------*/
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static portTASK_FUNCTION( vCreateTasks, pvParameters )
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{
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const portTickType xDelay = ( portTickType ) 1000 / portTICK_RATE_MS;
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unsigned portBASE_TYPE uxPriority;
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uxPriority = *( unsigned portBASE_TYPE * ) pvParameters;
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vPortFree( pvParameters );
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for( ;; )
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{
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/* Just loop round, delaying then creating the four suicidal tasks. */
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vTaskDelay( xDelay );
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xTaskCreate( vSuicidalTask, "SUICID1", deathSTACK_SIZE, NULL, uxPriority, &xCreatedTask1 );
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xTaskCreate( vSuicidalTask, "SUICID2", deathSTACK_SIZE, &xCreatedTask1, uxPriority, NULL );
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xTaskCreate( vSuicidalTask, "SUICID1", deathSTACK_SIZE, NULL, uxPriority, &xCreatedTask2 );
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xTaskCreate( vSuicidalTask, "SUICID2", deathSTACK_SIZE, &xCreatedTask2, uxPriority, NULL );
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++usCreationCount;
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}
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}
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/*-----------------------------------------------------------*/
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/* This is called to check that the creator task is still running and that there
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are not any more than four extra tasks. */
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portBASE_TYPE xIsCreateTaskStillRunning( void )
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{
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static portSHORT usLastCreationCount = -1;
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portBASE_TYPE xReturn = pdTRUE;
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static unsigned portBASE_TYPE uxTasksRunningNow;
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if( usLastCreationCount == usCreationCount )
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{
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xReturn = pdFALSE;
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}
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else
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{
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usLastCreationCount = usCreationCount;
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}
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uxTasksRunningNow = ( unsigned portBASE_TYPE ) uxTaskGetNumberOfTasks();
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if( uxTasksRunningNow < uxTasksRunningAtStart )
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{
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xReturn = pdFALSE;
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}
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else if( ( uxTasksRunningNow - uxTasksRunningAtStart ) > uxMaxNumberOfExtraTasksRunning )
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{
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xReturn = pdFALSE;
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}
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else
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{
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/* Everything is okay. */
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}
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return xReturn;
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}
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