diff options
| author | Yuval Adam <yuv.adm@gmail.com> | 2014-08-08 14:42:07 +0300 |
|---|---|---|
| committer | Yuval Adam <yuv.adm@gmail.com> | 2014-08-08 14:42:07 +0300 |
| commit | a6163888f3c56123b1db313743c6147ba498732c (patch) | |
| tree | ff7d15d991d1d09ba6cbc0cec80924f57445bfdd /third_party/FreeRTOS/Demo/Common/Minimal/death.c | |
| parent | c3e4c9a25c2910d2d66d52215b3406b13d5b23d5 (diff) | |
Add third_party libs
Diffstat (limited to 'third_party/FreeRTOS/Demo/Common/Minimal/death.c')
| -rw-r--r-- | third_party/FreeRTOS/Demo/Common/Minimal/death.c | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/third_party/FreeRTOS/Demo/Common/Minimal/death.c b/third_party/FreeRTOS/Demo/Common/Minimal/death.c new file mode 100644 index 0000000..d6a9110 --- /dev/null +++ b/third_party/FreeRTOS/Demo/Common/Minimal/death.c @@ -0,0 +1,267 @@ +/*
+ FreeRTOS V7.6.0 - Copyright (C) 2013 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!
+*/
+
+/**
+ * Create a single persistent task which periodically dynamically creates another
+ * two tasks. The original task is called the creator task, the two tasks it
+ * creates are called suicidal tasks.
+ *
+ * One of the created suicidal tasks kill one other suicidal task before killing
+ * itself - leaving just the original task remaining.
+ *
+ * The creator task must be spawned after all of the other demo application tasks
+ * as it keeps a check on the number of tasks under the scheduler control. The
+ * number of tasks it expects to see running should never be greater than the
+ * number of tasks that were in existence when the creator task was spawned, plus
+ * one set of four suicidal tasks. If this number is exceeded an error is flagged.
+ *
+ * \page DeathC death.c
+ * \ingroup DemoFiles
+ * <HR>
+ */
+
+/*
+Changes from V3.0.0
+ + CreationCount sizes changed from unsigned portBASE_TYPE to
+ unsigned short to minimize the risk of overflowing.
+
+ + Reset of usLastCreationCount added
+
+Changes from V3.1.0
+ + Changed the dummy calculation to use variables of type long, rather than
+ float. This allows the file to be used with ports that do not support
+ floating point.
+
+*/
+
+#include <stdlib.h>
+
+/* Scheduler include files. */
+#include "FreeRTOS.h"
+#include "task.h"
+
+/* Demo program include files. */
+#include "death.h"
+
+#define deathSTACK_SIZE ( configMINIMAL_STACK_SIZE + 60 )
+
+/* The task originally created which is responsible for periodically dynamically
+creating another four tasks. */
+static portTASK_FUNCTION_PROTO( vCreateTasks, pvParameters );
+
+/* The task function of the dynamically created tasks. */
+static portTASK_FUNCTION_PROTO( vSuicidalTask, pvParameters );
+
+/* A variable which is incremented every time the dynamic tasks are created. This
+is used to check that the task is still running. */
+static volatile unsigned short usCreationCount = 0;
+
+/* Used to store the number of tasks that were originally running so the creator
+task can tell if any of the suicidal tasks have failed to die.
+*/
+static volatile unsigned portBASE_TYPE uxTasksRunningAtStart = 0;
+
+/* Tasks are deleted by the idle task. Under heavy load the idle task might
+not get much processing time, so it would be legitimate for several tasks to
+remain undeleted for a short period. */
+static const unsigned portBASE_TYPE uxMaxNumberOfExtraTasksRunning = 3;
+
+/* Used to store a handle to the task that should be killed by a suicidal task,
+before it kills itself. */
+xTaskHandle xCreatedTask;
+
+/*-----------------------------------------------------------*/
+
+void vCreateSuicidalTasks( unsigned portBASE_TYPE uxPriority )
+{
+unsigned portBASE_TYPE *puxPriority;
+
+ /* Create the Creator tasks - passing in as a parameter the priority at which
+ the suicidal tasks should be created. */
+ puxPriority = ( unsigned portBASE_TYPE * ) pvPortMalloc( sizeof( unsigned portBASE_TYPE ) );
+ *puxPriority = uxPriority;
+
+ xTaskCreate( vCreateTasks, ( signed char * ) "CREATOR", deathSTACK_SIZE, ( void * ) puxPriority, uxPriority, NULL );
+
+ /* Record the number of tasks that are running now so we know if any of the
+ suicidal tasks have failed to be killed. */
+ uxTasksRunningAtStart = ( unsigned portBASE_TYPE ) uxTaskGetNumberOfTasks();
+
+ /* FreeRTOS.org versions before V3.0 started the idle-task as the very
+ first task. The idle task was then already included in uxTasksRunningAtStart.
+ From FreeRTOS V3.0 on, the idle task is started when the scheduler is
+ started. Therefore the idle task is not yet accounted for. We correct
+ this by increasing uxTasksRunningAtStart by 1. */
+ uxTasksRunningAtStart++;
+
+ /* From FreeRTOS version 7.0.0 can optionally create a timer service task.
+ If this is done, then uxTasksRunningAtStart needs incrementing again as that
+ too is created when the scheduler is started. */
+ #if configUSE_TIMERS == 1
+ uxTasksRunningAtStart++;
+ #endif
+}
+/*-----------------------------------------------------------*/
+
+static portTASK_FUNCTION( vSuicidalTask, pvParameters )
+{
+volatile long l1, l2;
+xTaskHandle xTaskToKill;
+const portTickType xDelay = ( portTickType ) 200 / portTICK_RATE_MS;
+
+ if( pvParameters != NULL )
+ {
+ /* This task is periodically created four times. Two created tasks are
+ passed a handle to the other task so it can kill it before killing itself.
+ The other task is passed in null. */
+ xTaskToKill = *( xTaskHandle* )pvParameters;
+ }
+ else
+ {
+ xTaskToKill = NULL;
+ }
+
+ for( ;; )
+ {
+ /* Do something random just to use some stack and registers. */
+ l1 = 2;
+ l2 = 89;
+ l2 *= l1;
+ vTaskDelay( xDelay );
+
+ if( xTaskToKill != NULL )
+ {
+ /* Make sure the other task has a go before we delete it. */
+ vTaskDelay( ( portTickType ) 0 );
+
+ /* Kill the other task that was created by vCreateTasks(). */
+ vTaskDelete( xTaskToKill );
+
+ /* Kill ourselves. */
+ vTaskDelete( NULL );
+ }
+ }
+}/*lint !e818 !e550 Function prototype must be as per standard for task functions. */
+/*-----------------------------------------------------------*/
+
+static portTASK_FUNCTION( vCreateTasks, pvParameters )
+{
+const portTickType xDelay = ( portTickType ) 1000 / portTICK_RATE_MS;
+unsigned portBASE_TYPE uxPriority;
+
+ uxPriority = *( unsigned portBASE_TYPE * ) pvParameters;
+ vPortFree( pvParameters );
+
+ for( ;; )
+ {
+ /* Just loop round, delaying then creating the four suicidal tasks. */
+ vTaskDelay( xDelay );
+
+ xCreatedTask = NULL;
+
+ xTaskCreate( vSuicidalTask, ( signed char * ) "SUICID1", configMINIMAL_STACK_SIZE, NULL, uxPriority, &xCreatedTask );
+ xTaskCreate( vSuicidalTask, ( signed char * ) "SUICID2", configMINIMAL_STACK_SIZE, &xCreatedTask, uxPriority, NULL );
+
+ ++usCreationCount;
+ }
+}
+/*-----------------------------------------------------------*/
+
+/* This is called to check that the creator task is still running and that there
+are not any more than four extra tasks. */
+portBASE_TYPE xIsCreateTaskStillRunning( void )
+{
+static unsigned short usLastCreationCount = 0xfff;
+portBASE_TYPE xReturn = pdTRUE;
+static unsigned portBASE_TYPE uxTasksRunningNow;
+
+ if( usLastCreationCount == usCreationCount )
+ {
+ xReturn = pdFALSE;
+ }
+ else
+ {
+ usLastCreationCount = usCreationCount;
+ }
+
+ uxTasksRunningNow = ( unsigned portBASE_TYPE ) uxTaskGetNumberOfTasks();
+
+ if( uxTasksRunningNow < uxTasksRunningAtStart )
+ {
+ xReturn = pdFALSE;
+ }
+ else if( ( uxTasksRunningNow - uxTasksRunningAtStart ) > uxMaxNumberOfExtraTasksRunning )
+ {
+ xReturn = pdFALSE;
+ }
+ else
+ {
+ /* Everything is okay. */
+ }
+
+ return xReturn;
+}
+
+
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