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prvListTasksWithinSingleList() function
Syntax
static UBaseType_t prvListTasksWithinSingleList( TaskStatus_t *pxTaskStatusArray,
List_t *pxList,
eTaskState eState ) PRIVILEGED_FUNCTION;
Implemented in ![]()
tasks.c:3766
Related Functions
Found 4 other functions taking a ![]()
xTASK_STATUS
argument:
Function
Description
configUSE_TRACE_FACILITY must be defined as 1 in FreeRTOSConfig.h for uxTaskGetSystemState() to be available. uxTaskGetSystemState() populates an TaskStatus_t structure for each task in the system. TaskStatus_t structures contain, among other things, members for the task handle, task name, task priority, task state, and total amount of run time consumed by the task. See the TaskStatus_t structure definition in this file for the full member list. NOTE: This function is intended for debugging use only as its use results in the scheduler remaining suspended for an extended period. Example usage:
// This example demonstrates how a human readable table of run time stats
// information is generated from raw data provided by uxTaskGetSystemState().
// The human readable table is written to pcWriteBuffer
void vTaskGetRunTimeStats( char *pcWriteBuffer )
{
TaskStatus_t *pxTaskStatusArray;
volatile UBaseType_t uxArraySize, x;
uint32_t ulTotalRunTime, ulStatsAsPercentage;
// Make sure the write buffer does not contain a string.
pcWriteBuffer = 0x00;
// Take a snapshot of the number of tasks in case it changes while this
// function is executing.
uxArraySize = uxTaskGetNumberOfTasks();
// Allocate a TaskStatus_t structure for each task. An array could be
// allocated statically at compile time.
pxTaskStatusArray = pvPortMalloc( uxArraySize * sizeof( TaskStatus_t ) );
if( pxTaskStatusArray != NULL )
{
// Generate raw status information about each task.
uxArraySize = uxTaskGetSystemState( pxTaskStatusArray, uxArraySize, &ulTotalRunTime );
// For percentage calculations.
ulTotalRunTime /= 100UL;
// Avoid divide by zero errors.
if( ulTotalRunTime > 0 )
{
// For each populated position in the pxTaskStatusArray array,
// format the raw data as human readable ASCII data
for( x = 0; x < uxArraySize; x++ )
{
// What percentage of the total run time has the task used?
// This will always be rounded down to the nearest integer.
// ulTotalRunTimeDiv100 has already been divided by 100.
ulStatsAsPercentage = pxTaskStatusArray[ x ].ulRunTimeCounter / ulTotalRunTime;
if( ulStatsAsPercentage > 0UL )
{
sprintf( pcWriteBuffer, "%s\t\t%lu\t\t%lu%%\r\n", pxTaskStatusArray[ x ].pcTaskName, pxTaskStatusArray[ x ].ulRunTimeCounter, ulStatsAsPercentage );
}
else
{
// If the percentage is zero here then the task has
// consumed less than 1% of the total run time.
sprintf( pcWriteBuffer, "%s\t\t%lu\t\t<1%%\r\n", pxTaskStatusArray[ x ].pcTaskName, pxTaskStatusArray[ x ].ulRunTimeCounter );
}
pcWriteBuffer += strlen( ( char * ) pcWriteBuffer );
}
}
// The array is no longer needed, free the memory it consumes.
vPortFree( pxTaskStatusArray );
}
}
configUSE_TRACE_FACILITY must be defined as 1 for this function to be available. See the configuration section for more information. Populates a TaskStatus_t structure with information about a task. @xGetFreeStackSpace The TaskStatus_t structure contains a member to report the stack high water mark of the task being queried. Calculating the stack high water mark takes a relatively long time, and can make the system temporarily unresponsive - so the xGetFreeStackSpace parameter is provided to allow the high water mark checking to be skipped. The high watermark value will only be written to the TaskStatus_t structure if xGetFreeStackSpace is not set to pdFALSE; Example usage:
void vAFunction( void )
{
TaskHandle_t xHandle;
TaskStatus_t xTaskDetails;
// Obtain the handle of a task from its name.
xHandle = xTaskGetHandle( "Task_Name" );
// Check the handle is not NULL.
configASSERT( xHandle );
// Use the handle to obtain further information about the task.
vTaskGetInfo( xHandle,
&xTaskDetails,
pdTRUE, // Include the high water mark in xTaskDetails.
eInvalid ); // Include the task state in xTaskDetails.
}
configUSE_TRACE_FACILITY must be defined as 1 for this function to be available. See the configuration section for more information. Populates a TaskStatus_t structure with information about a task. @xGetFreeStackSpace The TaskStatus_t structure contains a member to report the stack high water mark of the task being queried. Calculating the stack high water mark takes a relatively long time, and can make the system temporarily unresponsive - so the xGetFreeStackSpace parameter is provided to allow the high water mark checking to be skipped. The high watermark value will only be written to the TaskStatus_t structure if xGetFreeStackSpace is not set to pdFALSE; Example usage:
void vAFunction( void )
{
TaskHandle_t xHandle;
TaskStatus_t xTaskDetails;
// Obtain the handle of a task from its name.
xHandle = xTaskGetHandle( "Task_Name" );
// Check the handle is not NULL.
configASSERT( xHandle );
// Use the handle to obtain further information about the task.
vTaskGetInfo( xHandle,
&xTaskDetails,
pdTRUE, // Include the high water mark in xTaskDetails.
eInvalid ); // Include the task state in xTaskDetails.
}
References
Code
Location
Referrer
Call Tree
prvListTasksWithinSingleList() is called by 1 function and calls 1 function:
Data Use
prvListTasksWithinSingleList() reads 5 variables and writes 1 variable: