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Allow tasks to be suspended immediately after creation - provided the scheduler is not running.

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Add API function that allows the tick count to be queried from an interrupt.
This commit is contained in:
Richard Barry 2010-09-23 13:54:37 +00:00
parent ad451e8b70
commit 7ce7d21ca8
2 changed files with 35 additions and 13 deletions
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34
Source/include/task.h
View file

@ -33,9 +33,9 @@
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. See the GNU General Public License for
more details. You should have received a copy of the GNU General Public
License and the FreeRTOS license exception along with FreeRTOS; if not it
can be viewed here: http://www.freertos.org/a00114.html and also obtained
more details. You should have received a copy of the GNU General Public
License and the FreeRTOS license exception along with FreeRTOS; if not it
can be viewed here: http://www.freertos.org/a00114.html and also obtained
by writing to Richard Barry, contact details for whom are available on the
FreeRTOS WEB site.
@ -206,10 +206,10 @@ typedef struct xTASK_PARAMTERS
);</pre>
*
* Create a new task and add it to the list of tasks that are ready to run.
*
*
* xTaskCreate() can only be used to create a task that has unrestricted
* access to the entire microcontroller memory map. Systems that include MPU
* support can alternatively create an MPU constrained task using
* support can alternatively create an MPU constrained task using
* xTaskCreateRestricted().
*
* @param pvTaskCode Pointer to the task entry function. Tasks
@ -285,7 +285,7 @@ typedef struct xTASK_PARAMTERS
*
* @param pxTaskDefinition Pointer to a structure that contains a member
* for each of the normal xTaskCreate() parameters (see the xTaskCreate() API
* documentation) plus an optional stack buffer and the memory region
* documentation) plus an optional stack buffer and the memory region
* definitions.
*
* @param pxCreatedTask Used to pass back a handle by which the created task
@ -348,7 +348,7 @@ xTaskHandle xHandle;
* Memory regions are assigned to a restricted task when the task is created by
* a call to xTaskCreateRestricted(). These regions can be redefined using
* vTaskAllocateMPURegions().
*
*
* @param xTask The handle of the task being updated.
*
* @param xRegions A pointer to an xMemoryRegion structure that contains the
@ -371,7 +371,7 @@ static const xMemoryRegion xAltRegions[ portNUM_CONFIGURABLE_REGIONS ] =
void vATask( void *pvParameters )
{
// This task was created such that it has access to certain regions of
// memory as defined by the MPU configuration. At some point it is
// memory as defined by the MPU configuration. At some point it is
// desired that these MPU regions are replaced with that defined in the
// xAltRegions const struct above. Use a call to vTaskAllocateMPURegions()
// for this purpose. NULL is used as the task handle to indicate that this
@ -963,7 +963,7 @@ signed portBASE_TYPE xTaskIsTaskSuspended( xTaskHandle xTask ) PRIVILEGED_FUNCTI
/**
* task. h
* <PRE>volatile portTickType xTaskGetTickCount( void );</PRE>
* <PRE>portTickType xTaskGetTickCount( void );</PRE>
*
* @return The count of ticks since vTaskStartScheduler was called.
*
@ -972,6 +972,22 @@ signed portBASE_TYPE xTaskIsTaskSuspended( xTaskHandle xTask ) PRIVILEGED_FUNCTI
*/
portTickType xTaskGetTickCount( void ) PRIVILEGED_FUNCTION;
/**
* task. h
* <PRE>portTickType xTaskGetTickCountFromISR( void );</PRE>
*
* @return The count of ticks since vTaskStartScheduler was called.
*
* This is a version of xTaskGetTickCount() that is safe to be called from an
* ISR - provided that portTickType is the natural word size of the
* microcontroller being used or interrupt nesting is either not supported or
* not being used.
*
* \page xTaskGetTickCount xTaskGetTickCount
* \ingroup TaskUtils
*/
portTickType xTaskGetTickCountFromISR( void ) PRIVILEGED_FUNCTION;
/**
* task. h
* <PRE>unsigned short uxTaskGetNumberOfTasks( void );</PRE>

14
Source/tasks.c
View file

@ -33,9 +33,9 @@
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. See the GNU General Public License for
more details. You should have received a copy of the GNU General Public
License and the FreeRTOS license exception along with FreeRTOS; if not it
can be viewed here: http://www.freertos.org/a00114.html and also obtained
more details. You should have received a copy of the GNU General Public
License and the FreeRTOS license exception along with FreeRTOS; if not it
can be viewed here: http://www.freertos.org/a00114.html and also obtained
by writing to Richard Barry, contact details for whom are available on the
FreeRTOS WEB site.
@ -894,7 +894,7 @@ tskTCB * pxNewTCB;
portEXIT_CRITICAL();
/* We may have just suspended the current task. */
if( ( void * ) pxTaskToSuspend == NULL )
if( ( ( void * ) pxTaskToSuspend == NULL ) && ( xSchedulerRunning != pdFALSE ) )
{
portYIELD_WITHIN_API();
}
@ -1175,6 +1175,12 @@ portTickType xTicks;
}
/*-----------------------------------------------------------*/
portTickType xTaskGetTickCountFromISR( void )
{
return xTickCount;
}
/*-----------------------------------------------------------*/
unsigned portBASE_TYPE uxTaskGetNumberOfTasks( void )
{
/* A critical section is not required because the variables are of type