fsfw/tasks/TaskFactory.h
2021-03-23 11:33:40 +01:00

99 lines
3.5 KiB
C++

#ifndef FSFW_TASKS_TASKFACTORY_H_
#define FSFW_TASKS_TASKFACTORY_H_
#include "FixedTimeslotTaskIF.h"
#include "Typedef.h"
#include <cstdlib>
/**
* Singleton Class that produces Tasks.
*/
class TaskFactory {
public:
virtual ~TaskFactory();
/**
* Returns the single instance of TaskFactory.
* The implementation of #instance is found in its subclasses.
* Thus, we choose link-time variability of the instance.
*/
static TaskFactory* instance();
/**
* Creates a new periodic task and returns the interface pointer.
* @param name_ Name of the task
* @param taskPriority_
* Priority of the task. This value might have different ranges for the various OSALs.
* - Linux Value ranging from 0 to 99 with 99 being the highest value.
* - Host For Windows, the value can be retrieved by using the #tasks::makeWinPriority
* function. For Linux, same priority system as specified above. MacOS not tested
* yet
* - FreeRTOS Value depends on the FreeRTOS configuration, higher number means higher priority
* - RTEMS Values ranging from 0 to 99 with 99 being the highest value.
*
* @param stackSize_ Stack Size of the task
* This value might have different recommended ranges for the various OSALs.
* - Linux Lowest limit is the PeriodicTaskIF::MINIMUM_STACK_SIZE value
* - Host Value is ignored for now because the C++ threading abstraction layer is used.
* - FreeRTOS Stack size in bytes. It is recommended to specify at least 1kB of stack for
* FSFW tasks, but the lowest possible size is specified in the
* FreeRTOSConfig.h file.
* - RTEMS Lowest limit is specified the PeriodicTaskIF::MINIMUM_STACK_SIZE value.
*
* @param period_ Period of the task
*
* @param deadLineMissedFunction_ Function to be called if a deadline was missed
* @return PeriodicTaskIF* Pointer to the newly created Task
*/
PeriodicTaskIF* createPeriodicTask(TaskName name_,
TaskPriority taskPriority_, TaskStackSize stackSize_,
TaskPeriod periodInSeconds_,
TaskDeadlineMissedFunction deadLineMissedFunction_);
/**
* The meaning for the variables for fixed timeslot tasks is the same as for periodic tasks.
* See #createPeriodicTask documentation.
* @param name_ Name of the task
* @param taskPriority_ Priority of the task
* @param stackSize_ Stack Size of the task
* @param period_ Period of the task
* @param deadLineMissedFunction_ Function to be called if a deadline was missed
* @return FixedTimeslotTaskIF* Pointer to the newly created Task
*/
FixedTimeslotTaskIF* createFixedTimeslotTask(TaskName name_,
TaskPriority taskPriority_, TaskStackSize stackSize_,
TaskPeriod periodInSeconds_,
TaskDeadlineMissedFunction deadLineMissedFunction_);
/**
* Function to be called to delete a task
* @param task The pointer to the task that shall be deleted,
* nullptr specifies current Task
* @return Success of deletion
*/
static ReturnValue_t deleteTask(PeriodicTaskIF* task = nullptr);
/**
* Function to be called to delay current task
* @param delay The delay in milliseconds
* @return Success of deletion
*/
static ReturnValue_t delayTask(uint32_t delayMs);
/**
* OS specific implementation to print deadline. In most cases, there is a OS specific
* way to retrieve the task name and print it out as well.
*/
static void printMissedDeadline();
private:
/**
* External instantiation is not allowed.
*/
TaskFactory();
static TaskFactory* factoryInstance;
};
#endif /* FSFW_TASKS_TASKFACTORY_H_ */