fsfw/osal/host/PeriodicTask.h
2020-09-05 20:18:52 +02:00

124 lines
3.8 KiB
C++

#ifndef FRAMEWORK_OSAL_HOST_PERIODICTASK_H_
#define FRAMEWORK_OSAL_HOST_PERIODICTASK_H_
#include "../../objectmanager/ObjectManagerIF.h"
#include "../../tasks/PeriodicTaskIF.h"
#include "../../tasks/Typedef.h"
#include <vector>
#include <thread>
#include <condition_variable>
#include <atomic>
class ExecutableObjectIF;
/**
* @brief This class represents a specialized task for
* periodic activities of multiple objects.
* @details
*
* @ingroup task_handling
*/
class PeriodicTask: public PeriodicTaskIF {
public:
/**
* @brief Standard constructor of the class.
* @details
* The class is initialized without allocated objects. These need to be
* added with #addComponent.
* @param priority
* @param stack_size
* @param setPeriod
* @param setDeadlineMissedFunc
* The function pointer to the deadline missed function that shall be
* assigned.
*/
PeriodicTask(const char *name, TaskPriority setPriority, TaskStackSize setStack,
TaskPeriod setPeriod,void (*setDeadlineMissedFunc)());
/**
* @brief Currently, the executed object's lifetime is not coupled with
* the task object's lifetime, so the destructor is empty.
*/
virtual ~PeriodicTask(void);
/**
* @brief The method to start the task.
* @details The method starts the task with the respective system call.
* Entry point is the taskEntryPoint method described below.
* The address of the task object is passed as an argument
* to the system call.
*/
ReturnValue_t startTask(void);
/**
* Adds an object to the list of objects to be executed.
* The objects are executed in the order added.
* @param object Id of the object to add.
* @return
* -@c RETURN_OK on success
* -@c RETURN_FAILED if the object could not be added.
*/
ReturnValue_t addComponent(object_id_t object);
uint32_t getPeriodMs() const;
ReturnValue_t sleepFor(uint32_t ms);
protected:
using chron_ms = std::chrono::milliseconds;
bool started;
//!< Typedef for the List of objects.
typedef std::vector<ExecutableObjectIF*> ObjectList;
std::thread mainThread;
std::atomic<bool> terminateThread = false;
/**
* @brief This attribute holds a list of objects to be executed.
*/
ObjectList objectList;
std::condition_variable initCondition;
std::mutex initMutex;
std::string taskName;
/**
* @brief The period of the task.
* @details
* The period determines the frequency of the task's execution.
* It is expressed in clock ticks.
*/
TaskPeriod period;
/**
* @brief The pointer to the deadline-missed function.
* @details
* This pointer stores the function that is executed if the task's deadline
* is missed. So, each may react individually on a timing failure.
* The pointer may be NULL, then nothing happens on missing the deadline.
* The deadline is equal to the next execution of the periodic task.
*/
void (*deadlineMissedFunc)(void);
/**
* @brief This is the function executed in the new task's context.
* @details
* It converts the argument back to the thread object type and copies the
* class instance to the task context.
* The taskFunctionality method is called afterwards.
* @param A pointer to the task object itself is passed as argument.
*/
void taskEntryPoint(void* argument);
/**
* @brief The function containing the actual functionality of the task.
* @details
* The method sets and starts the task's period, then enters a loop that is
* repeated as long as the isRunning attribute is true. Within the loop,
* all performOperation methods of the added objects are called. Afterwards
* the checkAndRestartPeriod system call blocks the task until the next
* period. On missing the deadline, the deadlineMissedFunction is executed.
*/
void taskFunctionality(void);
bool delayForInterval(chron_ms * previousWakeTimeMs,
const chron_ms interval);
};
#endif /* PERIODICTASK_H_ */