fsfw/osal/linux/PeriodicPosixTask.h

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2018-07-13 18:28:26 +02:00
#ifndef FRAMEWORK_OSAL_LINUX_PERIODICPOSIXTASK_H_
#define FRAMEWORK_OSAL_LINUX_PERIODICPOSIXTASK_H_
#include <framework/tasks/PeriodicTaskIF.h>
#include <framework/objectmanager/ObjectManagerIF.h>
#include <framework/osal/linux/PosixThread.h>
#include <framework/tasks/ExecutableObjectIF.h>
#include <vector>
class PeriodicPosixTask: public PosixThread, public PeriodicTaskIF {
public:
/**
* Create a generic periodic task.
* @param name_
* Name, maximum allowed size of linux is 16 chars, everything else will
* be truncated.
* @param priority_
* Real-time priority, ranges from 1 to 99 for Linux.
* See: https://man7.org/linux/man-pages/man7/sched.7.html
* @param stackSize_
* @param period_
* @param deadlineMissedFunc_
*/
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PeriodicPosixTask(const char* name_, int priority_, size_t stackSize_,
uint32_t period_, void(*deadlineMissedFunc_)());
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virtual ~PeriodicPosixTask();
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/**
* @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 RETURN_OK on success, 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);
private:
typedef std::vector<ExecutableObjectIF*> ObjectList; //!< Typedef for the List of objects.
/**
* @brief This attribute holds a list of objects to be executed.
*/
ObjectList objectList;
/**
* @brief Flag to indicate that the task was started and is allowed to run
*/
bool started;
/**
* @brief Period of the task in milliseconds
*/
uint32_t periodMs;
/**
* @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 indefinitely. Within the loop, all performOperation methods of the added
* objects are called. Afterwards the task will be blocked until the next period.
* On missing the deadline, the deadlineMissedFunction is executed.
*/
virtual void taskFunctionality(void);
/**
* @brief This is the entry point in a new thread.
*
* @details This method, that is the entry point in the new thread and calls taskFunctionality of the child class.
* Needs a valid pointer to the derived class.
*/
static void* taskEntryPoint(void* arg);
/**
* @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)();
};
#endif /* FRAMEWORK_OSAL_LINUX_PERIODICPOSIXTASK_H_ */