Scheduler for tasks

Implentation of Scheduler for tasks: More...

Functions
void	timer_new_task (TASK_S *task, void(*runFunction)(void))
	Create a task. More...
void	timer_start_task (TASK_S *task, void(*alertFunction)(int), int period_us)
	Start some task. More...
void	timer_stop_task (TASK_S *task)
	Stop some task. More...

Detailed Description

Implentation of Scheduler for tasks:

Author

Rafael Lima

Todo:

test it

Function Documentation

void timer_new_task	(	TASK_S *	task,
		void(*)(void)	runFunction
	)

Create a task.

Parameters

*task
*voidFunction	Pointer to the function called to execute

Definition at line 16 of file taskScheduler.c.

Referenced by main().

                                                           {
  (*task).t_global = 0.0;
  (*task).T_exec_global = 0.0;
  (*task).T_mean_global = 0.0;
  (*task).T_max_global = 0.0;
  (*task).period_us = 0.0;
  (*task).isFirstExecution = 1;

  (*task).run = runFunction;
}

Here is the caller graph for this function:

void timer_start_task	(	TASK_S *	task,
		void(*)(int)	alertFunction,
		int	period_us
	)

Start some task.

Parameters

*task	Struct whith task data
period_us	Period Value to repeat the task

Todo:

verify how use two tasks

Definition at line 27 of file taskScheduler.c.

References TASK_S::isFirstExecution, TASK_S::period_us, and TASK_S::timer.

Referenced by main().

                                                                            {
  struct itimerspec itimer;
  struct sigevent evp;
  int erno = 0;
  
  task->isFirstExecution = 1;
  task->period_us = period_us;

  /*evp.sigev_value.sival_ptr = &(task->timer);
  evp.sigev_notify = SIGEV_SIGNAL;
  evp.sigev_signo = SIGUSR1;*/

  //memset (&evp, 0, sizeof (struct sigevent));
  evp.sigev_value.sival_int = 0;
  evp.sigev_notify = SIGEV_THREAD;
  evp.sigev_notify_attributes = NULL;
  evp.sigev_notify_function = alertFunction;

  if(timer_create( CLOCK_REALTIME, &evp, &(task->timer))<0)
  {
    fprintf(stderr, "[%d]: %s\n", __LINE__, strerror(erno));
    exit(erno);
  }

  /*/ Signal handler configuration
  struct sigaction satimer;
  satimer.sa_handler = task->run;
  sigemptyset( &satimer.sa_mask );
  satimer.sa_flags = SA_RESTART;*/

  //if ( sigaction( SIGUSR1, &satimer, NULL ) < 0)
  if(timer_create(CLOCK_REALTIME, &evp, task->timer) < 0)
  {
    //printf( "ERROR: sigaction.\n" );
    fprintf(stderr, "[%d]: %s\n", __LINE__, strerror(erno));
    exit(erno);
  }

  itimer.it_interval.tv_sec = 0;
  itimer.it_interval.tv_nsec= task->period_us*1000;
  itimer.it_value = itimer.it_interval;

  if(timer_settime(task->timer,0,&itimer,NULL) < 0)
  {
    fprintf(stderr,"[%d]: %s\n", __LINE__, strerror(erno));
    exit(erno);
  }
}

Here is the caller graph for this function:

void timer_stop_task

(

TASK_S *

task

)

Stop some task.

Todo:

verify use of variable 'erno'

Definition at line 129 of file taskScheduler.c.

Referenced by main().

                                  {
  int erno = 0;
  if(timer_delete((*task).timer)<0){
    fprintf(stderr,"[%d]:%s\n",__LINE__,strerror(erno));
    exit(erno);
  }
}

Here is the caller graph for this function: