Aperiodic and periodic task

[joel at OARcorp.com (joel at OARcorp.com)]

On Fri, 6 Aug 1999 king at syscon.soongsil.ac.kr wrote:

> Hello.
> I wanna know scheduling concept of RTEMS running aperiodic and periodic task(rate monotonic).

Periodic tasks are constructed using the Rate Monotonic Manager like this
example from the User's manual:

rtems_task Periodic_task()
    {
      rtems_name        name;
      rtems_id          period;
      rtems_status_code status;

      name = rtems_build_name( 'P', 'E', 'R', 'D' );

      (void) rate_monotonic_create( name, &period );

      while ( 1 ) {
        if ( rate_monotonic_period( period, 100 ) == TIMEOUT )
          break;

        /* Perform some periodic actions */
      }

      /* missed period so delete period and SELF */

      (void) rate_monotonic_delete( period );
      (void) task_delete( SELF );
    }

--joel
Joel Sherrill, Ph.D.             Director of Research & Development
joel at OARcorp.com                 On-Line Applications Research
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