Subversion Repositories openrisc_2011-10-31

/*  Task_1

 *

 *  This routine serves as a test task.  It verifies the basic task

 *  switching capabilities of the executive.

 *

 *  Input parameters:

 *    argument - task argument

 *

 *  Output parameters:  NONE

 *

 *  COPYRIGHT (c) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  $Id: task.c,v 1.2 2001-09-27 12:02:24 chris Exp $

 */

#include "system.h"

#include <time.h>

#include <sched.h>

void diff_timespec(

  struct timespec *start,

  struct timespec *stop,

  struct timespec *result

)

{

   int nsecs_per_sec = 1000000000;

   result->tv_sec = stop->tv_sec - start->tv_sec;

   if ( stop->tv_nsec < start->tv_nsec ) {

      result->tv_nsec = nsecs_per_sec - start->tv_nsec + stop->tv_nsec;

      result->tv_sec--;

   } else

      result->tv_nsec = stop->tv_nsec - start->tv_nsec;

}

void *Task_1(

  void *argument

)

{

  int status;

  struct timespec start;

  struct timespec current;

  struct timespec difference;

  struct timespec delay;

  status = clock_gettime( CLOCK_REALTIME, &start );

  assert( !status );

  status = sched_rr_get_interval( getpid(), &delay );

  assert( !status );

  /* double the rr interval for confidence */

  delay.tv_sec *= 2;

  delay.tv_nsec *= 2;

  if ( delay.tv_nsec >= 1000000000 ) {   /* handle overflow/carry */

    delay.tv_nsec -= 1000000000;

    delay.tv_sec++;

  }

  puts( "Task_1: killing time" );

  for ( ; ; ) {

    status = clock_gettime( CLOCK_REALTIME, &current );

    assert( !status );

    diff_timespec( &start, &current, &difference );

    if ( difference.tv_sec < delay.tv_sec )

      continue;

    if ( difference.tv_sec > delay.tv_sec )

      break;

    if ( difference.tv_nsec > delay.tv_nsec )

      break;

  }

  puts( "Task_1: exitting" );

  pthread_exit( NULL );

  return NULL; /* just so the compiler thinks we returned something */

}