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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [tests/] [psxtests/] [psx11/] [task.c] - Blame information for rev 864

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Line No. Rev Author Line
1 30 unneback
/*  Task_1
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 *
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 *  This routine serves as a test task.  It verifies the basic task
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 *  switching capabilities of the executive.
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 *
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 *  Input parameters:
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 *    argument - task argument
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 *
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 *  Output parameters:  NONE
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 *
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 *  COPYRIGHT (c) 1989-1999.
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 *  On-Line Applications Research Corporation (OAR).
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 *
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 *  The license and distribution terms for this file may be
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 *  found in the file LICENSE in this distribution or at
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 *  http://www.OARcorp.com/rtems/license.html.
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 *
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 *  $Id: task.c,v 1.2 2001-09-27 12:02:24 chris Exp $
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 */
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#include "system.h"
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#include <time.h>
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#include <sched.h>
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void diff_timespec(
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  struct timespec *start,
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  struct timespec *stop,
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  struct timespec *result
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)
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{
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   int nsecs_per_sec = 1000000000;
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   result->tv_sec = stop->tv_sec - start->tv_sec;
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   if ( stop->tv_nsec < start->tv_nsec ) {
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      result->tv_nsec = nsecs_per_sec - start->tv_nsec + stop->tv_nsec;
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      result->tv_sec--;
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   } else
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      result->tv_nsec = stop->tv_nsec - start->tv_nsec;
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}
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void *Task_1(
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  void *argument
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)
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{
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  int status;
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  struct timespec start;
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  struct timespec current;
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  struct timespec difference;
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  struct timespec delay;
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  status = clock_gettime( CLOCK_REALTIME, &start );
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  assert( !status );
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  status = sched_rr_get_interval( getpid(), &delay );
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  assert( !status );
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  /* double the rr interval for confidence */
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  delay.tv_sec *= 2;
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  delay.tv_nsec *= 2;
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  if ( delay.tv_nsec >= 1000000000 ) {   /* handle overflow/carry */
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    delay.tv_nsec -= 1000000000;
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    delay.tv_sec++;
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  }
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  puts( "Task_1: killing time" );
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  for ( ; ; ) {
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    status = clock_gettime( CLOCK_REALTIME, &current );
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    assert( !status );
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    diff_timespec( &start, &current, &difference );
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    if ( difference.tv_sec < delay.tv_sec )
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      continue;
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    if ( difference.tv_sec > delay.tv_sec )
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      break;
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    if ( difference.tv_nsec > delay.tv_nsec )
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      break;
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  }
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  puts( "Task_1: exitting" );
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  pthread_exit( NULL );
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  return NULL; /* just so the compiler thinks we returned something */
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}

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