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/* 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.
*
* $Id$
*/
#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, ¤t );
assert( !status );
diff_timespec( &start, ¤t, &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 */
}
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