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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [tests/] [psxtests/] [psx11/] [task.c] - Rev 30
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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: 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, ¤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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