forked from Imagelibrary/rtems
120 lines
3.2 KiB
C
120 lines
3.2 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/**
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* @file
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*
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* 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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/*
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* COPYRIGHT (c) 1989-2012.
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* On-Line Applications Research Corporation (OAR).
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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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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/* forward declarations to avoid warnings */
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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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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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const long 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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rtems_test_assert( !status );
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status = sched_rr_get_interval( getpid(), &delay );
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rtems_test_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, ¤t );
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rtems_test_assert( !status );
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diff_timespec( &start, ¤t, &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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