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/*
* Program to print POSIX Scheduler Characteristics
*/
/*
* Copyright 2018 Joel Sherrill (joel@rtems.org)
*
* This file's license is 2-clause BSD as in this distribution's LICENSE.2 file.
*/
#include <stdlib.h>
#include <stdio.h>
#include <sched.h>
/* FreeBSD 10 needs this for struct timespec which seems wrong */
#include <time.h>
void print_sched_info(
char *s,
int policy
)
{
int min, max, levels;
struct timespec t;
printf( "Information on %s\n", s );
min = sched_get_priority_min( policy );
max = sched_get_priority_max( policy );
(void) sched_rr_get_interval( 1, &t );
levels = abs(max - min + 1);
printf( "\tSupports %d priority levels (%d - %d)\n", levels, min, max );
if ( levels >= 32 )
printf( "\tImplementation is compliant on priority levels\n");
else
printf( "\tImplementation is NOT compliant on priority levels\n" );
printf( "\tScheduling quantum is %ld seconds and %ld nanoseconds\n",
(long)t.tv_sec, (long)t.tv_nsec );
puts( "" );
}
int main()
{
puts( "*** POSIX Scheduler Characteristics Report ***" );
print_sched_info( "SCHED_OTHER", SCHED_OTHER );
print_sched_info( "SCHED_FIFO", SCHED_FIFO );
print_sched_info( "SCHED_RR", SCHED_RR );
#if defined(SCHED_SPORADIC)
print_sched_info( "SCHED_SPORADIC", SCHED_SPORADIC );
#else
printf( "SCHED_SPORADIC is not supported\n" );
#endif
puts( "*** END OF POSIX Scheduler Characteristics Report ***" );
exit( 0 );
}
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