#include <string.h>
#include <stdio.h>
#include <pthread.h>
#include <unistd.h>

void* foo( void*p )
{
    int policy;
    struct sched_param param;
    if ( pthread_getschedparam( pthread_self(), &policy, &param ) == 0 )
        printf( "policy: %d priority: %d\n", policy, param.sched_priority );
}

int main()
{
    pthread_t p;
    struct sched_param param;
    pthread_attr_t attr;
    memset( &param, 0, sizeof( param ) );
    param.sched_priority = sched_get_priority_max( SCHED_FIFO );
#if 0
    if ( sched_setscheduler( 0, SCHED_FIFO, &param ) == 0 )
        printf( "succesfully selected FIFO scheduler\n" );
#endif
    printf( "max priority %d\n", param.sched_priority );
    if ( pthread_attr_init( &attr ) )
        printf( "problem attr init\n" );
    if ( pthread_attr_setschedpolicy( &attr, SCHED_FIFO ) )
        printf( "problem setschedpolicy\n" );
    pthread_attr_setscope( &attr, PTHREAD_SCOPE_SYSTEM );
    if ( pthread_attr_setschedparam( &attr, &param ) )
        printf( "problem setschedparam\n" );
    if ( pthread_create( &p, &attr, foo, 0 ) == 0 )
        printf( "thread succesfully created\n" );
    else
        printf( "problem creating thread\n" );
    pthread_attr_destroy( &attr );
    usleep( 1000000UL );
}