/*
* 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.
*
* $Id$
*/
#define CONFIGURE_INIT
#include "system.h"
#include <errno.h>
void print_schedparam(
char *prefix,
struct sched_param *schedparam
)
{
printf( "%ssched priority = %d\n", prefix, schedparam->sched_priority );
#if defined(_POSIX_SPORADIC_SERVER)
printf( "%sss_low_priority = %d\n", prefix, schedparam->ss_low_priority );
printf( "%sss_replenish_period = (%ld, %ld)\n", prefix,
schedparam->ss_replenish_period.tv_sec,
schedparam->ss_replenish_period.tv_nsec );
printf( "%sss_initial_budget = (%ld, %ld)\n", prefix,
schedparam->ss_initial_budget.tv_sec,
schedparam->ss_initial_budget.tv_nsec );
#else
printf( "%s_POSIX_SPORADIC_SERVER is not defined\n" );
#endif
}
void *POSIX_Init(
void *argument
)
{
int status;
int passes;
int schedpolicy;
int priority;
struct sched_param schedparam;
char buffer[ 80 ];
pthread_mutexattr_t attr;
puts( "\n\n*** POSIX TEST 9 ***" );
/* set the time of day, and print our buffer in multiple ways */
set_time( TM_FRIDAY, TM_MAY, 24, 96, 11, 5, 0 );
/* get id of this thread */
Init_id = pthread_self();
printf( "Init's ID is 0x%08x\n", Init_id );
/* try to use this thread as a sporadic server */
puts( "Init: pthread_getschedparam - SUCCESSFUL" );
status = pthread_getschedparam( pthread_self(), &schedpolicy, &schedparam );
assert( !status );
priority = schedparam.sched_priority;
sprintf( buffer, " - current priority = %d", priority );
print_current_time( "Init: ", buffer );
schedparam.ss_replenish_period.tv_sec = 0;
schedparam.ss_replenish_period.tv_nsec = 500000000; /* 1/2 second */
schedparam.ss_initial_budget.tv_sec = 0;
schedparam.ss_initial_budget.tv_nsec = 250000000; /* 1/4 second */
schedparam.sched_priority = 200;
schedparam.ss_low_priority = 100;
puts( "Init: pthread_setschedparam - SUCCESSFUL (sporadic server)" );
status = pthread_setschedparam( pthread_self(), SCHED_SPORADIC, &schedparam );
assert( !status );
status = pthread_getschedparam( pthread_self(), &schedpolicy, &schedparam );
assert( !status );
priority = schedparam.sched_priority;
sprintf( buffer, " - new priority = %d", priority );
print_current_time( "Init: ", buffer );
/* go into a loop consuming CPU time to watch our priority change */
for ( passes=0 ; passes <= 3 ; ) {
status = pthread_getschedparam( pthread_self(), &schedpolicy, &schedparam );
assert( !status );
if ( priority != schedparam.sched_priority ) {
priority = schedparam.sched_priority;
sprintf( buffer, " - new priority = %d", priority );
print_current_time( "Init: ", buffer );
passes++;
}
}
/* now see if this works if we are holding a priority ceiling mutex */
empty_line();
status = pthread_getschedparam( pthread_self(), &schedpolicy, &schedparam );
assert( !status );
schedparam.ss_replenish_period.tv_sec = 0;
schedparam.ss_replenish_period.tv_nsec = 500000000; /* 1/2 second */
schedparam.ss_initial_budget.tv_sec = 0;
schedparam.ss_initial_budget.tv_nsec = 250000000; /* 1/4 second */
#define HIGH_PRIORITY 150
#define MEDIUM_PRIORITY 131
#define LOW_PRIORITY 100
schedparam.sched_priority = HIGH_PRIORITY;
schedparam.ss_low_priority = LOW_PRIORITY;
puts( "Init: pthread_setschedparam - SUCCESSFUL (sporadic server)" );
status = pthread_setschedparam( pthread_self(), SCHED_SPORADIC, &schedparam );
assert( !status );
puts( "Init: Initializing mutex attributes for priority ceiling" );
status = pthread_mutexattr_init( &attr );
assert( !status );
status = pthread_mutexattr_setprotocol( &attr, PTHREAD_PRIO_PROTECT );
assert( !status );
status = pthread_mutexattr_setprioceiling( &attr, MEDIUM_PRIORITY );
assert( !status );
puts( "Init: Creating a mutex" );
status = pthread_mutex_init( &Mutex_id, &attr );
if ( status )
printf( "status = %d\n", status );
assert( !status );
status = pthread_getschedparam( pthread_self(), &schedpolicy, &schedparam );
assert( !status );
priority = schedparam.sched_priority;
sprintf( buffer, " - new priority = %d", priority );
print_current_time( "Init: ", buffer );
/* go into a loop consuming CPU time to watch our priority lower */
for ( ; ; ) {
status = pthread_getschedparam( pthread_self(), &schedpolicy, &schedparam );
assert( !status );
if ( schedparam.sched_priority != LOW_PRIORITY )
continue;
priority = schedparam.sched_priority;
sprintf( buffer, " - new priority = %d", priority );
print_current_time( "Init: ", buffer );
puts( "Init: pthread_mutex_lock acquire the lock" );
status = pthread_mutex_lock( &Mutex_id );
if ( status )
printf( "status = %d\n", status );
assert( !status );
status = pthread_getschedparam( pthread_self(), &schedpolicy, &schedparam );
assert( !status );
priority = schedparam.sched_priority;
sprintf( buffer, " - new priority = %d", priority );
print_current_time( "Init: ", buffer );
break;
}
/* now spin waiting for our budget to be replenished */
for ( ; ; ) {
status = pthread_getschedparam( pthread_self(), &schedpolicy, &schedparam );
assert( !status );
if ( schedparam.sched_priority == HIGH_PRIORITY )
break;
}
priority = schedparam.sched_priority;
sprintf( buffer, " - new priority = %d", priority );
print_current_time( "Init: ", buffer );
/* with this unlock we should be able to go to low priority */
puts( "Init: unlock mutex" );
status = pthread_mutex_unlock( &Mutex_id );
if ( status )
printf( "status = %d\n", status );
assert( !status );
status = pthread_getschedparam( pthread_self(), &schedpolicy, &schedparam );
assert( !status );
priority = schedparam.sched_priority;
sprintf( buffer, " - new priority = %d", priority );
print_current_time( "Init: ", buffer );
for ( ; ; ) {
status = pthread_getschedparam( pthread_self(), &schedpolicy, &schedparam );
assert( !status );
if ( schedparam.sched_priority == LOW_PRIORITY )
break;
}
status = pthread_getschedparam( pthread_self(), &schedpolicy, &schedparam );
assert( !status );
priority = schedparam.sched_priority;
sprintf( buffer, " - new priority = %d", priority );
print_current_time( "Init: ", buffer );
puts( "*** END OF POSIX TEST 9 ***" );
exit( 0 );
return NULL; /* just so the compiler thinks we returned something */
}
