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/*
* 13.5.2 Dynamic Thread Scheduling Parameters Access,
* P1003.1c/Draft 10, p. 124
*
* 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.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <pthread.h>
#include <errno.h>
#include <rtems/system.h>
#include <rtems/posix/pthread.h>
#include <rtems/posix/priority.h>
#include <rtems/posix/time.h>
int pthread_setschedparam(
pthread_t thread,
int policy,
struct sched_param *param
)
{
register Thread_Control *the_thread;
POSIX_API_Control *api;
Thread_CPU_budget_algorithms budget_algorithm;
Thread_CPU_budget_algorithm_callout budget_callout;
Objects_Locations location;
/*
* Check all the parameters
*/
if ( !param )
return EINVAL;
if ( !_POSIX_Priority_Is_valid( param->sched_priority ) )
return EINVAL;
budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_NONE;
budget_callout = NULL;
switch ( policy ) {
case SCHED_OTHER:
budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE;
break;
case SCHED_FIFO:
budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_NONE;
break;
case SCHED_RR:
budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_EXHAUST_TIMESLICE;
break;
case SCHED_SPORADIC:
budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_CALLOUT;
budget_callout = _POSIX_Threads_Sporadic_budget_callout;
if ( _POSIX_Timespec_to_interval( ¶m->ss_replenish_period ) <
_POSIX_Timespec_to_interval( ¶m->ss_initial_budget ) )
return EINVAL;
if ( !_POSIX_Priority_Is_valid( param->ss_low_priority ) )
return EINVAL;
break;
default:
return EINVAL;
}
/*
* Actually change the scheduling policy and parameters
*/
the_thread = _POSIX_Threads_Get( thread, &location );
switch ( location ) {
case OBJECTS_ERROR:
case OBJECTS_REMOTE:
return ESRCH;
case OBJECTS_LOCAL:
api = the_thread->API_Extensions[ THREAD_API_POSIX ];
if ( api->schedpolicy == SCHED_SPORADIC )
(void) _Watchdog_Remove( &api->Sporadic_timer );
api->schedpolicy = policy;
api->schedparam = *param;
the_thread->budget_algorithm = budget_algorithm;
the_thread->budget_callout = budget_callout;
switch ( api->schedpolicy ) {
case SCHED_OTHER:
case SCHED_FIFO:
case SCHED_RR:
the_thread->cpu_time_budget = _Thread_Ticks_per_timeslice;
the_thread->real_priority =
_POSIX_Priority_To_core( api->schedparam.sched_priority );
_Thread_Change_priority(
the_thread,
the_thread->real_priority,
TRUE
);
break;
case SCHED_SPORADIC:
api->ss_high_priority = api->schedparam.sched_priority;
_Watchdog_Remove( &api->Sporadic_timer );
_POSIX_Threads_Sporadic_budget_TSR( 0, the_thread );
break;
}
_Thread_Enable_dispatch();
return 0;
}
return POSIX_BOTTOM_REACHED();
}
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