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/**
* @file
*
* @brief Function sets scheduling policy and parameters of the thread
* @ingroup POSIXAPI
*/
/*
* 13.5.2 Dynamic Thread Scheduling Parameters Access,
* P1003.1c/Draft 10, p. 124
*/
/* COPYRIGHT (c) 1989-2014.
* 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.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <pthread.h>
#include <errno.h>
#include <rtems/posix/pthreadimpl.h>
#include <rtems/posix/priorityimpl.h>
#include <rtems/score/threadimpl.h>
#include <rtems/score/schedulerimpl.h>
typedef struct {
int policy;
const struct sched_param *param;
Thread_CPU_budget_algorithms budget_algorithm;
Thread_CPU_budget_algorithm_callout budget_callout;
int error;
} POSIX_Set_sched_param_context;
static bool _POSIX_Set_sched_param_filter(
Thread_Control *the_thread,
Priority_Control *new_priority_p,
void *arg
)
{
POSIX_Set_sched_param_context *context;
const struct sched_param *param;
const Scheduler_Control *scheduler;
POSIX_API_Control *api;
int low_prio;
int high_prio;
bool valid;
Priority_Control core_low_prio;
Priority_Control core_high_prio;
Priority_Control current_priority;
context = arg;
param = context->param;
scheduler = _Scheduler_Get_own( the_thread );
if ( context->policy == SCHED_SPORADIC ) {
low_prio = param->sched_ss_low_priority;
high_prio = param->sched_priority;
} else {
low_prio = param->sched_priority;
high_prio = low_prio;
}
core_low_prio = _POSIX_Priority_To_core( scheduler, low_prio, &valid );
if ( !valid ) {
context->error = EINVAL;
return false;
}
core_high_prio = _POSIX_Priority_To_core( scheduler, high_prio, &valid );
if ( !valid ) {
context->error = EINVAL;
return false;
}
*new_priority_p = core_high_prio;
current_priority = the_thread->current_priority;
the_thread->real_priority = core_high_prio;
api = the_thread->API_Extensions[ THREAD_API_POSIX ];
_Watchdog_Per_CPU_remove_relative( &api->Sporadic.Timer );
api->Attributes.schedpolicy = context->policy;
api->Attributes.schedparam = *param;
api->Sporadic.low_priority = core_low_prio;
api->Sporadic.high_priority = core_high_prio;
the_thread->budget_algorithm = context->budget_algorithm;
the_thread->budget_callout = context->budget_callout;
if ( context->policy == SCHED_SPORADIC ) {
_POSIX_Threads_Sporadic_timer_insert( the_thread, api );
} else {
the_thread->cpu_time_budget =
rtems_configuration_get_ticks_per_timeslice();
}
context->error = 0;
return _Thread_Priority_less_than( current_priority, core_high_prio )
|| !_Thread_Owns_resources( the_thread );
}
int pthread_setschedparam(
pthread_t thread,
int policy,
struct sched_param *param
)
{
Thread_Control *the_thread;
Per_CPU_Control *cpu_self;
POSIX_Set_sched_param_context context;
ISR_lock_Context lock_context;
int error;
if ( param == NULL ) {
return EINVAL;
}
error = _POSIX_Thread_Translate_sched_param(
policy,
param,
&context.budget_algorithm,
&context.budget_callout
);
if ( error != 0 ) {
return error;
}
context.policy = policy;
context.param = param;
the_thread = _Thread_Get( thread, &lock_context );
if ( the_thread == NULL ) {
return ESRCH;
}
cpu_self = _Thread_Dispatch_disable_critical( &lock_context );
_ISR_lock_ISR_enable( &lock_context );
_Thread_Change_priority(
the_thread,
0,
&context,
_POSIX_Set_sched_param_filter,
false
);
_Thread_Dispatch_enable( cpu_self );
return context.error;
}
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