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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup POSIXAPI
*
* @brief Function sets scheduling policy and parameters of the thread
*/
/*
* 13.5.2 Dynamic Thread Scheduling Parameters Access,
* P1003.1c/Draft 10, p. 124
*/
/* COPYRIGHT (c) 1989-2014.
* On-Line Applications Research Corporation (OAR).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <pthread.h>
#include <string.h>
#include <errno.h>
#include <rtems/posix/pthreadimpl.h>
#include <rtems/posix/priorityimpl.h>
#include <rtems/score/threadimpl.h>
static int _POSIX_Set_sched_param(
Thread_Control *the_thread,
int policy,
const struct sched_param *param,
const Thread_Configuration *config,
Thread_queue_Context *queue_context
)
{
const Scheduler_Control *scheduler;
int normal_prio;
bool valid;
Priority_Control core_normal_prio;
const Thread_CPU_budget_operations *cpu_budget_operations;
#if defined(RTEMS_POSIX_API)
POSIX_API_Control *api;
int low_prio;
Priority_Control core_low_prio;
#endif
normal_prio = param->sched_priority;
scheduler = _Thread_Scheduler_get_home( the_thread );
core_normal_prio = _POSIX_Priority_To_core( scheduler, normal_prio, &valid );
if ( !valid ) {
return EINVAL;
}
#if defined(RTEMS_POSIX_API)
if ( policy == SCHED_SPORADIC ) {
low_prio = param->sched_ss_low_priority;
} else {
low_prio = normal_prio;
}
core_low_prio = _POSIX_Priority_To_core( scheduler, low_prio, &valid );
if ( !valid ) {
return EINVAL;
}
api = the_thread->API_Extensions[ THREAD_API_POSIX ];
_Watchdog_Per_CPU_remove_ticks( &api->Sporadic.Timer );
#endif
_Priority_Node_set_priority( &the_thread->Real_priority, core_normal_prio );
#if defined(RTEMS_POSIX_API)
if ( _Priority_Node_is_active( &api->Sporadic.Low_priority ) ) {
_Thread_Priority_add(
the_thread,
&the_thread->Real_priority,
queue_context
);
_Thread_Priority_remove(
the_thread,
&api->Sporadic.Low_priority,
queue_context
);
_Priority_Node_set_inactive( &api->Sporadic.Low_priority );
} else {
#endif
_Thread_Priority_changed(
the_thread,
&the_thread->Real_priority,
PRIORITY_GROUP_LAST,
queue_context
);
#if defined(RTEMS_POSIX_API)
}
#endif
cpu_budget_operations = config->cpu_budget_operations;
the_thread->CPU_budget.operations = cpu_budget_operations;
if ( cpu_budget_operations != NULL ) {
( *cpu_budget_operations->initialize )( the_thread );
}
#if defined(RTEMS_POSIX_API)
_Priority_Node_set_priority( &api->Sporadic.Low_priority, core_low_prio );
api->Sporadic.sched_ss_repl_period = param->sched_ss_repl_period;
api->Sporadic.sched_ss_init_budget = param->sched_ss_init_budget;
api->Sporadic.sched_ss_max_repl = param->sched_ss_max_repl;
if ( policy == SCHED_SPORADIC ) {
_POSIX_Threads_Sporadic_timer_insert( the_thread, api );
}
#endif
return 0;
}
int pthread_setschedparam(
pthread_t thread,
int policy,
#ifdef HAVE_PTHREAD_SETSCHEDPARAM_CONST
const struct sched_param *param
#else
struct sched_param *param
#endif
)
{
Thread_Configuration config;
Thread_Control *the_thread;
Per_CPU_Control *cpu_self;
Thread_queue_Context queue_context;
int error;
if ( param == NULL ) {
return EINVAL;
}
memset( &config, 0, sizeof( config ) );
error = _POSIX_Thread_Translate_sched_param( policy, param, &config );
if ( error != 0 ) {
return error;
}
_Thread_queue_Context_initialize( &queue_context );
_Thread_queue_Context_clear_priority_updates( &queue_context );
the_thread = _Thread_Get( thread, &queue_context.Lock_context.Lock_context );
if ( the_thread == NULL ) {
return ESRCH;
}
_Thread_Wait_acquire_critical( the_thread, &queue_context );
error = _POSIX_Set_sched_param(
the_thread,
policy,
param,
&config,
&queue_context
);
cpu_self = _Thread_queue_Dispatch_disable( &queue_context );
_Thread_Wait_release( the_thread, &queue_context );
_Thread_Priority_update( &queue_context );
_Thread_Dispatch_enable( cpu_self );
return error;
}
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