cpukit/posix/src/psxtransschedparam.c


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/**
 * @file
 *
 * @ingroup POSIX_PTHREAD Private POSIX Threads
 *
 * @brief Translate sched_param into SuperCore Terms
 */

/*
 *  COPYRIGHT (c) 1989-2009.
 *  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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <pthread.h>
#include <errno.h>

#include <rtems/posix/pthreadimpl.h>

int _POSIX_Thread_Translate_to_sched_policy(
  Thread_CPU_budget_algorithms budget_algorithm
)
{
  switch ( budget_algorithm ) {
    case THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE:
      return SCHED_OTHER;
    case THREAD_CPU_BUDGET_ALGORITHM_EXHAUST_TIMESLICE:
      return SCHED_RR;
    case THREAD_CPU_BUDGET_ALGORITHM_CALLOUT:
      return SCHED_SPORADIC;
    default:
      _Assert( budget_algorithm == THREAD_CPU_BUDGET_ALGORITHM_NONE );
      return SCHED_FIFO;
  }
}

int _POSIX_Thread_Translate_sched_param(
  int                                  policy,
  const struct sched_param            *param,
  Thread_CPU_budget_algorithms        *budget_algorithm,
  Thread_CPU_budget_algorithm_callout *budget_callout
)
{
  *budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_NONE;
  *budget_callout = NULL;

  if ( policy == SCHED_OTHER ) {
    *budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE;
    return 0;
  }

  if ( policy == SCHED_FIFO ) {
    *budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_NONE;
    return 0;
  }

  if ( policy == SCHED_RR ) {
    *budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_EXHAUST_TIMESLICE;
    return 0;
  }

#if defined(RTEMS_POSIX_API)
  if ( policy == SCHED_SPORADIC ) {
    if ( (param->sched_ss_repl_period.tv_sec == 0) &&
         (param->sched_ss_repl_period.tv_nsec == 0) )
      return EINVAL;

    if ( (param->sched_ss_init_budget.tv_sec == 0) &&
         (param->sched_ss_init_budget.tv_nsec == 0) )
      return EINVAL;

    if ( _Timespec_To_ticks( &param->sched_ss_repl_period ) <
	 _Timespec_To_ticks( &param->sched_ss_init_budget ) )
      return EINVAL;

    *budget_algorithm  = THREAD_CPU_BUDGET_ALGORITHM_CALLOUT;
    *budget_callout = _POSIX_Threads_Sporadic_budget_callout;
    return 0;
  }
#endif

  return EINVAL;
}