posix/src/psxtransschedparam.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup POSIX_PTHREAD Private POSIX Threads
0007  *
0008  * @brief Translate sched_param into SuperCore Terms
0009  */
0010
0011 /*
0012  *  COPYRIGHT (c) 1989-2009.
0013  *  On-Line Applications Research Corporation (OAR).
0014  *
0015  * Redistribution and use in source and binary forms, with or without
0016  * modification, are permitted provided that the following conditions
0017  * are met:
0018  * 1. Redistributions of source code must retain the above copyright
0019  *    notice, this list of conditions and the following disclaimer.
0020  * 2. Redistributions in binary form must reproduce the above copyright
0021  *    notice, this list of conditions and the following disclaimer in the
0022  *    documentation and/or other materials provided with the distribution.
0023  *
0024  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0025  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0026  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0027  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0028  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0029  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0030  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0031  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0032  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0033  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0034  * POSSIBILITY OF SUCH DAMAGE.
0035  */
0036
0037 #ifdef HAVE_CONFIG_H
0038 #include "config.h"
0039 #endif
0040
0041 #include <pthread.h>
0042 #include <errno.h>
0043
0044 #include <rtems/posix/pthreadimpl.h>
0045 #include <rtems/score/threadcpubudget.h>
0046
0047 int _POSIX_Thread_Translate_to_sched_policy(
0048   const Thread_CPU_budget_operations *operations
0049 )
0050 {
0051   if ( operations == NULL ) {
0052     return SCHED_FIFO;
0053   }
0054
0055   if ( operations == &_Thread_CPU_budget_exhaust_timeslice ) {
0056     return SCHED_RR;
0057   }
0058
0059 #if defined(RTEMS_POSIX_API)
0060   if ( operations == &_POSIX_Threads_Sporadic_budget ) {
0061     return SCHED_SPORADIC;
0062   }
0063 #endif
0064
0065   return SCHED_OTHER;
0066 }
0067
0068 int _POSIX_Thread_Translate_sched_param(
0069   int                       policy,
0070   const struct sched_param *param,
0071   Thread_Configuration     *config
0072 )
0073 {
0074   config->cpu_budget_operations = NULL;
0075
0076   if ( policy == SCHED_FIFO ) {
0077     return 0;
0078   }
0079
0080   if ( policy == SCHED_OTHER ) {
0081     config->cpu_budget_operations = &_Thread_CPU_budget_reset_timeslice;
0082     return 0;
0083   }
0084
0085   if ( policy == SCHED_RR ) {
0086     config->cpu_budget_operations = &_Thread_CPU_budget_exhaust_timeslice;
0087     return 0;
0088   }
0089
0090 #if defined(RTEMS_POSIX_API)
0091   if ( policy == SCHED_SPORADIC ) {
0092     if ( (param->sched_ss_repl_period.tv_sec == 0) &&
0093          (param->sched_ss_repl_period.tv_nsec == 0) )
0094       return EINVAL;
0095
0096     if ( (param->sched_ss_init_budget.tv_sec == 0) &&
0097          (param->sched_ss_init_budget.tv_nsec == 0) )
0098       return EINVAL;
0099
0100     if ( _Timespec_To_ticks( &param->sched_ss_repl_period ) <
0101      _Timespec_To_ticks( &param->sched_ss_init_budget ) )
0102       return EINVAL;
0103
0104     config->cpu_budget_operations = &_POSIX_Threads_Sporadic_budget;
0105     return 0;
0106   }
0107 #endif
0108
0109   return EINVAL;
0110 }