1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Translate sched_param into SuperCore Terms |
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5 | * @ingroup POSIX_PTHREAD Private POSIX Threads |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2009. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <pthread.h> |
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22 | #include <errno.h> |
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23 | |
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24 | #include <rtems/posix/pthreadimpl.h> |
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25 | |
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26 | int _POSIX_Thread_Translate_to_sched_policy( |
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27 | Thread_CPU_budget_algorithms budget_algorithm |
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28 | ) |
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29 | { |
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30 | switch ( budget_algorithm ) { |
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31 | case THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE: |
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32 | return SCHED_OTHER; |
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33 | case THREAD_CPU_BUDGET_ALGORITHM_EXHAUST_TIMESLICE: |
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34 | return SCHED_RR; |
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35 | case THREAD_CPU_BUDGET_ALGORITHM_CALLOUT: |
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36 | return SCHED_SPORADIC; |
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37 | default: |
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38 | _Assert( budget_algorithm == THREAD_CPU_BUDGET_ALGORITHM_NONE ); |
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39 | return SCHED_FIFO; |
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40 | } |
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41 | } |
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42 | |
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43 | int _POSIX_Thread_Translate_sched_param( |
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44 | int policy, |
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45 | const struct sched_param *param, |
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46 | Thread_CPU_budget_algorithms *budget_algorithm, |
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47 | Thread_CPU_budget_algorithm_callout *budget_callout |
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48 | ) |
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49 | { |
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50 | *budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_NONE; |
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51 | *budget_callout = NULL; |
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52 | |
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53 | if ( policy == SCHED_OTHER ) { |
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54 | *budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE; |
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55 | return 0; |
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56 | } |
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57 | |
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58 | if ( policy == SCHED_FIFO ) { |
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59 | *budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_NONE; |
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60 | return 0; |
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61 | } |
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62 | |
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63 | if ( policy == SCHED_RR ) { |
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64 | *budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_EXHAUST_TIMESLICE; |
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65 | return 0; |
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66 | } |
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67 | |
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68 | #if defined(RTEMS_POSIX_API) |
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69 | if ( policy == SCHED_SPORADIC ) { |
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70 | if ( (param->sched_ss_repl_period.tv_sec == 0) && |
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71 | (param->sched_ss_repl_period.tv_nsec == 0) ) |
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72 | return EINVAL; |
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73 | |
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74 | if ( (param->sched_ss_init_budget.tv_sec == 0) && |
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75 | (param->sched_ss_init_budget.tv_nsec == 0) ) |
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76 | return EINVAL; |
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77 | |
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78 | if ( _Timespec_To_ticks( ¶m->sched_ss_repl_period ) < |
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79 | _Timespec_To_ticks( ¶m->sched_ss_init_budget ) ) |
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80 | return EINVAL; |
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81 | |
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82 | *budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_CALLOUT; |
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83 | *budget_callout = _POSIX_Threads_Sporadic_budget_callout; |
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84 | return 0; |
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85 | } |
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86 | #endif |
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87 | |
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88 | return EINVAL; |
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89 | } |
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