1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup RTEMSImplClassicSemaphore |
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5 | * |
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6 | * @brief This source file contains the implementation of |
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7 | * rtems_semaphore_set_priority(). |
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8 | */ |
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9 | |
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10 | /* |
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11 | * Copyright (c) 2014 embedded brains GmbH. All rights reserved. |
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12 | * |
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13 | * embedded brains GmbH |
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14 | * Dornierstr. 4 |
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15 | * 82178 Puchheim |
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16 | * Germany |
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17 | * <rtems@embedded-brains.de> |
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18 | * |
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19 | * The license and distribution terms for this file may be |
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20 | * found in the file LICENSE in this distribution or at |
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21 | * http://www.rtems.org/license/LICENSE. |
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22 | */ |
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23 | |
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24 | #ifdef HAVE_CONFIG_H |
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25 | #include "config.h" |
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26 | #endif |
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27 | |
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28 | #include <rtems/rtems/semimpl.h> |
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29 | #include <rtems/rtems/tasksimpl.h> |
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30 | #include <rtems/score/schedulerimpl.h> |
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31 | |
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32 | static rtems_status_code _Semaphore_Is_scheduler_valid( |
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33 | const CORE_ceiling_mutex_Control *the_mutex, |
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34 | const Scheduler_Control *scheduler |
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35 | ) |
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36 | { |
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37 | #if defined(RTEMS_SMP) |
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38 | if ( scheduler != _CORE_ceiling_mutex_Get_scheduler( the_mutex ) ) { |
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39 | return RTEMS_NOT_DEFINED; |
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40 | } |
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41 | #endif |
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42 | |
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43 | return RTEMS_SUCCESSFUL; |
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44 | } |
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45 | |
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46 | static rtems_status_code _Semaphore_Set_priority( |
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47 | Semaphore_Control *the_semaphore, |
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48 | const Scheduler_Control *scheduler, |
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49 | rtems_task_priority new_priority, |
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50 | rtems_task_priority *old_priority_p, |
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51 | Thread_queue_Context *queue_context |
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52 | ) |
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53 | { |
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54 | rtems_status_code sc; |
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55 | bool valid; |
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56 | Priority_Control core_priority; |
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57 | Priority_Control old_priority; |
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58 | Per_CPU_Control *cpu_self; |
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59 | Semaphore_Variant variant; |
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60 | |
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61 | core_priority = _RTEMS_Priority_To_core( scheduler, new_priority, &valid ); |
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62 | if ( new_priority != RTEMS_CURRENT_PRIORITY && !valid ) { |
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63 | _ISR_lock_ISR_enable( &queue_context->Lock_context.Lock_context ); |
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64 | return RTEMS_INVALID_PRIORITY; |
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65 | } |
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66 | |
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67 | _Thread_queue_Context_clear_priority_updates( queue_context ); |
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68 | _Thread_queue_Acquire_critical( |
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69 | &the_semaphore->Core_control.Wait_queue, |
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70 | queue_context |
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71 | ); |
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72 | variant = _Semaphore_Get_variant( _Semaphore_Get_flags( the_semaphore ) ); |
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73 | |
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74 | switch ( variant ) { |
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75 | case SEMAPHORE_VARIANT_MUTEX_PRIORITY_CEILING: |
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76 | sc = _Semaphore_Is_scheduler_valid( |
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77 | &the_semaphore->Core_control.Mutex, |
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78 | scheduler |
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79 | ); |
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80 | |
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81 | old_priority = _CORE_ceiling_mutex_Get_priority( |
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82 | &the_semaphore->Core_control.Mutex |
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83 | ); |
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84 | |
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85 | if ( sc == RTEMS_SUCCESSFUL && new_priority != RTEMS_CURRENT_PRIORITY ) { |
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86 | _CORE_ceiling_mutex_Set_priority( |
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87 | &the_semaphore->Core_control.Mutex, |
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88 | core_priority, |
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89 | queue_context |
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90 | ); |
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91 | } |
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92 | |
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93 | break; |
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94 | #if defined(RTEMS_SMP) |
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95 | case SEMAPHORE_VARIANT_MRSP: |
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96 | old_priority = _MRSP_Get_priority( |
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97 | &the_semaphore->Core_control.MRSP, |
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98 | scheduler |
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99 | ); |
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100 | |
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101 | if ( new_priority != RTEMS_CURRENT_PRIORITY ) { |
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102 | _MRSP_Set_priority( |
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103 | &the_semaphore->Core_control.MRSP, |
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104 | scheduler, |
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105 | core_priority |
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106 | ); |
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107 | } |
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108 | |
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109 | sc = RTEMS_SUCCESSFUL; |
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110 | break; |
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111 | #endif |
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112 | default: |
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113 | _Assert( |
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114 | variant == SEMAPHORE_VARIANT_MUTEX_INHERIT_PRIORITY |
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115 | || variant == SEMAPHORE_VARIANT_MUTEX_NO_PROTOCOL |
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116 | || variant == SEMAPHORE_VARIANT_SIMPLE_BINARY |
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117 | || variant == SEMAPHORE_VARIANT_COUNTING |
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118 | ); |
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119 | old_priority = 0; |
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120 | sc = RTEMS_NOT_DEFINED; |
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121 | break; |
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122 | } |
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123 | |
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124 | cpu_self = _Thread_queue_Dispatch_disable( queue_context ); |
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125 | _Thread_queue_Release( |
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126 | &the_semaphore->Core_control.Wait_queue, |
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127 | queue_context |
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128 | ); |
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129 | _Thread_Priority_update( queue_context ); |
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130 | _Thread_Dispatch_enable( cpu_self ); |
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131 | |
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132 | *old_priority_p = _RTEMS_Priority_From_core( scheduler, old_priority ); |
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133 | return sc; |
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134 | } |
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135 | |
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136 | rtems_status_code rtems_semaphore_set_priority( |
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137 | rtems_id semaphore_id, |
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138 | rtems_id scheduler_id, |
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139 | rtems_task_priority new_priority, |
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140 | rtems_task_priority *old_priority |
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141 | ) |
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142 | { |
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143 | const Scheduler_Control *scheduler; |
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144 | Semaphore_Control *the_semaphore; |
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145 | Thread_queue_Context queue_context; |
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146 | |
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147 | if ( old_priority == NULL ) { |
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148 | return RTEMS_INVALID_ADDRESS; |
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149 | } |
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150 | |
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151 | scheduler = _Scheduler_Get_by_id( scheduler_id ); |
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152 | if ( scheduler == NULL ) { |
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153 | return RTEMS_INVALID_ID; |
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154 | } |
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155 | |
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156 | the_semaphore = _Semaphore_Get( semaphore_id, &queue_context ); |
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157 | |
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158 | if ( the_semaphore == NULL ) { |
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159 | #if defined(RTEMS_MULTIPROCESSING) |
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160 | if ( _Semaphore_MP_Is_remote( semaphore_id ) ) { |
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161 | return RTEMS_ILLEGAL_ON_REMOTE_OBJECT; |
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162 | } |
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163 | #endif |
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164 | |
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165 | return RTEMS_INVALID_ID; |
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166 | } |
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167 | |
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168 | return _Semaphore_Set_priority( |
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169 | the_semaphore, |
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170 | scheduler, |
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171 | new_priority, |
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172 | old_priority, |
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173 | &queue_context |
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174 | ); |
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175 | } |
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