1 | /* SPDX-License-Identifier: BSD-2-Clause */ |
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2 | |
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3 | /** |
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4 | * @file |
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5 | * |
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6 | * @ingroup RTEMSScoreMutex |
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7 | * |
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8 | * @brief This header file provides interfaces of the |
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9 | * @ref RTEMSScoreMutex which are only used by the implementation. |
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10 | */ |
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11 | |
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12 | /* |
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13 | * COPYRIGHT (c) 1989-2009. |
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14 | * On-Line Applications Research Corporation (OAR). |
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15 | * |
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16 | * Redistribution and use in source and binary forms, with or without |
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17 | * modification, are permitted provided that the following conditions |
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18 | * are met: |
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19 | * 1. Redistributions of source code must retain the above copyright |
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20 | * notice, this list of conditions and the following disclaimer. |
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21 | * 2. Redistributions in binary form must reproduce the above copyright |
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22 | * notice, this list of conditions and the following disclaimer in the |
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23 | * documentation and/or other materials provided with the distribution. |
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24 | * |
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25 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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26 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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27 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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28 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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29 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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30 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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31 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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32 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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33 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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34 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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35 | * POSSIBILITY OF SUCH DAMAGE. |
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36 | */ |
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37 | |
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38 | #ifndef _RTEMS_SCORE_COREMUTEXIMPL_H |
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39 | #define _RTEMS_SCORE_COREMUTEXIMPL_H |
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40 | |
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41 | #include <rtems/score/coremutex.h> |
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42 | #include <rtems/score/chainimpl.h> |
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43 | #include <rtems/score/schedulerimpl.h> |
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44 | #include <rtems/score/status.h> |
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45 | #include <rtems/score/threadimpl.h> |
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46 | #include <rtems/score/threadqimpl.h> |
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47 | |
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48 | #ifdef __cplusplus |
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49 | extern "C" { |
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50 | #endif |
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51 | |
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52 | /** |
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53 | * @addtogroup RTEMSScoreMutex |
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54 | * |
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55 | * @{ |
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56 | */ |
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57 | |
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58 | #define CORE_MUTEX_TQ_OPERATIONS &_Thread_queue_Operations_priority |
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59 | |
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60 | #define CORE_MUTEX_TQ_PRIORITY_INHERIT_OPERATIONS \ |
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61 | &_Thread_queue_Operations_priority_inherit |
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62 | |
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63 | /** |
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64 | * @brief Initializes the mutex. |
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65 | * |
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66 | * @param[out] the_mutex The mutex to initialize. |
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67 | */ |
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68 | static inline void _CORE_mutex_Initialize( |
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69 | CORE_mutex_Control *the_mutex |
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70 | ) |
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71 | { |
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72 | _Thread_queue_Object_initialize( &the_mutex->Wait_queue ); |
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73 | } |
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74 | |
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75 | /** |
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76 | * @brief Destroys the mutex. |
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77 | * |
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78 | * @param[out] the_mutex the mutex to destroy. |
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79 | */ |
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80 | static inline void _CORE_mutex_Destroy( CORE_mutex_Control *the_mutex ) |
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81 | { |
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82 | _Thread_queue_Destroy( &the_mutex->Wait_queue ); |
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83 | } |
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84 | |
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85 | /** |
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86 | * @brief Acquires the mutex critical. |
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87 | * |
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88 | * @param[in, out] the_mutex The mutex to acquire critical. |
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89 | * @param queue_context The queue context. |
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90 | */ |
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91 | static inline void _CORE_mutex_Acquire_critical( |
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92 | CORE_mutex_Control *the_mutex, |
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93 | Thread_queue_Context *queue_context |
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94 | ) |
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95 | { |
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96 | _Thread_queue_Acquire_critical( &the_mutex->Wait_queue, queue_context ); |
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97 | } |
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98 | |
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99 | /** |
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100 | * @brief Releases the mutex. |
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101 | * |
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102 | * @param[in, out] the_mutex The mutex to release. |
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103 | * @param queue_context The queue context. |
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104 | */ |
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105 | static inline void _CORE_mutex_Release( |
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106 | CORE_mutex_Control *the_mutex, |
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107 | Thread_queue_Context *queue_context |
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108 | ) |
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109 | { |
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110 | _Thread_queue_Release( &the_mutex->Wait_queue, queue_context ); |
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111 | } |
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112 | |
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113 | /** |
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114 | * @brief Gets the owner of the mutex. |
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115 | * |
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116 | * @param the_mutex The mutex to get the owner from. |
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117 | * |
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118 | * @return The owner of the mutex. |
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119 | */ |
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120 | static inline Thread_Control *_CORE_mutex_Get_owner( |
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121 | const CORE_mutex_Control *the_mutex |
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122 | ) |
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123 | { |
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124 | return the_mutex->Wait_queue.Queue.owner; |
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125 | } |
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126 | |
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127 | /** |
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128 | * @brief Checks if the mutex is locked. |
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129 | * |
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130 | * This routine returns true if the specified mutex is locked and false |
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131 | * otherwise. |
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132 | * |
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133 | * @param the_mutex The mutex to check if it is locked. |
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134 | * |
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135 | * @retval true The mutex is locked. |
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136 | * @retval false The mutex is not locked. |
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137 | */ |
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138 | static inline bool _CORE_mutex_Is_locked( |
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139 | const CORE_mutex_Control *the_mutex |
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140 | ) |
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141 | { |
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142 | return _CORE_mutex_Get_owner( the_mutex ) != NULL; |
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143 | } |
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144 | |
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145 | /** |
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146 | * @brief Seize the mutex slowly. |
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147 | * |
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148 | * @param[in, out] the_mutex The mutex to seize. |
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149 | * @param operations The thread queue operations. |
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150 | * @param executing The calling thread. |
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151 | * @param wait Indicates whether the calling thread is willing to wait. |
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152 | * @param queue_context The thread queue context. |
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153 | * |
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154 | * @retval _Thread_Wait_get_status The status of the executing thread. |
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155 | * @retval STATUS_UNAVAILABLE The calling thread is not willing to wait. |
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156 | */ |
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157 | Status_Control _CORE_mutex_Seize_slow( |
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158 | CORE_mutex_Control *the_mutex, |
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159 | const Thread_queue_Operations *operations, |
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160 | Thread_Control *executing, |
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161 | bool wait, |
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162 | Thread_queue_Context *queue_context |
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163 | ); |
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164 | |
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165 | /** |
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166 | * @brief Sets the owner of the mutex. |
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167 | * |
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168 | * @param[out] the_mutex The mutex to set the owner from. |
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169 | * @param owner The new owner of the mutex. |
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170 | */ |
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171 | static inline void _CORE_mutex_Set_owner( |
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172 | CORE_mutex_Control *the_mutex, |
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173 | Thread_Control *owner |
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174 | ) |
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175 | { |
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176 | the_mutex->Wait_queue.Queue.owner = owner; |
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177 | } |
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178 | |
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179 | /** |
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180 | * @brief Checks if the the thread is the owner of the mutex. |
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181 | * |
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182 | * @param the_mutex The mutex to check the owner of. |
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183 | * @param the_thread The thread to check if it is the owner of @a the_mutex. |
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184 | * |
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185 | * @retval true @a the_thread is the owner of @a the_mutex. |
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186 | * @retval false @a the_thread is not the owner of @a the_mutex. |
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187 | */ |
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188 | static inline bool _CORE_mutex_Is_owner( |
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189 | const CORE_mutex_Control *the_mutex, |
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190 | const Thread_Control *the_thread |
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191 | ) |
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192 | { |
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193 | return _CORE_mutex_Get_owner( the_mutex ) == the_thread; |
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194 | } |
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195 | |
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196 | /** |
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197 | * @brief Initializes a recursive mutex. |
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198 | * |
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199 | * @param[out] the_mutex The recursive mutex to initialize. |
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200 | */ |
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201 | static inline void _CORE_recursive_mutex_Initialize( |
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202 | CORE_recursive_mutex_Control *the_mutex |
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203 | ) |
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204 | { |
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205 | _CORE_mutex_Initialize( &the_mutex->Mutex ); |
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206 | the_mutex->nest_level = 0; |
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207 | } |
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208 | |
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209 | /** |
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210 | * @brief Seizes the recursive mutex nested. |
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211 | * |
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212 | * @param[out] the_mutex The recursive mutex to seize nested. |
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213 | * |
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214 | * @return STATUS_SUCCESSFUL, this method is always successful. |
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215 | */ |
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216 | static inline Status_Control _CORE_recursive_mutex_Seize_nested( |
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217 | CORE_recursive_mutex_Control *the_mutex |
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218 | ) |
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219 | { |
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220 | ++the_mutex->nest_level; |
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221 | return STATUS_SUCCESSFUL; |
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222 | } |
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223 | |
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224 | /** |
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225 | * @brief Seizes the recursive mutex. |
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226 | * |
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227 | * @param[in, out] the_mutex The recursive mutex to seize. |
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228 | * @param operations The thread queue operations. |
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229 | * @param[out] executing The executing thread. |
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230 | * @param wait Indicates whether the calling thread is willing to wait. |
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231 | * @param nested Returns the status of a recursive mutex. |
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232 | * @param queue_context The thread queue context. |
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233 | * |
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234 | * @retval STATUS_SUCCESSFUL The owner of the mutex was NULL, successful |
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235 | * seizing of the mutex. |
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236 | * @retval _Thread_Wait_get_status The status of the executing thread. |
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237 | * @retval STATUS_UNAVAILABLE The calling thread is not willing to wait. |
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238 | */ |
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239 | static inline Status_Control _CORE_recursive_mutex_Seize( |
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240 | CORE_recursive_mutex_Control *the_mutex, |
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241 | const Thread_queue_Operations *operations, |
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242 | Thread_Control *executing, |
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243 | bool wait, |
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244 | Status_Control ( *nested )( CORE_recursive_mutex_Control * ), |
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245 | Thread_queue_Context *queue_context |
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246 | ) |
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247 | { |
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248 | Thread_Control *owner; |
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249 | |
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250 | _CORE_mutex_Acquire_critical( &the_mutex->Mutex, queue_context ); |
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251 | |
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252 | owner = _CORE_mutex_Get_owner( &the_mutex->Mutex ); |
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253 | |
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254 | if ( owner == NULL ) { |
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255 | _CORE_mutex_Set_owner( &the_mutex->Mutex, executing ); |
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256 | _Thread_Resource_count_increment( executing ); |
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257 | _CORE_mutex_Release( &the_mutex->Mutex, queue_context ); |
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258 | return STATUS_SUCCESSFUL; |
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259 | } |
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260 | |
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261 | if ( owner == executing ) { |
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262 | Status_Control status; |
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263 | |
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264 | status = ( *nested )( the_mutex ); |
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265 | _CORE_mutex_Release( &the_mutex->Mutex, queue_context ); |
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266 | return status; |
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267 | } |
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268 | |
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269 | return _CORE_mutex_Seize_slow( |
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270 | &the_mutex->Mutex, |
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271 | operations, |
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272 | executing, |
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273 | wait, |
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274 | queue_context |
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275 | ); |
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276 | } |
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277 | |
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278 | /** |
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279 | * @brief Surrenders the recursive mutex. |
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280 | * |
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281 | * @param[in, out] the_mutex The recursive mutex to surrender. |
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282 | * @param operations The thread queue operations. |
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283 | * @param executing The executing thread. |
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284 | * @param queue_context the thread queue context. |
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285 | * |
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286 | * @retval STATUS_SUCCESSFUL @a the_mutex is successfully surrendered. |
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287 | * @retval STATUS_NOT_OWNER The executing thread does not own @a the_mutex. |
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288 | */ |
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289 | static inline Status_Control _CORE_recursive_mutex_Surrender( |
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290 | CORE_recursive_mutex_Control *the_mutex, |
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291 | const Thread_queue_Operations *operations, |
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292 | Thread_Control *executing, |
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293 | Thread_queue_Context *queue_context |
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294 | ) |
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295 | { |
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296 | unsigned int nest_level; |
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297 | Thread_queue_Heads *heads; |
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298 | |
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299 | _CORE_mutex_Acquire_critical( &the_mutex->Mutex, queue_context ); |
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300 | |
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301 | if ( !_CORE_mutex_Is_owner( &the_mutex->Mutex, executing ) ) { |
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302 | _CORE_mutex_Release( &the_mutex->Mutex, queue_context ); |
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303 | return STATUS_NOT_OWNER; |
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304 | } |
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305 | |
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306 | nest_level = the_mutex->nest_level; |
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307 | |
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308 | if ( nest_level > 0 ) { |
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309 | the_mutex->nest_level = nest_level - 1; |
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310 | _CORE_mutex_Release( &the_mutex->Mutex, queue_context ); |
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311 | return STATUS_SUCCESSFUL; |
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312 | } |
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313 | |
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314 | _Thread_Resource_count_decrement( executing ); |
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315 | _CORE_mutex_Set_owner( &the_mutex->Mutex, NULL ); |
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316 | |
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317 | heads = the_mutex->Mutex.Wait_queue.Queue.heads; |
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318 | |
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319 | if ( heads == NULL ) { |
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320 | _CORE_mutex_Release( &the_mutex->Mutex, queue_context ); |
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321 | return STATUS_SUCCESSFUL; |
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322 | } |
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323 | |
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324 | _Thread_queue_Surrender( |
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325 | &the_mutex->Mutex.Wait_queue.Queue, |
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326 | heads, |
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327 | executing, |
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328 | queue_context, |
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329 | operations |
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330 | ); |
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331 | return STATUS_SUCCESSFUL; |
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332 | } |
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333 | |
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334 | /** |
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335 | * @brief initializes a ceiling mutex. |
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336 | * |
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337 | * @param[out] the_mutex The ceiling mutex to initialize. |
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338 | * @param scheduler The scheduler for the new ceiling mutex. |
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339 | * Only needed if RTEMS_SMP is defined |
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340 | * @param priority_ceiling The priority ceiling for the initialized mutex. |
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341 | */ |
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342 | static inline void _CORE_ceiling_mutex_Initialize( |
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343 | CORE_ceiling_mutex_Control *the_mutex, |
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344 | const Scheduler_Control *scheduler, |
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345 | Priority_Control priority_ceiling |
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346 | ) |
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347 | { |
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348 | _CORE_recursive_mutex_Initialize( &the_mutex->Recursive ); |
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349 | _Priority_Node_initialize( &the_mutex->Priority_ceiling, priority_ceiling ); |
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350 | #if defined(RTEMS_SMP) |
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351 | the_mutex->scheduler = scheduler; |
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352 | #endif |
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353 | } |
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354 | |
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355 | /** |
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356 | * @brief Gets the scheduler of the ceiling mutex. |
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357 | * |
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358 | * @param the_mutex The ceiling mutex to get the scheduler from. |
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359 | * |
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360 | * @return The scheduler of the mutex. If RTEMS_SMP is not defined, the first entry of the _Scheduler_Table is returned. |
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361 | */ |
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362 | static inline const Scheduler_Control * |
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363 | _CORE_ceiling_mutex_Get_scheduler( |
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364 | const CORE_ceiling_mutex_Control *the_mutex |
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365 | ) |
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366 | { |
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367 | #if defined(RTEMS_SMP) |
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368 | return the_mutex->scheduler; |
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369 | #else |
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370 | return &_Scheduler_Table[ 0 ]; |
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371 | #endif |
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372 | } |
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373 | |
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374 | /** |
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375 | * @brief Sets the priority of the ceiling mutex. |
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376 | * |
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377 | * @param[out] the_mutex The ceiling mutex to set the priority of. |
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378 | * @param priority_ceiling The new priority ceiling of the mutex. |
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379 | */ |
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380 | static inline void _CORE_ceiling_mutex_Set_priority( |
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381 | CORE_ceiling_mutex_Control *the_mutex, |
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382 | Priority_Control priority_ceiling |
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383 | ) |
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384 | { |
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385 | Thread_Control *owner; |
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386 | |
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387 | owner = _CORE_mutex_Get_owner( &the_mutex->Recursive.Mutex ); |
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388 | |
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389 | if ( owner != NULL ) { |
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390 | Thread_queue_Context queue_context; |
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391 | |
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392 | _Thread_queue_Context_initialize( &queue_context ); |
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393 | _Thread_queue_Context_clear_priority_updates( &queue_context ); |
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394 | _Thread_Wait_acquire_critical( owner, &queue_context ); |
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395 | _Thread_Priority_change( |
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396 | owner, |
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397 | &the_mutex->Priority_ceiling, |
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398 | priority_ceiling, |
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399 | PRIORITY_GROUP_LAST, |
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400 | &queue_context |
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401 | ); |
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402 | _Thread_Wait_release_critical( owner, &queue_context ); |
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403 | } else { |
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404 | the_mutex->Priority_ceiling.priority = priority_ceiling; |
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405 | } |
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406 | } |
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407 | |
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408 | /** |
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409 | * @brief Gets the priority of the ceiling mutex. |
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410 | * |
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411 | * @param the_mutex The mutex to get the priority from. |
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412 | * |
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413 | * @return The priority ceiling of @a the_mutex. |
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414 | */ |
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415 | static inline Priority_Control _CORE_ceiling_mutex_Get_priority( |
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416 | const CORE_ceiling_mutex_Control *the_mutex |
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417 | ) |
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418 | { |
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419 | return the_mutex->Priority_ceiling.priority; |
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420 | } |
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421 | |
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422 | /** |
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423 | * @brief Sets the owner of the ceiling mutex. |
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424 | * |
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425 | * @param[in, out] the_mutex The mutex to set the owner of. |
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426 | * @param owner The new owner of @a the_mutex. |
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427 | * @param queue_context The thread queue context. |
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428 | * |
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429 | * @retval STATUS_SUCCESSFUL The owner of the mutex was changed successfully. |
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430 | * @retval STATUS_MUTEX_CEILING_VIOLATED The owners wait priority |
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431 | * is smaller than the priority of the ceiling mutex. |
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432 | */ |
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433 | static inline Status_Control _CORE_ceiling_mutex_Set_owner( |
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434 | CORE_ceiling_mutex_Control *the_mutex, |
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435 | Thread_Control *owner, |
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436 | Thread_queue_Context *queue_context |
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437 | ) |
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438 | { |
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439 | ISR_lock_Context lock_context; |
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440 | Scheduler_Node *scheduler_node; |
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441 | Per_CPU_Control *cpu_self; |
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442 | |
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443 | _Thread_Wait_acquire_default_critical( owner, &lock_context ); |
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444 | |
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445 | scheduler_node = _Thread_Scheduler_get_home_node( owner ); |
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446 | |
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447 | if ( |
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448 | _Priority_Get_priority( &scheduler_node->Wait.Priority ) |
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449 | < the_mutex->Priority_ceiling.priority |
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450 | ) { |
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451 | _Thread_Wait_release_default_critical( owner, &lock_context ); |
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452 | _CORE_mutex_Release( &the_mutex->Recursive.Mutex, queue_context ); |
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453 | return STATUS_MUTEX_CEILING_VIOLATED; |
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454 | } |
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455 | |
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456 | _CORE_mutex_Set_owner( &the_mutex->Recursive.Mutex, owner ); |
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457 | _Thread_Resource_count_increment( owner ); |
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458 | _Thread_Priority_add( |
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459 | owner, |
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460 | &the_mutex->Priority_ceiling, |
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461 | queue_context |
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462 | ); |
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463 | _Thread_Wait_release_default_critical( owner, &lock_context ); |
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464 | |
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465 | cpu_self = _Thread_queue_Dispatch_disable( queue_context ); |
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466 | _CORE_mutex_Release( &the_mutex->Recursive.Mutex, queue_context ); |
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467 | _Thread_Priority_update( queue_context ); |
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468 | _Thread_Dispatch_enable( cpu_self ); |
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469 | return STATUS_SUCCESSFUL; |
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470 | } |
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471 | |
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472 | /** |
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473 | * @brief Seizes the ceiling mutex. |
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474 | * |
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475 | * @param[in, out] the_mutex The mutex to seize. |
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476 | * @param executing The executing thread. |
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477 | * @param wait Indicates whether the calling thread is willing to wait. |
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478 | * @param nested Function that returns the status of the recursive mutex |
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479 | * @param queue_context The thread queue context. |
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480 | * |
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481 | * @retval STATUS_SUCCESSFUL The owner of the mutex was changed successfully. |
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482 | * @retval STATUS_NOT_DEFINED If the scheduler of the executing thread is not equal to the owner of @a the_mutex . |
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483 | * @retval STATUS_MUTEX_CEILING_VIOLATED The owners wait priority |
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484 | * is smaller than the priority of the ceiling mutex. |
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485 | * @retval other Return value of @a nested. |
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486 | */ |
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487 | static inline Status_Control _CORE_ceiling_mutex_Seize( |
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488 | CORE_ceiling_mutex_Control *the_mutex, |
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489 | Thread_Control *executing, |
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490 | bool wait, |
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491 | Status_Control ( *nested )( CORE_recursive_mutex_Control * ), |
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492 | Thread_queue_Context *queue_context |
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493 | ) |
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494 | { |
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495 | Thread_Control *owner; |
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496 | |
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497 | _CORE_mutex_Acquire_critical( &the_mutex->Recursive.Mutex, queue_context ); |
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498 | |
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499 | #if defined(RTEMS_SMP) |
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500 | if ( |
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501 | _Thread_Scheduler_get_home( executing ) |
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502 | != _CORE_ceiling_mutex_Get_scheduler( the_mutex ) |
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503 | ) { |
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504 | _CORE_mutex_Release( &the_mutex->Recursive.Mutex, queue_context ); |
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505 | return STATUS_NOT_DEFINED; |
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506 | } |
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507 | #endif |
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508 | |
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509 | owner = _CORE_mutex_Get_owner( &the_mutex->Recursive.Mutex ); |
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510 | |
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511 | if ( owner == NULL ) { |
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512 | _Thread_queue_Context_clear_priority_updates( queue_context ); |
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513 | return _CORE_ceiling_mutex_Set_owner( |
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514 | the_mutex, |
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515 | executing, |
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516 | queue_context |
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517 | ); |
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518 | } |
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519 | |
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520 | if ( owner == executing ) { |
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521 | Status_Control status; |
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522 | |
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523 | status = ( *nested )( &the_mutex->Recursive ); |
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524 | _CORE_mutex_Release( &the_mutex->Recursive.Mutex, queue_context ); |
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525 | return status; |
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526 | } |
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527 | |
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528 | return _CORE_mutex_Seize_slow( |
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529 | &the_mutex->Recursive.Mutex, |
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530 | CORE_MUTEX_TQ_OPERATIONS, |
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531 | executing, |
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532 | wait, |
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533 | queue_context |
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534 | ); |
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535 | } |
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536 | |
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537 | /** |
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538 | * @brief Surrenders the ceiling mutex. |
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539 | * |
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540 | * @param[in, out] the_mutex The ceiling mutex to surrender. |
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541 | * @param executing The executing thread. |
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542 | * @param queue_context The thread queue context. |
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543 | * |
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544 | * @retval STATUS_SUCCESSFUL The ceiling mutex was successfullysurrendered. |
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545 | * @retval STATUS_NOT_OWNER The executing thread is not the owner of @a the_mutex. |
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546 | */ |
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547 | static inline Status_Control _CORE_ceiling_mutex_Surrender( |
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548 | CORE_ceiling_mutex_Control *the_mutex, |
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549 | Thread_Control *executing, |
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550 | Thread_queue_Context *queue_context |
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551 | ) |
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552 | { |
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553 | unsigned int nest_level; |
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554 | |
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555 | _CORE_mutex_Acquire_critical( &the_mutex->Recursive.Mutex, queue_context ); |
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556 | |
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557 | if ( !_CORE_mutex_Is_owner( &the_mutex->Recursive.Mutex, executing ) ) { |
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558 | _CORE_mutex_Release( &the_mutex->Recursive.Mutex, queue_context ); |
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559 | return STATUS_NOT_OWNER; |
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560 | } |
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561 | |
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562 | nest_level = the_mutex->Recursive.nest_level; |
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563 | |
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564 | if ( nest_level > 0 ) { |
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565 | the_mutex->Recursive.nest_level = nest_level - 1; |
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566 | _CORE_mutex_Release( &the_mutex->Recursive.Mutex, queue_context ); |
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567 | return STATUS_SUCCESSFUL; |
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568 | } |
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569 | |
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570 | return _Thread_queue_Surrender_priority_ceiling( |
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571 | &the_mutex->Recursive.Mutex.Wait_queue.Queue, |
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572 | executing, |
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573 | &the_mutex->Priority_ceiling, |
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574 | queue_context, |
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575 | CORE_MUTEX_TQ_OPERATIONS |
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576 | ); |
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577 | } |
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578 | |
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579 | /** @} */ |
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580 | |
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581 | #ifdef __cplusplus |
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582 | } |
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583 | #endif |
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584 | |
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585 | #endif |
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586 | /* end of include file */ |
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