1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup ScoreMutex |
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5 | * |
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6 | * @brief CORE Mutex Implementation |
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7 | */ |
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8 | |
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9 | /* |
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10 | * COPYRIGHT (c) 1989-2009. |
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11 | * On-Line Applications Research Corporation (OAR). |
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12 | * |
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13 | * The license and distribution terms for this file may be |
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14 | * found in the file LICENSE in this distribution or at |
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15 | * http://www.rtems.org/license/LICENSE. |
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16 | */ |
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17 | |
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18 | #ifndef _RTEMS_SCORE_COREMUTEXIMPL_H |
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19 | #define _RTEMS_SCORE_COREMUTEXIMPL_H |
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20 | |
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21 | #include <rtems/score/coremutex.h> |
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22 | #include <rtems/score/chainimpl.h> |
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23 | #include <rtems/score/schedulerimpl.h> |
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24 | #include <rtems/score/status.h> |
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25 | #include <rtems/score/threadimpl.h> |
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26 | #include <rtems/score/threadqimpl.h> |
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27 | |
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28 | #ifdef __cplusplus |
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29 | extern "C" { |
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30 | #endif |
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31 | |
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32 | /** |
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33 | * @addtogroup ScoreMutex |
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34 | */ |
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35 | /**@{**/ |
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36 | |
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37 | #define CORE_MUTEX_TQ_OPERATIONS &_Thread_queue_Operations_priority |
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38 | |
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39 | RTEMS_INLINE_ROUTINE void _CORE_mutex_Initialize( |
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40 | CORE_mutex_Control *the_mutex |
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41 | ) |
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42 | { |
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43 | _Thread_queue_Initialize( &the_mutex->Wait_queue ); |
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44 | } |
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45 | |
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46 | RTEMS_INLINE_ROUTINE void _CORE_mutex_Destroy( CORE_mutex_Control *the_mutex ) |
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47 | { |
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48 | _Thread_queue_Destroy( &the_mutex->Wait_queue ); |
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49 | } |
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50 | |
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51 | RTEMS_INLINE_ROUTINE void _CORE_mutex_Acquire_critical( |
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52 | CORE_mutex_Control *the_mutex, |
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53 | Thread_queue_Context *queue_context |
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54 | ) |
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55 | { |
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56 | _Thread_queue_Acquire_critical( |
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57 | &the_mutex->Wait_queue, |
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58 | &queue_context->Lock_context |
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59 | ); |
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60 | } |
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61 | |
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62 | RTEMS_INLINE_ROUTINE void _CORE_mutex_Release( |
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63 | CORE_mutex_Control *the_mutex, |
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64 | Thread_queue_Context *queue_context |
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65 | ) |
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66 | { |
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67 | _Thread_queue_Release( |
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68 | &the_mutex->Wait_queue, |
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69 | &queue_context->Lock_context |
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70 | ); |
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71 | } |
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72 | |
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73 | RTEMS_INLINE_ROUTINE Thread_Control *_CORE_mutex_Get_owner( |
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74 | const CORE_mutex_Control *the_mutex |
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75 | ) |
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76 | { |
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77 | return the_mutex->Wait_queue.Queue.owner; |
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78 | } |
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79 | |
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80 | /** |
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81 | * @brief Is mutex locked. |
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82 | * |
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83 | * This routine returns true if the mutex specified is locked and false |
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84 | * otherwise. |
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85 | * |
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86 | * @param[in] the_mutex is the mutex to check. |
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87 | * |
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88 | * @retval true The mutex is locked. |
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89 | * @retval false The mutex is not locked. |
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90 | */ |
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91 | RTEMS_INLINE_ROUTINE bool _CORE_mutex_Is_locked( |
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92 | const CORE_mutex_Control *the_mutex |
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93 | ) |
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94 | { |
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95 | return _CORE_mutex_Get_owner( the_mutex ) != NULL; |
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96 | } |
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97 | |
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98 | Status_Control _CORE_mutex_Seize_slow( |
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99 | CORE_mutex_Control *the_mutex, |
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100 | Thread_Control *executing, |
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101 | Thread_Control *owner, |
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102 | bool wait, |
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103 | Watchdog_Interval timeout, |
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104 | Thread_queue_Context *queue_context |
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105 | ); |
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106 | |
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107 | Status_Control _CORE_mutex_Seize_no_protocol_slow( |
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108 | CORE_mutex_Control *the_mutex, |
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109 | const Thread_queue_Operations *operations, |
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110 | Thread_Control *executing, |
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111 | bool wait, |
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112 | Watchdog_Interval timeout, |
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113 | Thread_queue_Context *queue_context |
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114 | ); |
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115 | |
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116 | Status_Control _CORE_mutex_Surrender_slow( |
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117 | CORE_mutex_Control *the_mutex, |
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118 | Thread_Control *executing, |
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119 | Thread_queue_Heads *heads, |
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120 | bool keep_priority, |
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121 | Thread_queue_Context *queue_context |
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122 | ); |
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123 | |
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124 | RTEMS_INLINE_ROUTINE void _CORE_mutex_Set_owner( |
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125 | CORE_mutex_Control *the_mutex, |
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126 | Thread_Control *owner |
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127 | ) |
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128 | { |
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129 | the_mutex->Wait_queue.Queue.owner = owner; |
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130 | } |
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131 | |
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132 | RTEMS_INLINE_ROUTINE bool _CORE_mutex_Is_owner( |
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133 | const CORE_mutex_Control *the_mutex, |
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134 | const Thread_Control *the_thread |
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135 | ) |
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136 | { |
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137 | return _CORE_mutex_Get_owner( the_mutex ) == the_thread; |
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138 | } |
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139 | |
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140 | RTEMS_INLINE_ROUTINE void _CORE_mutex_Restore_priority( |
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141 | Thread_Control *executing |
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142 | ) |
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143 | { |
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144 | /* |
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145 | * Whether or not someone is waiting for the mutex, an |
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146 | * inherited priority must be lowered if this is the last |
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147 | * mutex (i.e. resource) this task has. |
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148 | */ |
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149 | if ( !_Thread_Owns_resources( executing ) ) { |
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150 | /* |
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151 | * Ensure that the executing resource count is visible to all other |
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152 | * processors and that we read the latest priority restore hint. |
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153 | */ |
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154 | _Atomic_Fence( ATOMIC_ORDER_ACQ_REL ); |
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155 | |
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156 | if ( executing->priority_restore_hint ) { |
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157 | Per_CPU_Control *cpu_self; |
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158 | |
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159 | cpu_self = _Thread_Dispatch_disable(); |
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160 | _Thread_Restore_priority( executing ); |
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161 | _Thread_Dispatch_enable( cpu_self ); |
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162 | } |
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163 | } |
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164 | } |
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165 | |
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166 | RTEMS_INLINE_ROUTINE void _CORE_recursive_mutex_Initialize( |
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167 | CORE_recursive_mutex_Control *the_mutex |
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168 | ) |
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169 | { |
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170 | _CORE_mutex_Initialize( &the_mutex->Mutex ); |
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171 | the_mutex->nest_level = 0; |
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172 | } |
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173 | |
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174 | RTEMS_INLINE_ROUTINE Status_Control _CORE_recursive_mutex_Seize_nested( |
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175 | CORE_recursive_mutex_Control *the_mutex |
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176 | ) |
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177 | { |
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178 | ++the_mutex->nest_level; |
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179 | return STATUS_SUCCESSFUL; |
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180 | } |
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181 | |
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182 | RTEMS_INLINE_ROUTINE Status_Control _CORE_recursive_mutex_Seize( |
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183 | CORE_recursive_mutex_Control *the_mutex, |
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184 | Thread_Control *executing, |
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185 | bool wait, |
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186 | Watchdog_Interval timeout, |
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187 | Status_Control ( *nested )( CORE_recursive_mutex_Control * ), |
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188 | Thread_queue_Context *queue_context |
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189 | ) |
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190 | { |
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191 | Thread_Control *owner; |
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192 | |
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193 | _CORE_mutex_Acquire_critical( &the_mutex->Mutex, queue_context ); |
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194 | |
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195 | owner = _CORE_mutex_Get_owner( &the_mutex->Mutex ); |
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196 | |
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197 | if ( owner == NULL ) { |
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198 | _CORE_mutex_Set_owner( &the_mutex->Mutex, executing ); |
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199 | ++executing->resource_count; |
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200 | _CORE_mutex_Release( &the_mutex->Mutex, queue_context ); |
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201 | return STATUS_SUCCESSFUL; |
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202 | } |
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203 | |
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204 | if ( owner == executing ) { |
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205 | Status_Control status; |
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206 | |
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207 | status = ( *nested )( the_mutex ); |
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208 | _CORE_mutex_Release( &the_mutex->Mutex, queue_context ); |
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209 | return status; |
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210 | } |
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211 | |
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212 | return _CORE_mutex_Seize_slow( |
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213 | &the_mutex->Mutex, |
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214 | executing, |
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215 | owner, |
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216 | wait, |
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217 | timeout, |
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218 | queue_context |
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219 | ); |
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220 | } |
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221 | |
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222 | RTEMS_INLINE_ROUTINE Status_Control _CORE_recursive_mutex_Surrender( |
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223 | CORE_recursive_mutex_Control *the_mutex, |
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224 | Thread_Control *executing, |
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225 | Thread_queue_Context *queue_context |
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226 | ) |
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227 | { |
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228 | unsigned int nest_level; |
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229 | Thread_queue_Heads *heads; |
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230 | bool keep_priority; |
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231 | |
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232 | _CORE_mutex_Acquire_critical( &the_mutex->Mutex, queue_context ); |
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233 | |
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234 | if ( !_CORE_mutex_Is_owner( &the_mutex->Mutex, executing ) ) { |
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235 | _CORE_mutex_Release( &the_mutex->Mutex, queue_context ); |
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236 | return STATUS_NOT_OWNER; |
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237 | } |
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238 | |
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239 | nest_level = the_mutex->nest_level; |
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240 | |
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241 | if ( nest_level > 0 ) { |
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242 | the_mutex->nest_level = nest_level - 1; |
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243 | _CORE_mutex_Release( &the_mutex->Mutex, queue_context ); |
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244 | return STATUS_SUCCESSFUL; |
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245 | } |
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246 | |
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247 | --executing->resource_count; |
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248 | _CORE_mutex_Set_owner( &the_mutex->Mutex, NULL ); |
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249 | |
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250 | /* |
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251 | * Ensure that the owner resource count is visible to all other |
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252 | * processors and that we read the latest priority restore |
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253 | * hint. |
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254 | */ |
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255 | _Atomic_Fence( ATOMIC_ORDER_ACQ_REL ); |
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256 | |
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257 | heads = the_mutex->Mutex.Wait_queue.Queue.heads; |
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258 | keep_priority = _Thread_Owns_resources( executing ) |
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259 | || !executing->priority_restore_hint; |
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260 | |
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261 | if ( heads == NULL && keep_priority ) { |
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262 | _CORE_mutex_Release( &the_mutex->Mutex, queue_context ); |
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263 | return STATUS_SUCCESSFUL; |
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264 | } |
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265 | |
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266 | return _CORE_mutex_Surrender_slow( |
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267 | &the_mutex->Mutex, |
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268 | executing, |
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269 | heads, |
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270 | keep_priority, |
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271 | queue_context |
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272 | ); |
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273 | } |
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274 | |
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275 | RTEMS_INLINE_ROUTINE Status_Control _CORE_recursive_mutex_Seize_no_protocol( |
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276 | CORE_recursive_mutex_Control *the_mutex, |
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277 | const Thread_queue_Operations *operations, |
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278 | Thread_Control *executing, |
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279 | bool wait, |
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280 | Watchdog_Interval timeout, |
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281 | Status_Control ( *nested )( CORE_recursive_mutex_Control * ), |
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282 | Thread_queue_Context *queue_context |
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283 | ) |
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284 | { |
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285 | Thread_Control *owner; |
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286 | |
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287 | _CORE_mutex_Acquire_critical( &the_mutex->Mutex, queue_context ); |
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288 | |
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289 | owner = _CORE_mutex_Get_owner( &the_mutex->Mutex ); |
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290 | |
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291 | if ( owner == NULL ) { |
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292 | _CORE_mutex_Set_owner( &the_mutex->Mutex, executing ); |
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293 | _CORE_mutex_Release( &the_mutex->Mutex, queue_context ); |
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294 | return STATUS_SUCCESSFUL; |
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295 | } |
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296 | |
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297 | if ( owner == executing ) { |
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298 | Status_Control status; |
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299 | |
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300 | status = ( *nested )( the_mutex ); |
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301 | _CORE_mutex_Release( &the_mutex->Mutex, queue_context ); |
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302 | return status; |
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303 | } |
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304 | |
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305 | return _CORE_mutex_Seize_no_protocol_slow( |
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306 | &the_mutex->Mutex, |
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307 | operations, |
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308 | executing, |
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309 | wait, |
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310 | timeout, |
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311 | queue_context |
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312 | ); |
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313 | } |
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314 | |
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315 | RTEMS_INLINE_ROUTINE Status_Control _CORE_recursive_mutex_Surrender_no_protocol( |
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316 | CORE_recursive_mutex_Control *the_mutex, |
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317 | const Thread_queue_Operations *operations, |
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318 | Thread_Control *executing, |
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319 | Thread_queue_Context *queue_context |
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320 | ) |
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321 | { |
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322 | unsigned int nest_level; |
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323 | Thread_Control *new_owner; |
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324 | |
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325 | _CORE_mutex_Acquire_critical( &the_mutex->Mutex, queue_context ); |
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326 | |
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327 | if ( !_CORE_mutex_Is_owner( &the_mutex->Mutex, executing ) ) { |
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328 | _CORE_mutex_Release( &the_mutex->Mutex, queue_context ); |
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329 | return STATUS_NOT_OWNER; |
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330 | } |
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331 | |
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332 | nest_level = the_mutex->nest_level; |
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333 | |
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334 | if ( nest_level > 0 ) { |
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335 | the_mutex->nest_level = nest_level - 1; |
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336 | _CORE_mutex_Release( &the_mutex->Mutex, queue_context ); |
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337 | return STATUS_SUCCESSFUL; |
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338 | } |
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339 | |
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340 | new_owner = _Thread_queue_First_locked( |
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341 | &the_mutex->Mutex.Wait_queue, |
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342 | operations |
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343 | ); |
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344 | _CORE_mutex_Set_owner( &the_mutex->Mutex, new_owner ); |
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345 | |
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346 | if ( new_owner == NULL ) { |
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347 | _CORE_mutex_Release( &the_mutex->Mutex, queue_context ); |
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348 | return STATUS_SUCCESSFUL; |
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349 | } |
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350 | |
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351 | _Thread_queue_Extract_critical( |
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352 | &the_mutex->Mutex.Wait_queue.Queue, |
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353 | operations, |
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354 | new_owner, |
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355 | queue_context |
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356 | ); |
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357 | return STATUS_SUCCESSFUL; |
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358 | } |
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359 | |
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360 | RTEMS_INLINE_ROUTINE void _CORE_ceiling_mutex_Initialize( |
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361 | CORE_ceiling_mutex_Control *the_mutex, |
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362 | const Scheduler_Control *scheduler, |
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363 | Priority_Control priority_ceiling |
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364 | ) |
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365 | { |
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366 | _CORE_recursive_mutex_Initialize( &the_mutex->Recursive ); |
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367 | the_mutex->priority_ceiling = priority_ceiling; |
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368 | #if defined(RTEMS_SMP) |
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369 | the_mutex->scheduler = scheduler; |
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370 | #endif |
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371 | } |
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372 | |
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373 | RTEMS_INLINE_ROUTINE const Scheduler_Control * |
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374 | _CORE_ceiling_mutex_Get_scheduler( |
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375 | const CORE_ceiling_mutex_Control *the_mutex |
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376 | ) |
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377 | { |
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378 | #if defined(RTEMS_SMP) |
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379 | return the_mutex->scheduler; |
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380 | #else |
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381 | return _Scheduler_Get_by_CPU_index( 0 ); |
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382 | #endif |
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383 | } |
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384 | |
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385 | RTEMS_INLINE_ROUTINE void _CORE_ceiling_mutex_Set_priority( |
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386 | CORE_ceiling_mutex_Control *the_mutex, |
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387 | Priority_Control priority_ceiling |
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388 | ) |
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389 | { |
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390 | the_mutex->priority_ceiling = priority_ceiling; |
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391 | } |
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392 | |
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393 | RTEMS_INLINE_ROUTINE Priority_Control _CORE_ceiling_mutex_Get_priority( |
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394 | const CORE_ceiling_mutex_Control *the_mutex |
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395 | ) |
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396 | { |
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397 | return the_mutex->priority_ceiling; |
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398 | } |
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399 | |
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400 | RTEMS_INLINE_ROUTINE Status_Control _CORE_ceiling_mutex_Set_owner( |
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401 | CORE_ceiling_mutex_Control *the_mutex, |
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402 | Thread_Control *owner, |
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403 | Thread_queue_Context *queue_context |
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404 | ) |
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405 | { |
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406 | Priority_Control priority_ceiling; |
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407 | Priority_Control current_priority; |
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408 | Per_CPU_Control *cpu_self; |
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409 | |
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410 | priority_ceiling = the_mutex->priority_ceiling; |
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411 | current_priority = owner->current_priority; |
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412 | |
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413 | if ( current_priority < priority_ceiling ) { |
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414 | _CORE_mutex_Release( &the_mutex->Recursive.Mutex, queue_context ); |
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415 | return STATUS_MUTEX_CEILING_VIOLATED; |
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416 | } |
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417 | |
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418 | _CORE_mutex_Set_owner( &the_mutex->Recursive.Mutex, owner ); |
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419 | ++owner->resource_count; |
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420 | |
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421 | if ( current_priority == priority_ceiling ) { |
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422 | _CORE_mutex_Release( &the_mutex->Recursive.Mutex, queue_context ); |
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423 | return STATUS_SUCCESSFUL; |
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424 | } |
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425 | |
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426 | cpu_self = _Thread_Dispatch_disable_critical( &queue_context->Lock_context ); |
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427 | _CORE_mutex_Release( &the_mutex->Recursive.Mutex, queue_context ); |
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428 | _Thread_Raise_priority( owner, priority_ceiling ); |
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429 | _Thread_Dispatch_enable( cpu_self ); |
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430 | return STATUS_SUCCESSFUL; |
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431 | } |
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432 | |
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433 | RTEMS_INLINE_ROUTINE Status_Control _CORE_ceiling_mutex_Seize( |
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434 | CORE_ceiling_mutex_Control *the_mutex, |
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435 | Thread_Control *executing, |
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436 | bool wait, |
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437 | Watchdog_Interval timeout, |
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438 | Status_Control ( *nested )( CORE_recursive_mutex_Control * ), |
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439 | Thread_queue_Context *queue_context |
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440 | ) |
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441 | { |
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442 | Thread_Control *owner; |
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443 | |
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444 | _CORE_mutex_Acquire_critical( &the_mutex->Recursive.Mutex, queue_context ); |
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445 | |
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446 | owner = _CORE_mutex_Get_owner( &the_mutex->Recursive.Mutex ); |
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447 | |
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448 | if ( owner == NULL ) { |
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449 | #if defined(RTEMS_SMP) |
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450 | if ( |
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451 | _Scheduler_Get_own( executing ) |
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452 | != _CORE_ceiling_mutex_Get_scheduler( the_mutex ) |
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453 | ) { |
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454 | _CORE_mutex_Release( &the_mutex->Recursive.Mutex, queue_context ); |
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455 | return STATUS_NOT_DEFINED; |
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456 | } |
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457 | #endif |
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458 | |
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459 | return _CORE_ceiling_mutex_Set_owner( |
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460 | the_mutex, |
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461 | executing, |
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462 | queue_context |
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463 | ); |
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464 | } |
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465 | |
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466 | if ( owner == executing ) { |
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467 | Status_Control status; |
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468 | |
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469 | status = ( *nested )( &the_mutex->Recursive ); |
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470 | _CORE_mutex_Release( &the_mutex->Recursive.Mutex, queue_context ); |
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471 | return status; |
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472 | } |
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473 | |
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474 | return _CORE_mutex_Seize_no_protocol_slow( |
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475 | &the_mutex->Recursive.Mutex, |
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476 | CORE_MUTEX_TQ_OPERATIONS, |
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477 | executing, |
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478 | wait, |
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479 | timeout, |
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480 | queue_context |
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481 | ); |
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482 | } |
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483 | |
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484 | RTEMS_INLINE_ROUTINE Status_Control _CORE_ceiling_mutex_Surrender( |
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485 | CORE_ceiling_mutex_Control *the_mutex, |
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486 | Thread_Control *executing, |
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487 | Thread_queue_Context *queue_context |
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488 | ) |
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489 | { |
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490 | unsigned int nest_level; |
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491 | Thread_Control *new_owner; |
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492 | |
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493 | _CORE_mutex_Acquire_critical( &the_mutex->Recursive.Mutex, queue_context ); |
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494 | |
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495 | if ( !_CORE_mutex_Is_owner( &the_mutex->Recursive.Mutex, executing ) ) { |
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496 | _CORE_mutex_Release( &the_mutex->Recursive.Mutex, queue_context ); |
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497 | return STATUS_NOT_OWNER; |
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498 | } |
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499 | |
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500 | nest_level = the_mutex->Recursive.nest_level; |
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501 | |
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502 | if ( nest_level > 0 ) { |
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503 | the_mutex->Recursive.nest_level = nest_level - 1; |
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504 | _CORE_mutex_Release( &the_mutex->Recursive.Mutex, queue_context ); |
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505 | return STATUS_SUCCESSFUL; |
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506 | } |
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507 | |
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508 | --executing->resource_count; |
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509 | |
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510 | new_owner = _Thread_queue_First_locked( |
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511 | &the_mutex->Recursive.Mutex.Wait_queue, |
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512 | CORE_MUTEX_TQ_OPERATIONS |
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513 | ); |
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514 | _CORE_mutex_Set_owner( &the_mutex->Recursive.Mutex, new_owner ); |
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515 | |
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516 | if ( new_owner != NULL ) { |
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517 | bool unblock; |
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518 | |
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519 | /* |
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520 | * We must extract the thread now since this will restore its default |
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521 | * thread lock. This is necessary to avoid a deadlock in the |
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522 | * _Thread_Change_priority() below due to a recursive thread queue lock |
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523 | * acquire. |
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524 | */ |
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525 | unblock = _Thread_queue_Extract_locked( |
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526 | &the_mutex->Recursive.Mutex.Wait_queue.Queue, |
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527 | CORE_MUTEX_TQ_OPERATIONS, |
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528 | new_owner, |
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529 | queue_context |
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530 | ); |
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531 | |
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532 | #if defined(RTEMS_MULTIPROCESSING) |
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533 | if ( _Objects_Is_local_id( new_owner->Object.id ) ) |
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534 | #endif |
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535 | { |
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536 | ++new_owner->resource_count; |
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537 | _Thread_Raise_priority( new_owner, the_mutex->priority_ceiling ); |
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538 | } |
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539 | |
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540 | _Thread_queue_Unblock_critical( |
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541 | unblock, |
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542 | &the_mutex->Recursive.Mutex.Wait_queue.Queue, |
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543 | new_owner, |
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544 | &queue_context->Lock_context |
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545 | ); |
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546 | } else { |
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547 | _CORE_mutex_Release( &the_mutex->Recursive.Mutex, queue_context ); |
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548 | } |
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549 | |
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550 | _CORE_mutex_Restore_priority( executing ); |
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551 | return STATUS_SUCCESSFUL; |
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552 | } |
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553 | |
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554 | /** @} */ |
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555 | |
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556 | #ifdef __cplusplus |
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557 | } |
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558 | #endif |
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559 | |
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560 | #endif |
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561 | /* end of include file */ |
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