1 | /* |
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2 | * Copyright (c) 2014 embedded brains GmbH. All rights reserved. |
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3 | * |
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4 | * embedded brains GmbH |
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5 | * Dornierstr. 4 |
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6 | * 82178 Puchheim |
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7 | * Germany |
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8 | * <rtems@embedded-brains.de> |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.rtems.org/license/LICENSE. |
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13 | */ |
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14 | |
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15 | #ifdef HAVE_CONFIG_H |
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16 | #include "config.h" |
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17 | #endif |
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18 | |
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19 | #include <rtems/score/smplock.h> |
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20 | |
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21 | #include <string.h> |
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22 | |
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23 | #if defined(RTEMS_SMP) && defined(RTEMS_PROFILING) |
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24 | |
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25 | typedef struct { |
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26 | SMP_lock_Control Lock; |
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27 | Chain_Control Stats_chain; |
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28 | Chain_Control Iterator_chain; |
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29 | } SMP_lock_Stats_control; |
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30 | |
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31 | static SMP_lock_Stats_control _SMP_lock_Stats_control = { |
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32 | .Lock = { |
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33 | .Ticket_lock = { |
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34 | .next_ticket = ATOMIC_INITIALIZER_UINT( 0U ), |
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35 | .now_serving = ATOMIC_INITIALIZER_UINT( 0U ) |
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36 | }, |
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37 | .Stats = { |
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38 | .Node = CHAIN_NODE_INITIALIZER_ONE_NODE_CHAIN( |
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39 | &_SMP_lock_Stats_control.Stats_chain |
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40 | ), |
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41 | .name = "SMP Lock Stats" |
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42 | } |
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43 | }, |
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44 | .Stats_chain = CHAIN_INITIALIZER_ONE_NODE( |
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45 | &_SMP_lock_Stats_control.Lock.Stats.Node |
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46 | ), |
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47 | .Iterator_chain = CHAIN_INITIALIZER_EMPTY( |
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48 | _SMP_lock_Stats_control.Iterator_chain |
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49 | ) |
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50 | }; |
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51 | |
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52 | void _SMP_lock_Stats_destroy( SMP_lock_Stats *stats ) |
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53 | { |
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54 | if ( !_Chain_Is_node_off_chain( &stats->Node ) ) { |
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55 | SMP_lock_Stats_control *control = &_SMP_lock_Stats_control; |
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56 | SMP_lock_Context lock_context; |
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57 | SMP_lock_Stats_iteration_context *iteration_context; |
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58 | SMP_lock_Stats_iteration_context *iteration_context_tail; |
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59 | SMP_lock_Stats *next_stats; |
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60 | |
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61 | _SMP_lock_ISR_disable_and_acquire( &control->Lock, &lock_context ); |
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62 | |
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63 | next_stats = (SMP_lock_Stats *) _Chain_Next( &stats->Node ); |
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64 | _Chain_Extract_unprotected( &stats->Node ); |
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65 | |
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66 | iteration_context = (SMP_lock_Stats_iteration_context *) |
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67 | _Chain_First( &control->Iterator_chain ); |
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68 | iteration_context_tail = (SMP_lock_Stats_iteration_context *) |
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69 | _Chain_Tail( &control->Iterator_chain ); |
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70 | |
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71 | while ( iteration_context != iteration_context_tail ) { |
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72 | if ( iteration_context->current == stats ) { |
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73 | iteration_context->current = next_stats; |
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74 | } |
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75 | |
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76 | iteration_context = (SMP_lock_Stats_iteration_context *) |
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77 | _Chain_Next( &iteration_context->Node ); |
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78 | } |
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79 | |
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80 | _SMP_lock_Release_and_ISR_enable( &control->Lock, &lock_context ); |
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81 | } |
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82 | } |
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83 | |
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84 | void _SMP_lock_Stats_register( SMP_lock_Stats *stats ) |
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85 | { |
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86 | SMP_lock_Stats_control *control = &_SMP_lock_Stats_control; |
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87 | SMP_lock_Context lock_context; |
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88 | |
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89 | _SMP_lock_ISR_disable_and_acquire( &control->Lock, &lock_context ); |
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90 | _Chain_Append_unprotected( &control->Stats_chain, &stats->Node ); |
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91 | _SMP_lock_Release_and_ISR_enable( &control->Lock, &lock_context ); |
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92 | } |
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93 | |
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94 | void _SMP_lock_Stats_iteration_start( |
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95 | SMP_lock_Stats_iteration_context *iteration_context |
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96 | ) |
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97 | { |
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98 | SMP_lock_Stats_control *control = &_SMP_lock_Stats_control; |
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99 | SMP_lock_Context lock_context; |
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100 | |
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101 | _SMP_lock_ISR_disable_and_acquire( &control->Lock, &lock_context ); |
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102 | |
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103 | _Chain_Initialize_node( &iteration_context->Node ); |
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104 | _Chain_Append_unprotected( |
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105 | &control->Iterator_chain, |
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106 | &iteration_context->Node |
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107 | ); |
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108 | iteration_context->current = |
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109 | (SMP_lock_Stats *) _Chain_First( &control->Stats_chain ); |
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110 | |
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111 | _SMP_lock_Release_and_ISR_enable( &control->Lock, &lock_context ); |
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112 | } |
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113 | |
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114 | bool _SMP_lock_Stats_iteration_next( |
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115 | SMP_lock_Stats_iteration_context *iteration_context, |
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116 | SMP_lock_Stats *snapshot, |
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117 | char *name, |
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118 | size_t name_size |
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119 | ) |
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120 | { |
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121 | SMP_lock_Stats_control *control = &_SMP_lock_Stats_control; |
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122 | SMP_lock_Context lock_context; |
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123 | SMP_lock_Stats *current; |
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124 | bool valid; |
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125 | |
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126 | _SMP_lock_ISR_disable_and_acquire( &control->Lock, &lock_context ); |
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127 | |
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128 | current = iteration_context->current; |
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129 | if ( !_Chain_Is_tail( &control->Stats_chain, ¤t->Node ) ) { |
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130 | size_t name_len = current->name != NULL ? strlen(current->name) : 0; |
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131 | |
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132 | valid = true; |
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133 | |
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134 | iteration_context->current = (SMP_lock_Stats *) |
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135 | _Chain_Next( ¤t->Node ); |
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136 | |
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137 | *snapshot = *current; |
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138 | snapshot->name = name; |
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139 | |
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140 | if ( name_len >= name_size ) { |
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141 | name_len = name_size - 1; |
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142 | } |
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143 | |
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144 | name[name_len] = '\0'; |
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145 | memcpy(name, current->name, name_len); |
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146 | } else { |
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147 | valid = false; |
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148 | } |
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149 | |
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150 | _SMP_lock_Release_and_ISR_enable( &control->Lock, &lock_context ); |
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151 | |
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152 | return valid; |
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153 | } |
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154 | |
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155 | void _SMP_lock_Stats_iteration_stop( |
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156 | SMP_lock_Stats_iteration_context *iteration_context |
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157 | ) |
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158 | { |
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159 | SMP_lock_Stats_control *control = &_SMP_lock_Stats_control; |
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160 | SMP_lock_Context lock_context; |
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161 | |
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162 | _SMP_lock_ISR_disable_and_acquire( &control->Lock, &lock_context ); |
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163 | _Chain_Extract_unprotected( &iteration_context->Node ); |
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164 | _SMP_lock_Release_and_ISR_enable( &control->Lock, &lock_context ); |
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165 | } |
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166 | |
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167 | #endif /* RTEMS_SMP && RTEMS_PROFILING */ |
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