1 | #include <pthread.h>
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2 |
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3 | #include "globals.h"
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4 | #include "module-datastruct-llist.h"
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5 | #define HASH_BUCKETS 16
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6 |
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7 | struct cs_garbage {
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8 | time_t time;
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9 | void * data;
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10 | #ifdef WITH_DEBUG
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11 | char *file;
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12 | uint16_t line;
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13 | #endif
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14 | struct cs_garbage *next;
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15 | };
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16 |
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17 | struct cs_garbage *garbage_first[HASH_BUCKETS];
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18 | pthread_mutex_t garbage_lock[HASH_BUCKETS];
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19 | pthread_t garbage_thread;
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20 | int32_t garbage_collector_active = 0;
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21 | int32_t garbage_debug = 0;
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22 |
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23 | #ifdef WITH_DEBUG
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24 | void add_garbage_debug(void *data, char *file, uint16_t line) {
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25 | #else
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26 | void add_garbage(void *data) {
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27 | #endif
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28 | if (!data)
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29 | return;
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30 |
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31 | if (!garbage_collector_active || garbage_debug) {
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32 | free(data);
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33 | return;
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34 | }
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35 |
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36 | int32_t bucket = (uintptr_t)data/16 % HASH_BUCKETS;
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37 | while (cs_trylock(&garbage_lock[bucket])) {
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38 | cs_debug_mask(D_TRACE, "trylock add_garbage wait");
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39 | cs_sleepms(fast_rnd());
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40 | }
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41 |
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42 | struct cs_garbage *garbagecheck = garbage_first[bucket];
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43 | while(garbagecheck) {
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44 | if(garbagecheck->data == data) {
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45 | cs_log("Found a try to add garbage twice. Not adding the element to garbage list...");
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46 | #ifdef WITH_DEBUG
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47 | cs_log("Current garbage addition: %s, line %d.", file, line);
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48 | cs_log("Original garbage addition: %s, line %d.", garbagecheck->file, garbagecheck->line);
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49 | #else
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50 | cs_log("Please compile with debug for exact info.");
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51 | #endif
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52 | break;
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53 | }
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54 | garbagecheck = garbagecheck->next;
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55 | }
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56 |
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57 | if (garbagecheck == NULL) {
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58 | struct cs_garbage *garbage = malloc(sizeof(struct cs_garbage));
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59 | garbage->time = time(NULL);
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60 | garbage->data = data;
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61 | garbage->next = garbage_first[bucket];
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62 | #ifdef WITH_DEBUG
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63 | garbage->file = file;
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64 | garbage->line = line;
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65 | #endif
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66 | garbage_first[bucket] = garbage;
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67 | }
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68 |
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69 | cs_unlock(&garbage_lock[bucket]);
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70 | }
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71 |
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72 | void garbage_collector() {
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73 | time_t now;
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74 | int32_t i;
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75 | struct cs_garbage *garbage, *next, *prev;
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76 |
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77 | while (garbage_collector_active) {
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78 |
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79 | for(i = 0; i < HASH_BUCKETS; ++i){
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80 | while (cs_trylock(&garbage_lock[i])) {
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81 | cs_debug_mask(D_TRACE, "trylock garbage_collector wait");
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82 | cs_sleepms(fast_rnd());
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83 | }
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84 | now = time(NULL);
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85 |
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86 | prev = NULL;
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87 | garbage = garbage_first[i];
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88 | while (garbage) {
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89 | next = garbage->next;
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90 | if (now > garbage->time+5) { //5 seconds!
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91 | free(garbage->data);
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92 |
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93 | if (prev)
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94 | prev->next = next;
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95 | else
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96 | garbage_first[i] = next;
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97 | free(garbage);
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98 | }
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99 | else
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100 | prev = garbage;
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101 | garbage = next;
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102 | }
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103 | cs_unlock(&garbage_lock[i]);
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104 | }
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105 | cs_sleepms(1000);
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106 | }
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107 | pthread_exit(NULL);
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108 | }
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109 |
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110 | void start_garbage_collector(int32_t debug) {
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111 |
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112 | garbage_debug = debug;
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113 | int32_t i;
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114 | for(i = 0; i < HASH_BUCKETS; ++i){
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115 | pthread_mutex_init(&garbage_lock[i], NULL);
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116 |
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117 | garbage_first[i] = NULL;
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118 | }
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119 | pthread_attr_t attr;
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120 | pthread_attr_init(&attr);
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121 |
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122 | garbage_collector_active = 1;
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123 |
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124 | #ifndef TUXBOX
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125 | pthread_attr_setstacksize(&attr, PTHREAD_STACK_SIZE);
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126 | #endif
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127 | pthread_create(&garbage_thread, &attr, (void*)&garbage_collector, NULL);
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128 | pthread_detach(garbage_thread);
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129 | pthread_attr_destroy(&attr);
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130 | }
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131 |
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132 | void stop_garbage_collector()
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133 | {
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134 | if (garbage_collector_active) {
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135 | int32_t i;
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136 |
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137 | garbage_collector_active = 0;
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138 | for(i = 0; i < HASH_BUCKETS; ++i)
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139 | cs_lock(&garbage_lock[i]);
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140 |
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141 | pthread_cancel(garbage_thread);
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142 | cs_sleepms(100);
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143 |
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144 | for(i = 0; i < HASH_BUCKETS; ++i){
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145 | while (garbage_first[i]) {
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146 | struct cs_garbage *next = garbage_first[i]->next;
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147 | free(garbage_first[i]->data);
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148 | free(garbage_first[i]);
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149 | garbage_first[i] = next;
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150 | }
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151 | cs_unlock(&garbage_lock[i]);
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152 | pthread_mutex_destroy(&garbage_lock[i]);
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153 | }
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154 | }
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155 | }
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