1 | #define MODULE_LOG_PREFIX "gc"
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2 |
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3 | #include "globals.h"
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4 | #include "oscam-garbage.h"
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5 | #include "oscam-lock.h"
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6 | #include "oscam-string.h"
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7 | #include "oscam-time.h"
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8 |
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9 | #define HASH_BUCKETS 250
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10 |
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11 | struct cs_garbage
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12 | {
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13 | time_t time;
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14 | void *data;
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15 | #ifdef WITH_DEBUG
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16 | char *file;
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17 | uint32_t line;
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18 | #endif
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19 | struct cs_garbage *next;
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20 | };
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21 |
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22 | static int32_t counter = 0;
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23 | static pthread_mutex_t add_lock;
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24 | static struct cs_garbage *garbage_first[HASH_BUCKETS];
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25 | static CS_MUTEX_LOCK garbage_lock[HASH_BUCKETS];
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26 | static pthread_t garbage_thread;
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27 | static int32_t garbage_collector_active;
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28 | static int32_t garbage_debug;
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29 |
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30 | #ifdef WITH_DEBUG
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31 | void add_garbage_debug(void *data, char *file, uint32_t line)
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32 | {
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33 | #else
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34 | void add_garbage(void *data)
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35 | {
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36 | #endif
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37 | if(!data)
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38 | { return; }
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39 |
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40 | if(!garbage_collector_active || garbage_debug == 1)
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41 | {
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42 | NULLFREE(data);
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43 | return;
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44 | }
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45 |
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46 | SAFE_MUTEX_LOCK(&add_lock);
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47 |
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48 | int32_t bucket = counter++;
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49 |
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50 | if(counter >= HASH_BUCKETS)
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51 | {
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52 | counter = 0;
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53 | }
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54 |
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55 | SAFE_MUTEX_UNLOCK(&add_lock);
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56 |
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57 | struct cs_garbage *garbage = (struct cs_garbage*)malloc(sizeof(struct cs_garbage));
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58 | if(garbage == NULL)
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59 | {
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60 | cs_log("*** MEMORY FULL -> FREEING DIRECT MAY LEAD TO INSTABILITY!!!! ***");
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61 | NULLFREE(data);
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62 | return;
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63 | }
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64 | garbage->time = time(NULL);
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65 | garbage->data = data;
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66 | garbage->next = NULL;
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67 | #ifdef WITH_DEBUG
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68 | garbage->file = file;
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69 | garbage->line = line;
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70 | #endif
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71 |
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72 | cs_writelock(__func__, &garbage_lock[bucket]);
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73 |
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74 | #ifdef WITH_DEBUG
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75 | if(garbage_debug == 2)
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76 | {
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77 | struct cs_garbage *garbagecheck = garbage_first[bucket];
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78 | while(garbagecheck)
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79 | {
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80 | if(garbagecheck->data == data)
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81 | {
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82 | cs_log("Found a try to add garbage twice. Not adding the element to garbage list...");
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83 | cs_log("Current garbage addition: %s, line %d.", file, line);
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84 | cs_log("Original garbage addition: %s, line %d.", garbagecheck->file, garbagecheck->line);
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85 | cs_writeunlock(__func__, &garbage_lock[bucket]);
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86 | NULLFREE(garbage);
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87 | return;
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88 | }
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89 | garbagecheck = garbagecheck->next;
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90 | }
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91 | }
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92 | #endif
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93 |
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94 | garbage->next = garbage_first[bucket];
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95 | garbage_first[bucket] = garbage;
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96 |
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97 | cs_writeunlock(__func__, &garbage_lock[bucket]);
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98 | }
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99 |
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100 | static pthread_cond_t sleep_cond;
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101 | static pthread_mutex_t sleep_cond_mutex;
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102 |
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103 | static void garbage_collector(void)
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104 | {
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105 | int32_t i,j;
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106 | struct cs_garbage *garbage, *next, *prev, *first;
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107 | set_thread_name(__func__);
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108 | int32_t timeout_time = 2*cfg.ctimeout/1000+6;
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109 |
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110 | while(garbage_collector_active)
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111 | {
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112 | time_t deltime = time(NULL) - timeout_time;
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113 |
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114 | for(i = 0; i < HASH_BUCKETS; ++i)
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115 | {
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116 | j = 0;
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117 | cs_writelock(__func__, &garbage_lock[i]);
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118 | first = garbage_first[i];
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119 |
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120 | for(garbage = first, prev = NULL; garbage; prev = garbage, garbage = garbage->next,j++)
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121 | {
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122 | if(j==2)
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123 | {
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124 | j++;
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125 | cs_writeunlock(__func__, &garbage_lock[i]);
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126 | }
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127 |
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128 | if(garbage->time < deltime) // all following elements are too new
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129 | {
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130 | if(prev)
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131 | {
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132 | prev->next = NULL;
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133 | }
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134 | else
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135 | {
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136 | garbage_first[i] = NULL;
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137 | }
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138 | break;
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139 | }
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140 | }
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141 |
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142 | if(j<3)
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143 | {
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144 | cs_writeunlock(__func__, &garbage_lock[i]);
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145 | }
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146 |
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147 | // list has been taken out before so we don't need a lock here anymore!
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148 | while(garbage)
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149 | {
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150 | next = garbage->next;
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151 | free(garbage->data);
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152 | free(garbage);
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153 | garbage = next;
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154 | }
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155 | }
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156 | sleepms_on_cond(__func__, &sleep_cond_mutex, &sleep_cond, 500);
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157 | }
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158 | pthread_exit(NULL);
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159 | }
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160 |
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161 | void start_garbage_collector(int32_t debug)
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162 | {
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163 |
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164 | garbage_debug = debug;
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165 | int32_t i;
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166 |
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167 | SAFE_MUTEX_INIT(&add_lock, NULL);
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168 |
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169 | for(i = 0; i < HASH_BUCKETS; ++i)
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170 | {
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171 | cs_lock_create(__func__, &garbage_lock[i], "garbage_lock", 9000);
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172 |
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173 | garbage_first[i] = NULL;
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174 | }
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175 | cs_pthread_cond_init(__func__, &sleep_cond_mutex, &sleep_cond);
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176 |
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177 | pthread_attr_t attr;
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178 | SAFE_ATTR_INIT(&attr);
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179 |
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180 | garbage_collector_active = 1;
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181 |
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182 | SAFE_ATTR_SETSTACKSIZE(&attr, PTHREAD_STACK_SIZE);
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183 | int32_t ret = pthread_create(&garbage_thread, &attr, (void *)&garbage_collector, NULL);
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184 | if(ret)
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185 | {
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186 | cs_log("ERROR: can't create garbagecollector thread (errno=%d %s)", ret, strerror(ret));
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187 | pthread_attr_destroy(&attr);
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188 | cs_exit(1);
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189 | }
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190 | pthread_attr_destroy(&attr);
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191 | }
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192 |
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193 | void stop_garbage_collector(void)
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194 | {
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195 | if(garbage_collector_active)
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196 | {
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197 | int32_t i;
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198 |
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199 | garbage_collector_active = 0;
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200 | SAFE_COND_SIGNAL(&sleep_cond);
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201 | cs_sleepms(1500);
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202 | SAFE_COND_SIGNAL(&sleep_cond);
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203 | SAFE_THREAD_JOIN(garbage_thread, NULL);
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204 | for(i = 0; i < HASH_BUCKETS; ++i)
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205 | { cs_writelock(__func__, &garbage_lock[i]); }
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206 |
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207 | for(i = 0; i < HASH_BUCKETS; ++i)
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208 | {
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209 | while(garbage_first[i])
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210 | {
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211 | struct cs_garbage *next = garbage_first[i]->next;
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212 | NULLFREE(garbage_first[i]->data);
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213 | NULLFREE(garbage_first[i]);
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214 | garbage_first[i] = next;
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215 | }
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216 | }
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217 |
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218 | for(i = 0; i < HASH_BUCKETS; ++i)
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219 | {
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220 | cs_writeunlock(__func__, &garbage_lock[i]);
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221 | cs_lock_destroy(__func__, &garbage_lock[i]);
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222 | }
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223 |
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224 | pthread_mutex_destroy(&add_lock);
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225 | pthread_cond_destroy(&sleep_cond);
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226 | pthread_mutex_destroy(&sleep_cond_mutex);
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227 | }
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228 | }
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