0
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9
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10
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50
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11 ngx_pool_t *
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12 ngx_create_pool(size_t size, ngx_log_t *log)
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0
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13 {
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14 ngx_pool_t *p;
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15
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50
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16 p = ngx_alloc(size, log);
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17 if (p == NULL) {
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0
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18 return NULL;
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19 }
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20
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34
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21 p->last = (u_char *) p + sizeof(ngx_pool_t);
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22 p->end = (u_char *) p + size;
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0
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23 p->next = NULL;
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24 p->large = NULL;
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56
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25 p->chain = NULL;
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0
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26 p->log = log;
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27
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28 return p;
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29 }
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30
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31
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50
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32 void
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33 ngx_destroy_pool(ngx_pool_t *pool)
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0
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34 {
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35 ngx_pool_t *p, *n;
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36 ngx_pool_large_t *l;
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37
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38 for (l = pool->large; l; l = l->next) {
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39
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10
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40 ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, pool->log, 0, "free: %p", l->alloc);
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0
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41
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42 if (l->alloc) {
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26
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43 ngx_free(l->alloc);
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0
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44 }
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45 }
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46
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47 #if (NGX_DEBUG)
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48
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49 /*
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50 * we could allocate the pool->log from this pool
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51 * so we can not use this log while the free()ing the pool
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52 */
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53
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54 for (p = pool, n = pool->next; /* void */; p = n, n = n->next) {
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55 ngx_log_debug2(NGX_LOG_DEBUG_ALLOC, pool->log, 0,
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10
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56 "free: %p, unused: %uz", p, p->end - p->last);
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0
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57
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58 if (n == NULL) {
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59 break;
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60 }
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61 }
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62
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63 #endif
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64
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65 for (p = pool, n = pool->next; /* void */; p = n, n = n->next) {
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26
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66 ngx_free(p);
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0
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67
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68 if (n == NULL) {
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69 break;
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70 }
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71 }
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72 }
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73
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74
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50
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75 void *
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76 ngx_palloc(ngx_pool_t *pool, size_t size)
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0
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77 {
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34
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78 u_char *m;
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0
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79 ngx_pool_t *p, *n;
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80 ngx_pool_large_t *large, *last;
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81
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82 if (size <= (size_t) NGX_MAX_ALLOC_FROM_POOL
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34
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83 && size <= (size_t) (pool->end - (u_char *) pool)
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2
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84 - (size_t) ngx_align(sizeof(ngx_pool_t)))
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0
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85 {
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86 for (p = pool, n = pool->next; /* void */; p = n, n = n->next) {
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87 m = ngx_align(p->last);
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88
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89 if ((size_t) (p->end - m) >= size) {
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2
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90 p->last = m + size;
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0
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91
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92 return m;
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93 }
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94
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95 if (n == NULL) {
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96 break;
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97 }
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98 }
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99
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100 /* allocate a new pool block */
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101
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50
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102 n = ngx_create_pool((size_t) (p->end - (u_char *) p), p->log);
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103 if (n == NULL) {
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0
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104 return NULL;
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105 }
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106
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107 p->next = n;
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2
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108 m = ngx_align(n->last);
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109 n->last = m + size;
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0
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110
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111 return m;
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112 }
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113
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114 /* allocate a large block */
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115
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116 large = NULL;
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117 last = NULL;
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118
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119 if (pool->large) {
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120 for (last = pool->large; /* void */ ; last = last->next) {
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121 if (last->alloc == NULL) {
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122 large = last;
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123 last = NULL;
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124 break;
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125 }
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126
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127 if (last->next == NULL) {
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128 break;
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129 }
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130 }
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131 }
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132
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133 if (large == NULL) {
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50
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134 large = ngx_palloc(pool, sizeof(ngx_pool_large_t));
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135 if (large == NULL) {
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0
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136 return NULL;
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137 }
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138
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139 large->next = NULL;
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140 }
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141
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142 #if 0
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143 p = ngx_memalign(ngx_pagesize, size, pool->log);
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144 if (p == NULL) {
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0
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145 return NULL;
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146 }
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147 #else
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50
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148 p = ngx_alloc(size, pool->log);
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149 if (p == NULL) {
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0
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150 return NULL;
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151 }
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152 #endif
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153
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154 if (pool->large == NULL) {
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155 pool->large = large;
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156
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157 } else if (last) {
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158 last->next = large;
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159 }
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160
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161 large->alloc = p;
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162
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163 return p;
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164 }
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165
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166
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50
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167 ngx_int_t
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168 ngx_pfree(ngx_pool_t *pool, void *p)
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0
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169 {
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170 ngx_pool_large_t *l;
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171
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172 for (l = pool->large; l; l = l->next) {
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173 if (p == l->alloc) {
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174 ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, pool->log, 0,
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10
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175 "free: %p", l->alloc);
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26
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176 ngx_free(l->alloc);
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0
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177 l->alloc = NULL;
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178
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179 return NGX_OK;
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180 }
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181 }
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182
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183 return NGX_DECLINED;
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184 }
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185
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186
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50
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187 void *
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188 ngx_pcalloc(ngx_pool_t *pool, size_t size)
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0
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189 {
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190 void *p;
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191
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192 p = ngx_palloc(pool, size);
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193 if (p) {
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194 ngx_memzero(p, size);
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195 }
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196
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197 return p;
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198 }
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199
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200 #if 0
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201
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50
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202 static void *
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203 ngx_get_cached_block(size_t size)
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0
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204 {
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205 void *p;
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206 ngx_cached_block_slot_t *slot;
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207
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208 if (ngx_cycle->cache == NULL) {
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209 return NULL;
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210 }
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211
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212 slot = &ngx_cycle->cache[(size + ngx_pagesize - 1) / ngx_pagesize];
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213
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214 slot->tries++;
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215
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216 if (slot->number) {
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217 p = slot->block;
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218 slot->block = slot->block->next;
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219 slot->number--;
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220 return p;
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221 }
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222
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223 return NULL;
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224 }
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225
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226 #endif
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