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