Mercurial > hg > nginx
annotate src/core/ngx_slab.c @ 1645:31622d9f2c0d
the simple expression has the same precision without overflow
author | Igor Sysoev <igor@sysoev.ru> |
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date | Fri, 16 Nov 2007 18:15:04 +0000 |
parents | 06306a20b8bb |
children | b794d78e52c5 |
rev | line source |
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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 #include <ngx_config.h> |
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7 #include <ngx_core.h> |
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8 |
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9 /* |
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10 |
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11 12 |
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12 2048 2 11 |
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13 1024 4 10 |
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14 512 8 9 |
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15 256 16 8 |
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16 |
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17 128 32 4 32 7 |
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18 |
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19 64 64 8 63 6 1 |
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20 32 128 16 127 5 1 |
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21 16 256 32 254 4 2 |
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22 8 512 64 504 3 8 |
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23 |
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24 */ |
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25 |
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26 |
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27 #define NGX_SLAB_PAGE_MASK 3 |
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28 #define NGX_SLAB_PAGE 0 |
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29 #define NGX_SLAB_BIG 1 |
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30 #define NGX_SLAB_EXACT 2 |
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31 #define NGX_SLAB_SMALL 3 |
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32 |
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33 #if (NGX_PTR_SIZE == 4) |
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34 |
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35 #define NGX_SLAB_PAGE_FREE 0 |
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36 #define NGX_SLAB_PAGE_BUSY 0xffffffff |
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37 #define NGX_SLAB_PAGE_START 0x80000000 |
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38 |
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39 #define NGX_SLAB_SHIFT_MASK 0x0000000f |
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40 #define NGX_SLAB_MAP_MASK 0xffff0000 |
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41 #define NGX_SLAB_MAP_SHIFT 16 |
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42 |
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43 #define NGX_SLAB_BUSY 0xffffffff |
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44 |
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45 #else /* (NGX_PTR_SIZE == 8) */ |
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46 |
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47 #define NGX_SLAB_PAGE_FREE 0 |
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48 #define NGX_SLAB_PAGE_BUSY 0xffffffffffffffff |
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49 #define NGX_SLAB_PAGE_START 0x8000000000000000 |
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50 |
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51 #define NGX_SLAB_SHIFT_MASK 0x000000000000000f |
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52 #define NGX_SLAB_MAP_MASK 0xffffffff00000000 |
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53 #define NGX_SLAB_MAP_SHIFT 32 |
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54 |
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55 #define NGX_SLAB_BUSY 0xffffffffffffffff |
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56 |
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57 #endif |
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58 |
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59 |
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60 #if (NGX_DEBUG_MALLOC) |
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61 #define ngx_slab_junk(p, size) ngx_memset(p, 0xD0, size) |
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62 #else |
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63 #define ngx_slab_junk(p, size) |
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64 #endif |
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65 |
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66 static ngx_slab_page_t *ngx_slab_alloc_pages(ngx_slab_pool_t *pool, |
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67 ngx_uint_t pages); |
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68 static void ngx_slab_free_pages(ngx_slab_pool_t *pool, ngx_slab_page_t *page, |
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69 ngx_uint_t pages); |
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70 |
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71 |
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72 static ngx_uint_t ngx_slab_max_size; |
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73 static ngx_uint_t ngx_slab_exact_size; |
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74 static ngx_uint_t ngx_slab_exact_shift; |
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75 |
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76 |
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77 void |
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78 ngx_slab_init(ngx_slab_pool_t *pool) |
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79 { |
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80 u_char *p; |
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81 size_t size; |
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82 ngx_int_t m; |
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83 ngx_uint_t i, n, pages; |
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84 ngx_slab_page_t *slots; |
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85 |
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86 /* STUB */ |
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87 if (ngx_slab_max_size == 0) { |
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88 ngx_slab_max_size = ngx_pagesize / 2; |
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89 ngx_slab_exact_size = ngx_pagesize / (8 * sizeof(uintptr_t)); |
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90 for (n = ngx_slab_exact_size; n >>= 1; ngx_slab_exact_shift++) { |
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91 /* void */ |
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92 } |
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93 } |
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94 /**/ |
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95 |
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96 pool->min_size = 1 << pool->min_shift; |
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97 |
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98 p = (u_char *) pool + sizeof(ngx_slab_pool_t); |
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99 size = pool->end - p; |
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100 |
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101 ngx_slab_junk(p, size); |
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102 |
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103 slots = (ngx_slab_page_t *) p; |
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104 n = ngx_pagesize_shift - pool->min_shift; |
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105 |
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106 for (i = 0; i < n; i++) { |
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107 slots[i].slab = 0; |
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108 slots[i].next = &slots[i]; |
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109 slots[i].prev = 0; |
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110 } |
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111 |
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112 p += n * sizeof(ngx_slab_page_t); |
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113 |
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114 pages = (ngx_uint_t) (size / (ngx_pagesize + sizeof(ngx_slab_page_t))); |
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115 |
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116 ngx_memzero(p, pages * sizeof(ngx_slab_page_t)); |
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117 |
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118 pool->pages = (ngx_slab_page_t *) p; |
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119 |
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120 pool->free.prev = 0; |
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121 pool->free.next = (ngx_slab_page_t *) p; |
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122 |
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123 pool->pages->slab = pages; |
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124 pool->pages->next = &pool->free; |
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125 pool->pages->prev = (uintptr_t) &pool->free; |
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126 |
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127 pool->start = (u_char *) |
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128 ngx_align_ptr((uintptr_t) p + pages * sizeof(ngx_slab_page_t), |
860
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129 ngx_pagesize); |
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130 |
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131 m = pages - (pool->end - pool->start) / ngx_pagesize; |
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132 if (m > 0) { |
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133 pages -= m; |
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134 pool->pages->slab = pages; |
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135 } |
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136 |
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137 #if 0 |
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138 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0, "slab: %p, %p, %ui, %d", |
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139 pool, pool->start, pages, |
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140 (pool->end - pool->start) / ngx_pagesize - pages); |
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141 #endif |
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142 } |
357
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nginx-0.0.7-2004-06-16-23:36:07 import
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143 |
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144 |
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145 void * |
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146 ngx_slab_alloc(ngx_slab_pool_t *pool, size_t size) |
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147 { |
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148 void *p; |
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149 |
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150 ngx_shmtx_lock(&pool->mutex); |
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151 |
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152 p = ngx_slab_alloc_locked(pool, size); |
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153 |
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154 ngx_shmtx_unlock(&pool->mutex); |
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155 |
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156 return p; |
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157 } |
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158 |
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159 |
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160 void * |
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161 ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size) |
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162 { |
860
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163 size_t s; |
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164 uintptr_t p, n, m, mask, *bitmap; |
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165 ngx_uint_t i, slot, shift, map; |
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166 ngx_slab_page_t *page, *prev, *slots; |
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167 |
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168 if (size >= ngx_slab_max_size) { |
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169 |
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170 ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, ngx_cycle->log, 0, |
967 | 171 "slab alloc: %uz", size); |
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172 |
860
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173 page = ngx_slab_alloc_pages(pool, (size + ngx_pagesize - 1) |
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174 >> ngx_pagesize_shift); |
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175 if (page) { |
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176 p = (page - pool->pages) << ngx_pagesize_shift; |
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177 p += (uintptr_t) pool->start; |
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178 |
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179 } else { |
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180 p = 0; |
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181 } |
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182 |
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183 goto done; |
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184 } |
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185 |
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186 if (size > pool->min_size) { |
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187 shift = 1; |
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188 for (s = size - 1; s >>= 1; shift++) { /* void */ } |
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189 slot = shift - pool->min_shift; |
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190 |
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191 } else { |
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192 size = pool->min_size; |
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193 shift = pool->min_shift; |
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194 slot = 0; |
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195 } |
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196 |
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197 ngx_log_debug2(NGX_LOG_DEBUG_ALLOC, ngx_cycle->log, 0, |
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198 "slab alloc: %uz slot: %ui", size, slot); |
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199 |
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200 slots = (ngx_slab_page_t *) ((u_char *) pool + sizeof(ngx_slab_pool_t)); |
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201 page = slots[slot].next; |
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202 |
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203 if (page->next != page) { |
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|
204 |
966
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diff
changeset
|
205 if (shift < ngx_slab_exact_shift) { |
860
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206 |
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207 do { |
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208 p = (page - pool->pages) << ngx_pagesize_shift; |
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209 bitmap = (uintptr_t *) (pool->start + p); |
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210 |
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211 map = (1 << (ngx_pagesize_shift - shift)) |
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212 / (sizeof(uintptr_t) * 8); |
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213 |
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214 for (n = 0; n < map; n++) { |
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215 |
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216 if (bitmap[n] != NGX_SLAB_BUSY) { |
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217 |
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218 for (m = 1, i = 0; m; m <<= 1, i++) { |
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219 if ((bitmap[n] & m)) { |
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220 continue; |
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221 } |
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222 |
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223 bitmap[n] |= m; |
966
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224 |
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225 i = ((n * sizeof(uintptr_t) * 8) << shift) |
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226 + (i << shift); |
860
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|
227 |
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228 if (bitmap[n] == NGX_SLAB_BUSY) { |
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229 for (n = n + 1; n < map; n++) { |
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230 if (bitmap[n] != NGX_SLAB_BUSY) { |
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231 p = (uintptr_t) bitmap + i; |
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232 |
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233 goto done; |
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|
234 } |
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235 } |
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236 |
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237 prev = (ngx_slab_page_t *) |
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238 (page->prev & ~NGX_SLAB_PAGE_MASK); |
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239 prev->next = page->next; |
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240 page->next->prev = page->prev; |
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|
241 |
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242 page->next = NULL; |
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243 page->prev = NGX_SLAB_SMALL; |
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244 } |
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245 |
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246 p = (uintptr_t) bitmap + i; |
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247 |
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248 goto done; |
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249 } |
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250 } |
201d017ea470
slab allocator in shared memory
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|
251 } |
201d017ea470
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|
252 |
201d017ea470
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|
253 page = page->next; |
201d017ea470
slab allocator in shared memory
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|
254 |
201d017ea470
slab allocator in shared memory
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|
255 } while (page); |
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|
256 |
966
715336c243e1
many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
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parents:
881
diff
changeset
|
257 } else if (shift == ngx_slab_exact_shift) { |
860
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|
258 |
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slab allocator in shared memory
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|
259 do { |
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slab allocator in shared memory
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|
260 if (page->slab != NGX_SLAB_BUSY) { |
201d017ea470
slab allocator in shared memory
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|
261 |
201d017ea470
slab allocator in shared memory
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|
262 for (m = 1, i = 0; m; m <<= 1, i++) { |
201d017ea470
slab allocator in shared memory
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parents:
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diff
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|
263 if ((page->slab & m)) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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|
264 continue; |
201d017ea470
slab allocator in shared memory
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|
265 } |
201d017ea470
slab allocator in shared memory
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|
266 |
201d017ea470
slab allocator in shared memory
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diff
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|
267 page->slab |= m; |
201d017ea470
slab allocator in shared memory
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|
268 |
201d017ea470
slab allocator in shared memory
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|
269 if (page->slab == NGX_SLAB_BUSY) { |
201d017ea470
slab allocator in shared memory
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parents:
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diff
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|
270 prev = (ngx_slab_page_t *) |
201d017ea470
slab allocator in shared memory
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|
271 (page->prev & ~NGX_SLAB_PAGE_MASK); |
201d017ea470
slab allocator in shared memory
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parents:
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diff
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|
272 prev->next = page->next; |
201d017ea470
slab allocator in shared memory
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parents:
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|
273 page->next->prev = page->prev; |
201d017ea470
slab allocator in shared memory
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|
274 |
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|
275 page->next = NULL; |
201d017ea470
slab allocator in shared memory
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|
276 page->prev = NGX_SLAB_EXACT; |
201d017ea470
slab allocator in shared memory
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|
277 } |
201d017ea470
slab allocator in shared memory
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|
278 |
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slab allocator in shared memory
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|
279 p = (page - pool->pages) << ngx_pagesize_shift; |
201d017ea470
slab allocator in shared memory
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|
280 p += i << shift; |
201d017ea470
slab allocator in shared memory
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|
281 p += (uintptr_t) pool->start; |
201d017ea470
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|
282 |
201d017ea470
slab allocator in shared memory
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|
283 goto done; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
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|
284 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
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|
285 } |
201d017ea470
slab allocator in shared memory
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|
286 |
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slab allocator in shared memory
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|
287 page = page->next; |
201d017ea470
slab allocator in shared memory
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|
288 |
201d017ea470
slab allocator in shared memory
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|
289 } while (page); |
201d017ea470
slab allocator in shared memory
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|
290 |
966
715336c243e1
many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents:
881
diff
changeset
|
291 } else { /* shift > ngx_slab_exact_shift */ |
860
201d017ea470
slab allocator in shared memory
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|
292 |
201d017ea470
slab allocator in shared memory
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|
293 n = ngx_pagesize_shift - (page->slab & NGX_SLAB_SHIFT_MASK); |
201d017ea470
slab allocator in shared memory
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|
294 n = 1 << n; |
1016
d0e8c81d3bb7
fix slab allocator on 64-bit platfroms
Igor Sysoev <igor@sysoev.ru>
parents:
967
diff
changeset
|
295 n = ((uintptr_t) 1 << n) - 1; |
860
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
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diff
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|
296 mask = n << NGX_SLAB_MAP_SHIFT; |
201d017ea470
slab allocator in shared memory
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|
297 |
201d017ea470
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|
298 do { |
201d017ea470
slab allocator in shared memory
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|
299 if ((page->slab & NGX_SLAB_MAP_MASK) != mask) { |
201d017ea470
slab allocator in shared memory
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|
300 |
881
5ed08a4c3bd3
fix building on 64-bit platforms
Igor Sysoev <igor@sysoev.ru>
parents:
860
diff
changeset
|
301 for (m = (uintptr_t) 1 << NGX_SLAB_MAP_SHIFT, i = 0; |
860
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
302 m & mask; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
303 m <<= 1, i++) |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
304 { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
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|
305 if ((page->slab & m)) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
306 continue; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
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diff
changeset
|
307 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
308 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
309 page->slab |= m; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
310 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
311 if ((page->slab & NGX_SLAB_MAP_MASK) == mask) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
312 prev = (ngx_slab_page_t *) |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
313 (page->prev & ~NGX_SLAB_PAGE_MASK); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
314 prev->next = page->next; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
315 page->next->prev = page->prev; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
316 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
317 page->next = NULL; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
318 page->prev = NGX_SLAB_BIG; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
319 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
320 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
321 p = (page - pool->pages) << ngx_pagesize_shift; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
322 p += i << shift; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
323 p += (uintptr_t) pool->start; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
324 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
325 goto done; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
326 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
327 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
328 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
329 page = page->next; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
330 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
331 } while (page); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
332 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
333 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
334 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
335 page = ngx_slab_alloc_pages(pool, 1); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
336 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
337 if (page) { |
966
715336c243e1
many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents:
881
diff
changeset
|
338 if (shift < ngx_slab_exact_shift) { |
860
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
339 p = (page - pool->pages) << ngx_pagesize_shift; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
340 bitmap = (uintptr_t *) (pool->start + p); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
341 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
342 s = 1 << shift; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
343 n = (1 << (ngx_pagesize_shift - shift)) / 8 / s; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
344 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
345 if (n == 0) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
346 n = 1; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
347 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
348 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
349 bitmap[0] = (2 << n) - 1; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
350 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
351 map = (1 << (ngx_pagesize_shift - shift)) / (sizeof(uintptr_t) * 8); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
352 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
353 for (i = 1; i < map; i++) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
354 bitmap[i] = 0; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
355 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
356 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
357 page->slab = shift; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
358 page->next = &slots[slot]; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
359 page->prev = (uintptr_t) &slots[slot] | NGX_SLAB_SMALL; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
360 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
361 slots[slot].next = page; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
362 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
363 p = ((page - pool->pages) << ngx_pagesize_shift) + s * n; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
364 p += (uintptr_t) pool->start; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
365 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
366 goto done; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
367 |
966
715336c243e1
many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents:
881
diff
changeset
|
368 } else if (shift == ngx_slab_exact_shift) { |
860
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
369 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
370 page->slab = 1; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
371 page->next = &slots[slot]; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
372 page->prev = (uintptr_t) &slots[slot] | NGX_SLAB_EXACT; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
373 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
374 slots[slot].next = page; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
375 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
376 p = (page - pool->pages) << ngx_pagesize_shift; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
377 p += (uintptr_t) pool->start; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
378 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
379 goto done; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
380 |
966
715336c243e1
many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents:
881
diff
changeset
|
381 } else { /* shift > ngx_slab_exact_shift */ |
860
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
382 |
881
5ed08a4c3bd3
fix building on 64-bit platforms
Igor Sysoev <igor@sysoev.ru>
parents:
860
diff
changeset
|
383 page->slab = ((uintptr_t) 1 << NGX_SLAB_MAP_SHIFT) | shift; |
860
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
384 page->next = &slots[slot]; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
385 page->prev = (uintptr_t) &slots[slot] | NGX_SLAB_BIG; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
386 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
387 slots[slot].next = page; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
388 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
389 p = (page - pool->pages) << ngx_pagesize_shift; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
390 p += (uintptr_t) pool->start; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
391 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
392 goto done; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
393 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
394 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
395 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
396 p = 0; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
397 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
398 done: |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
399 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
400 ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, ngx_cycle->log, 0, "slab alloc: %p", p); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
401 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
402 return (void *) p; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
403 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
404 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
405 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
406 void |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
407 ngx_slab_free(ngx_slab_pool_t *pool, void *p) |
357
e260514b9ad4
nginx-0.0.7-2004-06-16-23:36:07 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
408 { |
966
715336c243e1
many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents:
881
diff
changeset
|
409 ngx_shmtx_lock(&pool->mutex); |
715336c243e1
many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents:
881
diff
changeset
|
410 |
715336c243e1
many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents:
881
diff
changeset
|
411 ngx_slab_free_locked(pool, p); |
715336c243e1
many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents:
881
diff
changeset
|
412 |
715336c243e1
many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents:
881
diff
changeset
|
413 ngx_shmtx_unlock(&pool->mutex); |
715336c243e1
many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents:
881
diff
changeset
|
414 } |
715336c243e1
many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents:
881
diff
changeset
|
415 |
715336c243e1
many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents:
881
diff
changeset
|
416 |
715336c243e1
many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents:
881
diff
changeset
|
417 void |
715336c243e1
many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents:
881
diff
changeset
|
418 ngx_slab_free_locked(ngx_slab_pool_t *pool, void *p) |
715336c243e1
many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents:
881
diff
changeset
|
419 { |
860
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
420 size_t size; |
1018
06306a20b8bb
fix slab allocator on 64-bit platfroms
Igor Sysoev <igor@sysoev.ru>
parents:
1016
diff
changeset
|
421 uintptr_t slab, m, *bitmap; |
06306a20b8bb
fix slab allocator on 64-bit platfroms
Igor Sysoev <igor@sysoev.ru>
parents:
1016
diff
changeset
|
422 ngx_uint_t n, type, slot, shift, map; |
860
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
423 ngx_slab_page_t *slots, *page; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
424 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
425 ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, ngx_cycle->log, 0, "slab free: %p", p); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
426 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
427 if ((u_char *) p < pool->start || (u_char *) p > pool->end) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
428 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0, |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
429 "ngx_slab_free(): outside of pool"); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
430 goto fail; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
431 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
432 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
433 n = ((u_char *) p - pool->start) >> ngx_pagesize_shift; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
434 page = &pool->pages[n]; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
435 slab = page->slab; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
436 type = page->prev & NGX_SLAB_PAGE_MASK; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
437 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
438 switch (type) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
439 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
440 case NGX_SLAB_SMALL: |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
441 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
442 shift = slab & NGX_SLAB_SHIFT_MASK; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
443 size = 1 << shift; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
444 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
445 if ((uintptr_t) p & (size - 1)) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
446 goto wrong_chunk; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
447 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
448 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
449 n = ((uintptr_t) p & (ngx_pagesize - 1)) >> shift; |
1016
d0e8c81d3bb7
fix slab allocator on 64-bit platfroms
Igor Sysoev <igor@sysoev.ru>
parents:
967
diff
changeset
|
450 m = (uintptr_t) 1 << (n & (sizeof(uintptr_t) * 8 - 1)); |
860
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
451 n /= (sizeof(uintptr_t) * 8); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
452 bitmap = (uintptr_t *) ((uintptr_t) p & ~(ngx_pagesize - 1)); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
453 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
454 if (bitmap[n] & m) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
455 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
456 if (page->next == NULL) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
457 slots = (ngx_slab_page_t *) |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
458 ((u_char *) pool + sizeof(ngx_slab_pool_t)); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
459 slot = shift - pool->min_shift; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
460 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
461 page->next = slots[slot].next; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
462 slots[slot].next = page; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
463 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
464 page->prev = (uintptr_t) &slots[slot] | NGX_SLAB_SMALL; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
465 page->next->prev = (uintptr_t) page | NGX_SLAB_SMALL; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
466 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
467 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
468 bitmap[n] &= ~m; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
469 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
470 n = (1 << (ngx_pagesize_shift - shift)) / 8 / (1 << shift); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
471 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
472 if (n == 0) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
473 n = 1; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
474 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
475 |
1016
d0e8c81d3bb7
fix slab allocator on 64-bit platfroms
Igor Sysoev <igor@sysoev.ru>
parents:
967
diff
changeset
|
476 if (bitmap[0] & ~(((uintptr_t) 1 << n) - 1)) { |
860
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
477 goto done; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
478 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
479 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
480 map = (1 << (ngx_pagesize_shift - shift)) / (sizeof(uintptr_t) * 8); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
481 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
482 for (n = 1; n < map; n++) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
483 if (bitmap[n]) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
484 goto done; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
485 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
486 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
487 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
488 ngx_slab_free_pages(pool, page, 1); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
489 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
490 goto done; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
491 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
492 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
493 goto chunk_already_free; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
494 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
495 case NGX_SLAB_EXACT: |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
496 |
1016
d0e8c81d3bb7
fix slab allocator on 64-bit platfroms
Igor Sysoev <igor@sysoev.ru>
parents:
967
diff
changeset
|
497 m = (uintptr_t) 1 << |
d0e8c81d3bb7
fix slab allocator on 64-bit platfroms
Igor Sysoev <igor@sysoev.ru>
parents:
967
diff
changeset
|
498 (((uintptr_t) p & (ngx_pagesize - 1)) >> ngx_slab_exact_shift); |
860
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
499 size = ngx_slab_exact_size; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
500 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
501 if ((uintptr_t) p & (size - 1)) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
502 goto wrong_chunk; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
503 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
504 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
505 if (slab & m) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
506 if (slab == NGX_SLAB_BUSY) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
507 slots = (ngx_slab_page_t *) |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
508 ((u_char *) pool + sizeof(ngx_slab_pool_t)); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
509 slot = ngx_slab_exact_shift - pool->min_shift; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
510 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
511 page->next = slots[slot].next; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
512 slots[slot].next = page; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
513 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
514 page->prev = (uintptr_t) &slots[slot] | NGX_SLAB_EXACT; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
515 page->next->prev = (uintptr_t) page | NGX_SLAB_EXACT; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
516 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
517 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
518 page->slab &= ~m; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
519 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
520 if (page->slab) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
521 goto done; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
522 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
523 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
524 ngx_slab_free_pages(pool, page, 1); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
525 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
526 goto done; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
527 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
528 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
529 goto chunk_already_free; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
530 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
531 case NGX_SLAB_BIG: |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
532 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
533 shift = slab & NGX_SLAB_SHIFT_MASK; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
534 size = 1 << shift; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
535 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
536 if ((uintptr_t) p & (size - 1)) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
537 goto wrong_chunk; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
538 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
539 |
1016
d0e8c81d3bb7
fix slab allocator on 64-bit platfroms
Igor Sysoev <igor@sysoev.ru>
parents:
967
diff
changeset
|
540 m = (uintptr_t) 1 << ((((uintptr_t) p & (ngx_pagesize - 1)) >> shift) |
d0e8c81d3bb7
fix slab allocator on 64-bit platfroms
Igor Sysoev <igor@sysoev.ru>
parents:
967
diff
changeset
|
541 + NGX_SLAB_MAP_SHIFT); |
860
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
542 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
543 if (slab & m) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
544 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
545 if (page->next == NULL) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
546 slots = (ngx_slab_page_t *) |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
547 ((u_char *) pool + sizeof(ngx_slab_pool_t)); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
548 slot = shift - pool->min_shift; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
549 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
550 page->next = slots[slot].next; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
551 slots[slot].next = page; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
552 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
553 page->prev = (uintptr_t) &slots[slot] | NGX_SLAB_BIG; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
554 page->next->prev = (uintptr_t) page | NGX_SLAB_BIG; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
555 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
556 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
557 page->slab &= ~m; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
558 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
559 if (page->slab & NGX_SLAB_MAP_MASK) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
560 goto done; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
561 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
562 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
563 ngx_slab_free_pages(pool, page, 1); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
564 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
565 goto done; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
566 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
567 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
568 goto chunk_already_free; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
569 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
570 case NGX_SLAB_PAGE: |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
571 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
572 if ((uintptr_t) p & (ngx_pagesize - 1)) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
573 goto wrong_chunk; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
574 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
575 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
576 if (slab == NGX_SLAB_PAGE_FREE) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
577 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0, |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
578 "ngx_slab_free(): page is already free"); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
579 goto fail; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
580 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
581 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
582 if (slab == NGX_SLAB_PAGE_BUSY) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
583 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0, |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
584 "ngx_slab_free(): pointer to wrong page"); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
585 goto fail; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
586 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
587 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
588 n = ((u_char *) p - pool->start) >> ngx_pagesize_shift; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
589 size = slab & ~NGX_SLAB_PAGE_START; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
590 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
591 ngx_slab_free_pages(pool, &pool->pages[n], size); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
592 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
593 size <<= ngx_pagesize_shift; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
594 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
595 goto done; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
596 } |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
597 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
598 /* not reached */ |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
599 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
600 return; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
601 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
602 done: |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
603 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
604 ngx_slab_junk(p, size); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
605 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
606 return; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
607 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
608 wrong_chunk: |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
609 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
610 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0, |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
611 "ngx_slab_free(): pointer to wrong chunk"); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
612 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
613 goto fail; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
614 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
615 chunk_already_free: |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
616 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
617 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0, |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
618 "ngx_slab_free(): chunk is already free"); |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
619 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
620 fail: |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
621 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
622 return; |
357
e260514b9ad4
nginx-0.0.7-2004-06-16-23:36:07 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
623 } |
860
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
624 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
625 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
626 static ngx_slab_page_t * |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
627 ngx_slab_alloc_pages(ngx_slab_pool_t *pool, ngx_uint_t pages) |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
628 { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
629 ngx_slab_page_t *page, *p; |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
630 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
631 for (page = pool->free.next; page != &pool->free; page = page->next) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
632 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
633 if (page->slab >= pages) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
634 |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
635 if (page->slab > pages) { |
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
826
diff
changeset
|
636 page[pages].slab = page->slab - pages; |
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637 page[pages].next = page->next; |
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638 page[pages].prev = page->prev; |
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639 |
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640 p = (ngx_slab_page_t *) page->prev; |
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641 p->next = &page[pages]; |
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642 page->next->prev = (uintptr_t) &page[pages]; |
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643 |
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644 } else { |
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645 p = (ngx_slab_page_t *) page->prev; |
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646 p->next = page->next; |
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647 page->next->prev = page->prev; |
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648 } |
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649 |
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650 page->slab = pages | NGX_SLAB_PAGE_START; |
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651 |
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652 #if (NGX_DEBUG) |
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653 page->next = NULL; |
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654 page->prev = NGX_SLAB_PAGE; |
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655 #endif |
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656 |
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657 if (--pages == 0) { |
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658 return page; |
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659 } |
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660 |
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661 for (p = page + 1; pages; pages--) { |
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662 p->slab = NGX_SLAB_PAGE_BUSY; |
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663 #if (NGX_DEBUG) |
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664 p->next = NULL; |
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665 p->prev = NGX_SLAB_PAGE; |
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666 #endif |
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667 p++; |
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668 } |
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669 |
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670 return page; |
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671 } |
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672 } |
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673 |
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674 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, NGX_ENOMEM, |
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675 "ngx_slab_alloc(): failed"); |
966
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many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
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parents:
881
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676 |
860
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677 return NULL; |
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678 } |
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679 |
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680 |
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681 static void |
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682 ngx_slab_free_pages(ngx_slab_pool_t *pool, ngx_slab_page_t *page, |
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683 ngx_uint_t pages) |
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684 { |
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685 ngx_slab_page_t *prev; |
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686 |
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687 page->slab = pages--; |
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688 |
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689 if (pages) { |
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690 ngx_memzero(&page[1], pages * sizeof(ngx_slab_page_t)); |
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691 } |
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692 |
966
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693 if (page->next) { |
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694 prev = (ngx_slab_page_t *) (page->prev & ~NGX_SLAB_PAGE_MASK); |
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695 prev->next = page->next; |
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Igor Sysoev <igor@sysoev.ru>
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696 page->next->prev = page->prev; |
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Igor Sysoev <igor@sysoev.ru>
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697 } |
860
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698 |
966
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many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
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881
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|
699 page->prev = (uintptr_t) &pool->free; |
860
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700 page->next = pool->free.next; |
966
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many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents:
881
diff
changeset
|
701 |
715336c243e1
many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
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|
702 page->next->prev = (uintptr_t) page; |
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many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
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|
703 |
860
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704 pool->free.next = page; |
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705 } |