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annotate src/http/ngx_http_cache.h @ 3755:76e3a93821b1

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fix race condition if during reconfiguration two cache managers try to delete old inactive entries: one of them removes a entry just locked by other manager from the queue and the rbtree as long inactive entry, causes the latter manager to segfault leaving cache mutex locked, the bug has been introduced in r3727
author Igor Sysoev <igor@sysoev.ru>
date Thu, 02 Sep 2010 14:31:47 +0000
parents ce6ba077c270
children e7cd13b7f759
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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7 #ifndef _NGX_HTTP_CACHE_H_INCLUDED_
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8 #define _NGX_HTTP_CACHE_H_INCLUDED_
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11 #include <ngx_config.h>
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12 #include <ngx_core.h>
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13 #include <ngx_http.h>
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15
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16 #define NGX_HTTP_CACHE_MISS 1
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17 #define NGX_HTTP_CACHE_BYPASS 2
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18 #define NGX_HTTP_CACHE_EXPIRED 3
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19 #define NGX_HTTP_CACHE_STALE 4
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20 #define NGX_HTTP_CACHE_UPDATING 5
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21 #define NGX_HTTP_CACHE_HIT 6
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22 #define NGX_HTTP_CACHE_SCARCE 7
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24 #define NGX_HTTP_CACHE_KEY_LEN 16
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27 typedef struct {
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28 ngx_uint_t status;
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29 time_t valid;
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30 } ngx_http_cache_valid_t;
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31
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32
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33 typedef struct {
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34 ngx_rbtree_node_t node;
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35 ngx_queue_t queue;
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36
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37 u_char key[NGX_HTTP_CACHE_KEY_LEN
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38 - sizeof(ngx_rbtree_key_t)];
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39
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40 unsigned count:20;
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41 unsigned uses:10;
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42 unsigned valid_msec:10;
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43 unsigned error:10;
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44 unsigned exists:1;
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45 unsigned updating:1;
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46 unsigned deleting:1;
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47 /* 11 unused bits */
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48
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49 ngx_file_uniq_t uniq;
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50 time_t expire;
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51 time_t valid_sec;
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52 size_t body_start;
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53 off_t length;
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54 } ngx_http_file_cache_node_t;
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55
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56
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57 struct ngx_http_cache_s {
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58 ngx_file_t file;
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59 ngx_array_t keys;
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60 uint32_t crc32;
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61 u_char key[NGX_HTTP_CACHE_KEY_LEN];
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62
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63 ngx_file_uniq_t uniq;
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64 time_t valid_sec;
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65 time_t last_modified;
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66 time_t date;
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67
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68 size_t header_start;
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69 size_t body_start;
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70 off_t length;
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71
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72 ngx_uint_t min_uses;
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73 ngx_uint_t error;
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74 ngx_uint_t valid_msec;
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75
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76 ngx_buf_t *buf;
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77
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78 ngx_http_file_cache_t *file_cache;
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79 ngx_http_file_cache_node_t *node;
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80
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81 unsigned updated:1;
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82 unsigned updating:1;
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83 unsigned exists:1;
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84 unsigned temp_file:1;
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85 };
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87
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88 typedef struct {
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89 time_t valid_sec;
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90 time_t last_modified;
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91 time_t date;
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92 uint32_t crc32;
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93 u_short valid_msec;
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94 u_short header_start;
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95 u_short body_start;
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96 } ngx_http_file_cache_header_t;
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97
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98
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99 typedef struct {
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100 ngx_rbtree_t rbtree;
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101 ngx_rbtree_node_t sentinel;
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102 ngx_queue_t queue;
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103 ngx_atomic_t cold;
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104 ngx_atomic_t loading;
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105 off_t size;
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106 } ngx_http_file_cache_sh_t;
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107
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108
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109 struct ngx_http_file_cache_s {
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110 ngx_http_file_cache_sh_t *sh;
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111 ngx_slab_pool_t *shpool;
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112
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113 ngx_path_t *path;
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114
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115 off_t max_size;
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116 size_t bsize;
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117
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118 time_t inactive;
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119
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120 ngx_msec_t last;
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121 ngx_uint_t files;
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122
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123 ngx_shm_zone_t *shm_zone;
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124 };
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125
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126
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127 ngx_int_t ngx_http_file_cache_new(ngx_http_request_t *r);
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128 ngx_int_t ngx_http_file_cache_create(ngx_http_request_t *r);
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129 void ngx_http_file_cache_create_key(ngx_http_request_t *r);
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130 ngx_int_t ngx_http_file_cache_open(ngx_http_request_t *r);
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131 void ngx_http_file_cache_set_header(ngx_http_request_t *r, u_char *buf);
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132 void ngx_http_file_cache_update(ngx_http_request_t *r, ngx_temp_file_t *tf);
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133 ngx_int_t ngx_http_cache_send(ngx_http_request_t *);
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134 void ngx_http_file_cache_free(ngx_http_cache_t *c, ngx_temp_file_t *tf);
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135 time_t ngx_http_file_cache_valid(ngx_array_t *cache_valid, ngx_uint_t status);
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136
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137 char *ngx_http_file_cache_set_slot(ngx_conf_t *cf, ngx_command_t *cmd,
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138 void *conf);
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139 char *ngx_http_file_cache_valid_set_slot(ngx_conf_t *cf, ngx_command_t *cmd,
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140 void *conf);
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141
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142
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0998606fbfd4 $upstream_cache_status
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143 extern ngx_str_t ngx_http_cache_status[];
0998606fbfd4 $upstream_cache_status
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144
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a65b630b3a66 nginx-0.0.1-2003-11-28-11:40:40 import
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145
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c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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146 #endif /* _NGX_HTTP_CACHE_H_INCLUDED_ */