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annotate src/http/ngx_http_cache.h @ 6733:adc2414856b1

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Modules compatibility: compatibility with NGX_THREADS. With this change it is now possible to load modules compiled without the "--with-threads" configure option into nginx binary compiled with it, and vice versa (if a module does not use thread-specific functions), assuming both use the "--with-compat" option.
author Maxim Dounin <mdounin@mdounin.ru>
date Mon, 10 Oct 2016 18:44:17 +0300
parents ca709bca4b77
children 1a917932db96
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 * Copyright (C) Nginx, Inc.
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5 */
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8 #ifndef _NGX_HTTP_CACHE_H_INCLUDED_
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9 #define _NGX_HTTP_CACHE_H_INCLUDED_
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12 #include <ngx_config.h>
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13 #include <ngx_core.h>
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14 #include <ngx_http.h>
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16
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17 #define NGX_HTTP_CACHE_MISS 1
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18 #define NGX_HTTP_CACHE_BYPASS 2
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19 #define NGX_HTTP_CACHE_EXPIRED 3
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20 #define NGX_HTTP_CACHE_STALE 4
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21 #define NGX_HTTP_CACHE_UPDATING 5
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22 #define NGX_HTTP_CACHE_REVALIDATED 6
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23 #define NGX_HTTP_CACHE_HIT 7
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24 #define NGX_HTTP_CACHE_SCARCE 8
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25
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26 #define NGX_HTTP_CACHE_KEY_LEN 16
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27 #define NGX_HTTP_CACHE_ETAG_LEN 42
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28 #define NGX_HTTP_CACHE_VARY_LEN 42
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29
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30 #define NGX_HTTP_CACHE_VERSION 3
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33 typedef struct {
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34 ngx_uint_t status;
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35 time_t valid;
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36 } ngx_http_cache_valid_t;
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37
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38
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39 typedef struct {
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40 ngx_rbtree_node_t node;
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41 ngx_queue_t queue;
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42
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43 u_char key[NGX_HTTP_CACHE_KEY_LEN
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44 - sizeof(ngx_rbtree_key_t)];
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45
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46 unsigned count:20;
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47 unsigned uses:10;
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48 unsigned valid_msec:10;
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49 unsigned error:10;
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50 unsigned exists:1;
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51 unsigned updating:1;
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52 unsigned deleting:1;
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53 unsigned purged:1;
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54 /* 10 unused bits */
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55
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56 ngx_file_uniq_t uniq;
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57 time_t expire;
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58 time_t valid_sec;
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59 size_t body_start;
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60 off_t fs_size;
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61 ngx_msec_t lock_time;
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62 } ngx_http_file_cache_node_t;
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63
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64
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65 struct ngx_http_cache_s {
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66 ngx_file_t file;
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67 ngx_array_t keys;
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68 uint32_t crc32;
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69 u_char key[NGX_HTTP_CACHE_KEY_LEN];
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70 u_char main[NGX_HTTP_CACHE_KEY_LEN];
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71
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72 ngx_file_uniq_t uniq;
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73 time_t valid_sec;
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74 time_t last_modified;
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75 time_t date;
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76
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77 ngx_str_t etag;
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78 ngx_str_t vary;
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79 u_char variant[NGX_HTTP_CACHE_KEY_LEN];
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80
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81 size_t header_start;
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82 size_t body_start;
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83 off_t length;
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84 off_t fs_size;
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85
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86 ngx_uint_t min_uses;
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87 ngx_uint_t error;
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88 ngx_uint_t valid_msec;
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89 ngx_uint_t vary_tag;
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90
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91 ngx_buf_t *buf;
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92
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93 ngx_http_file_cache_t *file_cache;
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94 ngx_http_file_cache_node_t *node;
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95
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96 #if (NGX_THREADS || NGX_COMPAT)
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97 ngx_thread_task_t *thread_task;
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98 #endif
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99
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100 ngx_msec_t lock_timeout;
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101 ngx_msec_t lock_age;
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102 ngx_msec_t lock_time;
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103 ngx_msec_t wait_time;
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104
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105 ngx_event_t wait_event;
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106
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107 unsigned lock:1;
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108 unsigned waiting:1;
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109
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110 unsigned updated:1;
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111 unsigned updating:1;
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112 unsigned exists:1;
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113 unsigned temp_file:1;
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114 unsigned purged:1;
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115 unsigned reading:1;
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116 unsigned secondary:1;
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117 };
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119
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120 typedef struct {
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121 ngx_uint_t version;
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122 time_t valid_sec;
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123 time_t last_modified;
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124 time_t date;
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125 uint32_t crc32;
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126 u_short valid_msec;
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127 u_short header_start;
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128 u_short body_start;
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129 u_char etag_len;
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130 u_char etag[NGX_HTTP_CACHE_ETAG_LEN];
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131 u_char vary_len;
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132 u_char vary[NGX_HTTP_CACHE_VARY_LEN];
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diff changeset
133 u_char variant[NGX_HTTP_CACHE_KEY_LEN];
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134 } ngx_http_file_cache_header_t;
477
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parents: 473
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135
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Igor Sysoev <igor@sysoev.ru>
parents: 473
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136
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Igor Sysoev <igor@sysoev.ru>
parents: 2616
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137 typedef struct {
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Igor Sysoev <igor@sysoev.ru>
parents: 2616
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138 ngx_rbtree_t rbtree;
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Igor Sysoev <igor@sysoev.ru>
parents: 2616
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139 ngx_rbtree_node_t sentinel;
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Igor Sysoev <igor@sysoev.ru>
parents: 2616
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140 ngx_queue_t queue;
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Igor Sysoev <igor@sysoev.ru>
parents: 2616
diff changeset
141 ngx_atomic_t cold;
3018
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Igor Sysoev <igor@sysoev.ru>
parents: 2952
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142 ngx_atomic_t loading;
2720
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Igor Sysoev <igor@sysoev.ru>
parents: 2616
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143 off_t size;
6445
c9d680b00744 Cache: added watermark to reduce IO load when keys_zone is full.
Dmitry Volyntsev <xeioex@nginx.com>
parents: 6444
diff changeset
144 ngx_uint_t count;
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Dmitry Volyntsev <xeioex@nginx.com>
parents: 6444
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145 ngx_uint_t watermark;
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parents: 2616
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146 } ngx_http_file_cache_sh_t;
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147
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parents: 2616
diff changeset
148
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diff changeset
149 struct ngx_http_file_cache_s {
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150 ngx_http_file_cache_sh_t *sh;
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151 ngx_slab_pool_t *shpool;
469
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Igor Sysoev <igor@sysoev.ru>
parents: 444
diff changeset
152
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Igor Sysoev <igor@sysoev.ru>
parents: 477
diff changeset
153 ngx_path_t *path;
5968
99639bfdfa2a Cache: added temp_path to file cache.
Roman Arutyunyan <arut@nginx.com>
parents: 5960
diff changeset
154 ngx_path_t *temp_path;
201
267ea1d98683 nginx-0.0.1-2003-11-30-23:03:18 import
Igor Sysoev <igor@sysoev.ru>
parents: 200
diff changeset
155
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parents: 2592
diff changeset
156 off_t max_size;
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diff changeset
157 size_t bsize;
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diff changeset
158
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diff changeset
159 time_t inactive;
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parents: 2592
diff changeset
160
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Dmitry Volyntsev <xeioex@nginx.com>
parents: 6063
diff changeset
161 time_t fail_time;
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Dmitry Volyntsev <xeioex@nginx.com>
parents: 6063
diff changeset
162
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Igor Sysoev <igor@sysoev.ru>
parents: 3899
diff changeset
163 ngx_uint_t files;
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Igor Sysoev <igor@sysoev.ru>
parents: 3899
diff changeset
164 ngx_uint_t loader_files;
2616
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Igor Sysoev <igor@sysoev.ru>
parents: 2592
diff changeset
165 ngx_msec_t last;
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Igor Sysoev <igor@sysoev.ru>
parents: 3899
diff changeset
166 ngx_msec_t loader_sleep;
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Igor Sysoev <igor@sysoev.ru>
parents: 3899
diff changeset
167 ngx_msec_t loader_threshold;
201
267ea1d98683 nginx-0.0.1-2003-11-30-23:03:18 import
Igor Sysoev <igor@sysoev.ru>
parents: 200
diff changeset
168
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Dmitry Volyntsev <xeioex@nginx.com>
parents: 6709
diff changeset
169 ngx_uint_t manager_files;
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parents: 6709
diff changeset
170 ngx_msec_t manager_sleep;
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parents: 6709
diff changeset
171 ngx_msec_t manager_threshold;
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parents: 6709
diff changeset
172
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parents: 477
diff changeset
173 ngx_shm_zone_t *shm_zone;
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Igor Sysoev <igor@sysoev.ru>
parents: 477
diff changeset
174 };
200
abeaebe0a33c nginx-0.0.1-2003-11-28-20:41:47 import
Igor Sysoev <igor@sysoev.ru>
parents: 199
diff changeset
175
197
0b81c7a0b133 nginx-0.0.1-2003-11-27-10:45:22 import
Igor Sysoev <igor@sysoev.ru>
parents: 195
diff changeset
176
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Igor Sysoev <igor@sysoev.ru>
parents: 3697
diff changeset
177 ngx_int_t ngx_http_file_cache_new(ngx_http_request_t *r);
3699
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Igor Sysoev <igor@sysoev.ru>
parents: 3698
diff changeset
178 ngx_int_t ngx_http_file_cache_create(ngx_http_request_t *r);
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parents: 477
diff changeset
179 void ngx_http_file_cache_create_key(ngx_http_request_t *r);
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parents: 477
diff changeset
180 ngx_int_t ngx_http_file_cache_open(ngx_http_request_t *r);
5959
f7584d7c0ccb Cache: update variant while setting header.
Valentin Bartenev <vbart@nginx.com>
parents: 5905
diff changeset
181 ngx_int_t ngx_http_file_cache_set_header(ngx_http_request_t *r, u_char *buf);
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parents: 477
diff changeset
182 void ngx_http_file_cache_update(ngx_http_request_t *r, ngx_temp_file_t *tf);
5441
43ccaf8e8728 Upstream: cache revalidation with conditional requests.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4412
diff changeset
183 void ngx_http_file_cache_update_header(ngx_http_request_t *r);
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parents: 477
diff changeset
184 ngx_int_t ngx_http_cache_send(ngx_http_request_t *);
3711
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Igor Sysoev <igor@sysoev.ru>
parents: 3699
diff changeset
185 void ngx_http_file_cache_free(ngx_http_cache_t *c, ngx_temp_file_t *tf);
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diff changeset
186 time_t ngx_http_file_cache_valid(ngx_array_t *cache_valid, ngx_uint_t status);
199
a65b630b3a66 nginx-0.0.1-2003-11-28-11:40:40 import
Igor Sysoev <igor@sysoev.ru>
parents: 197
diff changeset
187
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Igor Sysoev <igor@sysoev.ru>
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diff changeset
188 char *ngx_http_file_cache_set_slot(ngx_conf_t *cf, ngx_command_t *cmd,
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Igor Sysoev <igor@sysoev.ru>
parents: 477
diff changeset
189 void *conf);
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Igor Sysoev <igor@sysoev.ru>
parents: 477
diff changeset
190 char *ngx_http_file_cache_valid_set_slot(ngx_conf_t *cf, ngx_command_t *cmd,
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Igor Sysoev <igor@sysoev.ru>
parents: 477
diff changeset
191 void *conf);
469
2ff194b74f1e nginx-0.1.9-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents: 444
diff changeset
192
3526
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Igor Sysoev <igor@sysoev.ru>
parents: 3052
diff changeset
193
2952
0998606fbfd4 $upstream_cache_status
Igor Sysoev <igor@sysoev.ru>
parents: 2927
diff changeset
194 extern ngx_str_t ngx_http_cache_status[];
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Igor Sysoev <igor@sysoev.ru>
parents: 2927
diff changeset
195
199
a65b630b3a66 nginx-0.0.1-2003-11-28-11:40:40 import
Igor Sysoev <igor@sysoev.ru>
parents: 197
diff changeset
196
170
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
197 #endif /* _NGX_HTTP_CACHE_H_INCLUDED_ */