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annotate src/http/ngx_http_cache.h @ 3440:88741ec7731a stable-0.7

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merge r3294, r3305: Fix a bug introduced in r2032: After a child process has read a terminate message from a channel, the process tries to read the channel again. The kernel (at least FreeBSD) may preempt the process and sends a SIGIO signal to a master process. The master process sends a new terminate message, the kernel switches again to the the child process, and the child process reads the messages instead of an EAGAIN error. And this may repeat over and over. Being that the child process can not exit the cycle and test the termination flag set by the message handler. The fix disallow the master process to send a new terminate message on SIGIO signal reception. It may send the message only on SIGALARM signal.
author Igor Sysoev <igor@sysoev.ru>
date Mon, 01 Feb 2010 15:49:36 +0000
parents 1f3cd08ebb82
children 0d8b8c84bab7
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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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16 #define NGX_HTTP_CACHE_MISS 1
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17 #define NGX_HTTP_CACHE_EXPIRED 2
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18 #define NGX_HTTP_CACHE_STALE 3
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19 #define NGX_HTTP_CACHE_UPDATING 4
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20 #define NGX_HTTP_CACHE_HIT 5
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22 #define NGX_HTTP_CACHE_KEY_LEN 16
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25 typedef struct {
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26 ngx_uint_t status;
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27 time_t valid;
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28 } ngx_http_cache_valid_t;
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29
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31 typedef struct {
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32 ngx_rbtree_node_t node;
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33 ngx_queue_t queue;
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34
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35 u_char key[NGX_HTTP_CACHE_KEY_LEN
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36 - sizeof(ngx_rbtree_key_t)];
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37
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38 unsigned count:20;
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39 unsigned uses:10;
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40 unsigned valid_msec:10;
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41 unsigned error:10;
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42 unsigned exists:1;
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43 unsigned updating:1;
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44 /* 12 unused bits */
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45
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46 ngx_file_uniq_t uniq;
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47 time_t expire;
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48 time_t valid_sec;
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49 size_t body_start;
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50 off_t length;
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51 } ngx_http_file_cache_node_t;
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52
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53
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54 struct ngx_http_cache_s {
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55 ngx_file_t file;
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56 ngx_array_t keys;
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57 uint32_t crc32;
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58 u_char key[NGX_HTTP_CACHE_KEY_LEN];
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59
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60 ngx_file_uniq_t uniq;
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61 time_t valid_sec;
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62 time_t last_modified;
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63 time_t date;
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64
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65 size_t header_start;
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66 size_t body_start;
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67 off_t length;
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68
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69 ngx_uint_t min_uses;
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70 ngx_uint_t error;
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71 ngx_uint_t valid_msec;
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72
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73 ngx_buf_t *buf;
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74
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75 ngx_http_file_cache_t *file_cache;
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76 ngx_http_file_cache_node_t *node;
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77
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78 unsigned updated:1;
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79 unsigned exists:1;
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80 unsigned temp_file:1;
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81 };
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83
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84 typedef struct {
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85 time_t valid_sec;
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86 time_t last_modified;
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87 time_t date;
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88 uint32_t crc32;
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89 u_short valid_msec;
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90 u_short header_start;
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91 u_short body_start;
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92 } ngx_http_file_cache_header_t;
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94
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95 typedef struct {
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96 ngx_rbtree_t rbtree;
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97 ngx_rbtree_node_t sentinel;
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98 ngx_queue_t queue;
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99 ngx_atomic_t cold;
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100 ngx_atomic_t loading;
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101 off_t size;
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102 } ngx_http_file_cache_sh_t;
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103
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104
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105 struct ngx_http_file_cache_s {
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106 ngx_http_file_cache_sh_t *sh;
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107 ngx_slab_pool_t *shpool;
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108
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109 ngx_path_t *path;
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110
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111 off_t max_size;
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112 size_t bsize;
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113
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114 time_t inactive;
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115
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116 ngx_msec_t last;
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117 ngx_uint_t files;
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118
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119 ngx_shm_zone_t *shm_zone;
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120 };
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121
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122
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123 void ngx_http_file_cache_create_key(ngx_http_request_t *r);
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124 ngx_int_t ngx_http_file_cache_open(ngx_http_request_t *r);
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125 void ngx_http_file_cache_set_header(ngx_http_request_t *r, u_char *buf);
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126 void ngx_http_file_cache_update(ngx_http_request_t *r, ngx_temp_file_t *tf);
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127 ngx_int_t ngx_http_cache_send(ngx_http_request_t *);
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128 void ngx_http_file_cache_free(ngx_http_request_t *r, ngx_temp_file_t *tf);
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129 time_t ngx_http_file_cache_valid(ngx_array_t *cache_valid, ngx_uint_t status);
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130
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131 char *ngx_http_file_cache_set_slot(ngx_conf_t *cf, ngx_command_t *cmd,
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132 void *conf);
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133 char *ngx_http_file_cache_valid_set_slot(ngx_conf_t *cf, ngx_command_t *cmd,
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134 void *conf);
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2ff194b74f1e nginx-0.1.9-RELEASE import
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135
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136 extern ngx_str_t ngx_http_cache_status[];
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137
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a65b630b3a66 nginx-0.0.1-2003-11-28-11:40:40 import
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138
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c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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139 #endif /* _NGX_HTTP_CACHE_H_INCLUDED_ */