0
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10
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11
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18
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12 #if (NGX_TEST_BUILD_EPOLL)
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0
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13
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14 /* epoll declarations */
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15
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16 #define EPOLLIN 0x001
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17 #define EPOLLPRI 0x002
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18 #define EPOLLOUT 0x004
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19 #define EPOLLRDNORM 0x040
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20 #define EPOLLRDBAND 0x080
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21 #define EPOLLWRNORM 0x100
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22 #define EPOLLWRBAND 0x200
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23 #define EPOLLMSG 0x400
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24 #define EPOLLERR 0x008
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25 #define EPOLLHUP 0x010
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26
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27 #define EPOLLET 0x80000000
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28 #define EPOLLONESHOT 0x40000000
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29
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30 #define EPOLL_CTL_ADD 1
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31 #define EPOLL_CTL_DEL 2
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32 #define EPOLL_CTL_MOD 3
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33
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34 typedef union epoll_data {
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35 void *ptr;
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36 int fd;
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37 uint32_t u32;
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38 uint64_t u64;
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39 } epoll_data_t;
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40
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41 struct epoll_event {
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42 uint32_t events;
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43 epoll_data_t data;
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44 };
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45
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46 int epoll_create(int size);
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47 int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event);
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48 int epoll_wait(int epfd, struct epoll_event *events, int nevents, int timeout);
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49
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50 int epoll_create(int size)
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51 {
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52 return -1;
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53 }
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54
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55 int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event)
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56 {
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57 return -1;
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58 }
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59
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60 int epoll_wait(int epfd, struct epoll_event *events, int nevents, int timeout)
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61 {
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62 return -1;
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63 }
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64
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65 #endif
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66
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67
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68 typedef struct {
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69 u_int events;
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70 } ngx_epoll_conf_t;
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71
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72
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73 static int ngx_epoll_init(ngx_cycle_t *cycle);
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74 static void ngx_epoll_done(ngx_cycle_t *cycle);
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75 static int ngx_epoll_add_event(ngx_event_t *ev, int event, u_int flags);
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76 static int ngx_epoll_del_event(ngx_event_t *ev, int event, u_int flags);
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77 static int ngx_epoll_add_connection(ngx_connection_t *c);
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78 static int ngx_epoll_del_connection(ngx_connection_t *c, u_int flags);
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79 static int ngx_epoll_process_events(ngx_cycle_t *cycle);
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80
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81 static void *ngx_epoll_create_conf(ngx_cycle_t *cycle);
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82 static char *ngx_epoll_init_conf(ngx_cycle_t *cycle, void *conf);
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83
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84 static int ep = -1;
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85 static struct epoll_event *event_list;
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86 static u_int nevents;
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87
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88
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89 static ngx_str_t epoll_name = ngx_string("epoll");
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90
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91 static ngx_command_t ngx_epoll_commands[] = {
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92
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93 {ngx_string("epoll_events"),
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94 NGX_EVENT_CONF|NGX_CONF_TAKE1,
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95 ngx_conf_set_num_slot,
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96 0,
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97 offsetof(ngx_epoll_conf_t, events),
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98 NULL},
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99
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100 ngx_null_command
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101 };
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102
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103
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104 ngx_event_module_t ngx_epoll_module_ctx = {
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105 &epoll_name,
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106 ngx_epoll_create_conf, /* create configuration */
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107 ngx_epoll_init_conf, /* init configuration */
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108
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109 {
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110 ngx_epoll_add_event, /* add an event */
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111 ngx_epoll_del_event, /* delete an event */
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112 ngx_epoll_add_event, /* enable an event */
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113 ngx_epoll_del_event, /* disable an event */
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114 ngx_epoll_add_connection, /* add an connection */
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115 ngx_epoll_del_connection, /* delete an connection */
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116 NULL, /* process the changes */
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117 ngx_epoll_process_events, /* process the events */
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118 ngx_epoll_init, /* init the events */
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119 ngx_epoll_done, /* done the events */
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120 }
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121 };
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122
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123 ngx_module_t ngx_epoll_module = {
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124 NGX_MODULE,
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125 &ngx_epoll_module_ctx, /* module context */
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126 ngx_epoll_commands, /* module directives */
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127 NGX_EVENT_MODULE, /* module type */
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128 NULL, /* init module */
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129 NULL /* init process */
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130 };
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131
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132
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133 static int ngx_epoll_init(ngx_cycle_t *cycle)
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134 {
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135 size_t n;
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136 ngx_event_conf_t *ecf;
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137 ngx_epoll_conf_t *epcf;
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138
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139 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
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140
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141 epcf = ngx_event_get_conf(cycle->conf_ctx, ngx_epoll_module);
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142
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143 if (ep == -1) {
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144 ep = epoll_create(ecf->connections / 2);
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145
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146 if (ep == -1) {
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147 ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
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148 "epoll_create() failed");
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149 return NGX_ERROR;
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150 }
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151 }
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152
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153 if (nevents < epcf->events) {
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154 if (event_list) {
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155 ngx_free(event_list);
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156 }
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157
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158 event_list = ngx_alloc(sizeof(struct epoll_event) * epcf->events,
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159 cycle->log);
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160 if (event_list == NULL) {
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161 return NGX_ERROR;
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162 }
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163 }
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164
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165 nevents = epcf->events;
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166
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167 ngx_io = ngx_os_io;
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168
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169 ngx_event_actions = ngx_epoll_module_ctx.actions;
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170
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18
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171 #if (NGX_HAVE_CLEAR_EVENT)
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0
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172 ngx_event_flags = NGX_USE_CLEAR_EVENT
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173 #else
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174 ngx_event_flags = NGX_USE_LEVEL_EVENT
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175 #endif
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4
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176 |NGX_USE_GREEDY_EVENT
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0
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177 |NGX_USE_EPOLL_EVENT;
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178
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179 return NGX_OK;
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180 }
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181
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182
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183 static void ngx_epoll_done(ngx_cycle_t *cycle)
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184 {
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185 if (close(ep) == -1) {
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186 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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187 "epoll close() failed");
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188 }
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189
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190 ep = -1;
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191
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192 ngx_free(event_list);
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193
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194 event_list = NULL;
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195 nevents = 0;
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196 }
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197
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198
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199 static int ngx_epoll_add_event(ngx_event_t *ev, int event, u_int flags)
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200 {
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32
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201 int op;
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202 uint32_t events, prev;
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0
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203 ngx_event_t *e;
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204 ngx_connection_t *c;
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205 struct epoll_event ee;
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206
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207 c = ev->data;
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208
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32
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209 events = (uint32_t) event;
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210
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0
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211 if (event == NGX_READ_EVENT) {
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212 e = c->write;
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213 prev = EPOLLOUT;
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214 #if (NGX_READ_EVENT != EPOLLIN)
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32
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215 events = EPOLLIN;
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0
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216 #endif
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217
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218 } else {
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219 e = c->read;
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220 prev = EPOLLIN;
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221 #if (NGX_WRITE_EVENT != EPOLLOUT)
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32
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222 events = EPOLLOUT;
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0
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223 #endif
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224 }
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225
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226 if (e->active) {
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227 op = EPOLL_CTL_MOD;
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32
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228 events |= prev;
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0
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229
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230 } else {
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231 op = EPOLL_CTL_ADD;
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232 }
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233
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32
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234 ee.events = events | flags;
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30
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235 ee.data.u64 = (uintptr_t) c | ev->instance;
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0
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236
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237 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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238 "epoll add event: fd:%d op:%d ev:%08XD",
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0
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239 c->fd, op, ee.events);
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240
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241 if (epoll_ctl(ep, op, c->fd, &ee) == -1) {
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242 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
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243 "epoll_ctl(%d, %d) failed", op, c->fd);
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244 return NGX_ERROR;
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245 }
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246
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247 ev->active = 1;
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248 #if 0
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249 ev->oneshot = (flags & NGX_ONESHOT_EVENT) ? 1 : 0;
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250 #endif
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251
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252 return NGX_OK;
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253 }
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254
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255
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256 static int ngx_epoll_del_event(ngx_event_t *ev, int event, u_int flags)
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257 {
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32
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258 int op;
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259 uint32_t prev;
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0
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260 ngx_event_t *e;
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261 ngx_connection_t *c;
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262 struct epoll_event ee;
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263
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264 /*
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32
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265 * when the file descriptor is closed, the epoll automatically deletes
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266 * it from its queue, so we do not need to delete explicity the event
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0
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267 * before the closing the file descriptor
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268 */
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269
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270 if (flags & NGX_CLOSE_EVENT) {
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271 ev->active = 0;
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272 return NGX_OK;
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273 }
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274
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275 c = ev->data;
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276
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277 if (event == NGX_READ_EVENT) {
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278 e = c->write;
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279 prev = EPOLLOUT;
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280
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281 } else {
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282 e = c->read;
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283 prev = EPOLLIN;
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284 }
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285
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286 if (e->active) {
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287 op = EPOLL_CTL_MOD;
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288 ee.events = prev | flags;
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30
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289 ee.data.u64 = (uintptr_t) c | ev->instance;
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0
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290
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291 } else {
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292 op = EPOLL_CTL_DEL;
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293 ee.events = 0;
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294 ee.data.ptr = NULL;
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295 }
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296
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297 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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298 "epoll del event: fd:%d op:%d ev:%08XD",
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0
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299 c->fd, op, ee.events);
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300
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301 if (epoll_ctl(ep, op, c->fd, &ee) == -1) {
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302 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
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303 "epoll_ctl(%d, %d) failed", op, c->fd);
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304 return NGX_ERROR;
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305 }
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306
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307 ev->active = 0;
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308
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309 return NGX_OK;
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310 }
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311
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312
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313 static int ngx_epoll_add_connection(ngx_connection_t *c)
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314 {
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315 struct epoll_event ee;
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316
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317 ee.events = EPOLLIN|EPOLLOUT|EPOLLET;
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30
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318 ee.data.u64 = (uintptr_t) c | c->read->instance;
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0
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319
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320 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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10
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321 "epoll add connection: fd:%d ev:%08XD", c->fd, ee.events);
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0
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322
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323 if (epoll_ctl(ep, EPOLL_CTL_ADD, c->fd, &ee) == -1) {
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324 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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325 "epoll_ctl(EPOLL_CTL_ADD, %d) failed", c->fd);
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326 return NGX_ERROR;
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327 }
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328
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329 c->read->active = 1;
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330 c->write->active = 1;
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331
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332 return NGX_OK;
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333 }
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334
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335
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336 static int ngx_epoll_del_connection(ngx_connection_t *c, u_int flags)
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337 {
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338 int op;
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339 struct epoll_event ee;
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340
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341 /*
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342 * when the file descriptor is closed the epoll automatically deletes
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343 * it from its queue so we do not need to delete explicity the event
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344 * before the closing the file descriptor
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345 */
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346
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347 if (flags & NGX_CLOSE_EVENT) {
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348 c->read->active = 0;
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349 c->write->active = 0;
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350 return NGX_OK;
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351 }
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352
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353 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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354 "epoll del connection: fd:%d", c->fd);
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355
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356 op = EPOLL_CTL_DEL;
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357 ee.events = 0;
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30
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358 ee.data.u64 = 0;
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0
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359
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360 if (epoll_ctl(ep, op, c->fd, &ee) == -1) {
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361 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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362 "epoll_ctl(%d, %d) failed", op, c->fd);
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363 return NGX_ERROR;
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364 }
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365
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366 c->read->active = 0;
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367 c->write->active = 0;
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368
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369 return NGX_OK;
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370 }
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371
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372
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373 int ngx_epoll_process_events(ngx_cycle_t *cycle)
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374 {
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375 int events;
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376 size_t n;
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32
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377 uint32_t revents;
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0
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378 ngx_int_t instance, i;
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379 ngx_uint_t lock, accept_lock, expire;
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380 ngx_err_t err;
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381 ngx_log_t *log;
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382 ngx_msec_t timer;
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383 ngx_event_t *rev, *wev;
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384 struct timeval tv;
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385 ngx_connection_t *c;
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386 ngx_epoch_msec_t delta;
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387
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388 for ( ;; ) {
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389 timer = ngx_event_find_timer();
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390
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391 #if (NGX_THREADS)
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392
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393 if (timer == NGX_TIMER_ERROR) {
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394 return NGX_ERROR;
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395 }
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396
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397 if (timer == NGX_TIMER_INFINITE || timer > 500) {
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398 timer = 500;
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399 break;
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400 }
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401
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402 #endif
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403
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404 if (timer != 0) {
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405 break;
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406 }
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407
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408 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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409 "epoll expired timer");
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410
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411 ngx_event_expire_timers((ngx_msec_t)
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412 (ngx_elapsed_msec - ngx_old_elapsed_msec));
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413
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414 if (ngx_posted_events && ngx_threaded) {
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415 ngx_wakeup_worker_thread(cycle);
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416 }
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417 }
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418
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419 /* NGX_TIMER_INFINITE == INFTIM */
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420
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421 if (timer == NGX_TIMER_INFINITE) {
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422 expire = 0;
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423
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424 } else {
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425 expire = 1;
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426 }
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427
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428 ngx_old_elapsed_msec = ngx_elapsed_msec;
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429 accept_lock = 0;
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430
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431 if (ngx_accept_mutex) {
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432 if (ngx_accept_disabled > 0) {
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433 ngx_accept_disabled--;
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434
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435 } else {
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436 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
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437 return NGX_ERROR;
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438 }
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439
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440 if (ngx_accept_mutex_held) {
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441 accept_lock = 1;
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442
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443 } else if (timer == NGX_TIMER_INFINITE
|
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444 || timer > ngx_accept_mutex_delay)
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445 {
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446 timer = ngx_accept_mutex_delay;
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447 expire = 0;
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448 }
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449 }
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450 }
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451
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452 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
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453 "epoll timer: %d", timer);
|
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454
|
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455 events = epoll_wait(ep, event_list, nevents, timer);
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456
|
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457 if (events == -1) {
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458 err = ngx_errno;
|
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459 } else {
|
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460 err = 0;
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461 }
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462
|
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463 ngx_gettimeofday(&tv);
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464 ngx_time_update(tv.tv_sec);
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465
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466 delta = ngx_elapsed_msec;
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467 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
|
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468 + tv.tv_usec / 1000 - ngx_start_msec;
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469
|
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470 if (timer != NGX_TIMER_INFINITE) {
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471 delta = ngx_elapsed_msec - delta;
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472
|
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473 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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474 "epoll timer: %d, delta: %d", timer, (int) delta);
|
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475 } else {
|
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476 if (events == 0) {
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477 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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478 "epoll_wait() returned no events without timeout");
|
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479 ngx_accept_mutex_unlock();
|
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480 return NGX_ERROR;
|
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481 }
|
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482 }
|
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483
|
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484 if (err) {
|
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485 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
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486 cycle->log, err, "epoll_wait() failed");
|
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487 ngx_accept_mutex_unlock();
|
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488 return NGX_ERROR;
|
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489 }
|
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490
|
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491 if (events > 0) {
|
|
492 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
493 ngx_accept_mutex_unlock();
|
|
494 return NGX_ERROR;
|
|
495 }
|
|
496
|
|
497 lock = 1;
|
|
498
|
|
499 } else {
|
|
500 lock =0;
|
|
501 }
|
|
502
|
|
503 log = cycle->log;
|
|
504
|
|
505 for (i = 0; i < events; i++) {
|
|
506 c = event_list[i].data.ptr;
|
|
507
|
|
508 instance = (uintptr_t) c & 1;
|
|
509 c = (ngx_connection_t *) ((uintptr_t) c & (uintptr_t) ~1);
|
|
510
|
|
511 rev = c->read;
|
|
512
|
|
513 if (c->fd == -1 || rev->instance != instance) {
|
|
514
|
|
515 /*
|
|
516 * the stale event from a file descriptor
|
|
517 * that was just closed in this iteration
|
|
518 */
|
|
519
|
|
520 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
10
|
521 "epoll: stale event %p", c);
|
0
|
522 continue;
|
|
523 }
|
|
524
|
|
525 #if (NGX_DEBUG0)
|
|
526 log = c->log ? c->log : cycle->log;
|
|
527 #endif
|
|
528
|
32
|
529 revents = event_list[i].events;
|
|
530
|
0
|
531 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0,
|
10
|
532 "epoll: fd:%d ev:%04XD d:%p",
|
32
|
533 c->fd, revents, event_list[i].data);
|
0
|
534
|
32
|
535 if (revents & (EPOLLERR|EPOLLHUP)) {
|
0
|
536 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, log, 0,
|
10
|
537 "epoll_wait() error on fd:%d ev:%04XD",
|
32
|
538 c->fd, revents);
|
|
539 }
|
|
540
|
|
541 if (revents & ~(EPOLLIN|EPOLLOUT|EPOLLERR|EPOLLHUP)) {
|
|
542 ngx_log_error(NGX_LOG_ALERT, log, 0,
|
|
543 "strange epoll_wait() events fd:%d ev:%04XD",
|
|
544 c->fd, revents);
|
0
|
545 }
|
|
546
|
32
|
547 if ((revents & (EPOLLERR|EPOLLHUP))
|
|
548 && (revents & (EPOLLIN|EPOLLOUT)) == 0)
|
|
549 {
|
|
550 /*
|
|
551 * if the error events were returned without EPOLLIN or EPOLLOUT,
|
|
552 * then add these flags to handle the events at least in one
|
|
553 * active handler
|
|
554 */
|
|
555
|
|
556 revents |= EPOLLIN|EPOLLOUT;
|
0
|
557 }
|
|
558
|
|
559 wev = c->write;
|
|
560
|
32
|
561 if ((revents & EPOLLOUT) && wev->active) {
|
|
562
|
0
|
563 if (ngx_threaded) {
|
|
564 wev->posted_ready = 1;
|
|
565 ngx_post_event(wev);
|
|
566
|
|
567 } else {
|
|
568 wev->ready = 1;
|
|
569
|
|
570 if (!ngx_accept_mutex_held) {
|
|
571 wev->event_handler(wev);
|
|
572
|
|
573 } else {
|
|
574 ngx_post_event(wev);
|
|
575 }
|
|
576 }
|
|
577 }
|
|
578
|
|
579 /*
|
|
580 * EPOLLIN must be handled after EPOLLOUT because we use
|
|
581 * the optimization to avoid the unnecessary mutex locking/unlocking
|
|
582 * if the accept event is the last one.
|
|
583 */
|
|
584
|
32
|
585 if ((revents & EPOLLIN) && rev->active) {
|
|
586
|
0
|
587 if (ngx_threaded && !rev->accept) {
|
|
588 rev->posted_ready = 1;
|
|
589
|
|
590 ngx_post_event(rev);
|
|
591
|
|
592 continue;
|
|
593 }
|
|
594
|
|
595 rev->ready = 1;
|
|
596
|
|
597 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
598 rev->event_handler(rev);
|
|
599
|
|
600 } else if (!rev->accept) {
|
|
601 ngx_post_event(rev);
|
|
602
|
|
603 } else if (ngx_accept_disabled <= 0) {
|
|
604
|
|
605 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
606
|
|
607 rev->event_handler(rev);
|
|
608
|
|
609 if (ngx_accept_disabled > 0) {
|
|
610 ngx_accept_mutex_unlock();
|
|
611 accept_lock = 0;
|
|
612 }
|
|
613
|
|
614 if (i + 1 == events) {
|
|
615 lock = 0;
|
|
616 break;
|
|
617 }
|
|
618
|
|
619 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
620 if (accept_lock) {
|
|
621 ngx_accept_mutex_unlock();
|
|
622 }
|
|
623 return NGX_ERROR;
|
|
624 }
|
|
625 }
|
|
626 }
|
|
627 }
|
|
628
|
|
629 if (accept_lock) {
|
|
630 ngx_accept_mutex_unlock();
|
|
631 }
|
|
632
|
|
633 if (lock) {
|
|
634 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
635 }
|
|
636
|
|
637 if (expire && delta) {
|
|
638 ngx_event_expire_timers((ngx_msec_t) delta);
|
|
639 }
|
|
640
|
|
641 if (ngx_posted_events) {
|
|
642 if (ngx_threaded) {
|
|
643 ngx_wakeup_worker_thread(cycle);
|
|
644
|
|
645 } else {
|
|
646 ngx_event_process_posted(cycle);
|
|
647 }
|
|
648 }
|
|
649
|
|
650 return NGX_OK;
|
|
651 }
|
|
652
|
|
653
|
|
654 static void *ngx_epoll_create_conf(ngx_cycle_t *cycle)
|
|
655 {
|
|
656 ngx_epoll_conf_t *epcf;
|
|
657
|
|
658 ngx_test_null(epcf, ngx_palloc(cycle->pool, sizeof(ngx_epoll_conf_t)),
|
|
659 NGX_CONF_ERROR);
|
|
660
|
|
661 epcf->events = NGX_CONF_UNSET;
|
|
662
|
|
663 return epcf;
|
|
664 }
|
|
665
|
|
666
|
|
667 static char *ngx_epoll_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
668 {
|
|
669 ngx_epoll_conf_t *epcf = conf;
|
|
670
|
|
671 ngx_conf_init_unsigned_value(epcf->events, 512);
|
|
672
|
|
673 return NGX_CONF_OK;
|
|
674 }
|