0
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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644
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4 * Copyright (C) Nginx, Inc.
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0
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_event.h>
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11
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12
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112
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13 static ngx_int_t ngx_select_init(ngx_cycle_t *cycle, ngx_msec_t timer);
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0
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14 static void ngx_select_done(ngx_cycle_t *cycle);
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324
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15 static ngx_int_t ngx_select_add_event(ngx_event_t *ev, ngx_int_t event,
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16 ngx_uint_t flags);
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17 static ngx_int_t ngx_select_del_event(ngx_event_t *ev, ngx_int_t event,
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18 ngx_uint_t flags);
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112
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19 static ngx_int_t ngx_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
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20 ngx_uint_t flags);
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484
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21 static void ngx_select_repair_fd_sets(ngx_cycle_t *cycle);
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0
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22 static char *ngx_select_init_conf(ngx_cycle_t *cycle, void *conf);
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23
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24
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25 static fd_set master_read_fd_set;
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26 static fd_set master_write_fd_set;
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27 static fd_set work_read_fd_set;
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28 static fd_set work_write_fd_set;
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29
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324
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30 static ngx_int_t max_fd;
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0
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31 static ngx_uint_t nevents;
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32
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33 static ngx_event_t **event_index;
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34
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35
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36 static ngx_str_t select_name = ngx_string("select");
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37
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38 ngx_event_module_t ngx_select_module_ctx = {
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39 &select_name,
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40 NULL, /* create configuration */
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41 ngx_select_init_conf, /* init configuration */
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42
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43 {
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44 ngx_select_add_event, /* add an event */
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45 ngx_select_del_event, /* delete an event */
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46 ngx_select_add_event, /* enable an event */
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47 ngx_select_del_event, /* disable an event */
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48 NULL, /* add an connection */
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49 NULL, /* delete an connection */
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50 NULL, /* process the changes */
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51 ngx_select_process_events, /* process the events */
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52 ngx_select_init, /* init the events */
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53 ngx_select_done /* done the events */
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54 }
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55
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56 };
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57
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58 ngx_module_t ngx_select_module = {
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58
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59 NGX_MODULE_V1,
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0
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60 &ngx_select_module_ctx, /* module context */
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61 NULL, /* module directives */
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62 NGX_EVENT_MODULE, /* module type */
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90
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63 NULL, /* init master */
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0
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64 NULL, /* init module */
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90
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65 NULL, /* init process */
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66 NULL, /* init thread */
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67 NULL, /* exit thread */
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68 NULL, /* exit process */
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69 NULL, /* exit master */
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70 NGX_MODULE_V1_PADDING
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0
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71 };
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72
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73
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50
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74 static ngx_int_t
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112
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75 ngx_select_init(ngx_cycle_t *cycle, ngx_msec_t timer)
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0
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76 {
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77 ngx_event_t **index;
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78
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79 if (event_index == NULL) {
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80 FD_ZERO(&master_read_fd_set);
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81 FD_ZERO(&master_write_fd_set);
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82 nevents = 0;
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83 }
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84
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552
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85 if (ngx_process >= NGX_PROCESS_WORKER
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0
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86 || cycle->old_cycle == NULL
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87 || cycle->old_cycle->connection_n < cycle->connection_n)
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88 {
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50
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89 index = ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n,
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90 cycle->log);
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91 if (index == NULL) {
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92 return NGX_ERROR;
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93 }
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0
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94
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95 if (event_index) {
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96 ngx_memcpy(index, event_index, sizeof(ngx_event_t *) * nevents);
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97 ngx_free(event_index);
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98 }
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112
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99
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0
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100 event_index = index;
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101 }
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102
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103 ngx_io = ngx_os_io;
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104
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105 ngx_event_actions = ngx_select_module_ctx.actions;
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106
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112
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107 ngx_event_flags = NGX_USE_LEVEL_EVENT;
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0
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108
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109 max_fd = -1;
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110
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111 return NGX_OK;
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112 }
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113
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114
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50
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115 static void
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116 ngx_select_done(ngx_cycle_t *cycle)
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0
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117 {
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118 ngx_free(event_index);
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119
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120 event_index = NULL;
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121 }
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122
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123
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50
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124 static ngx_int_t
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324
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125 ngx_select_add_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
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0
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126 {
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127 ngx_connection_t *c;
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128
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129 c = ev->data;
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130
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131 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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324
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132 "select add event fd:%d ev:%i", c->fd, event);
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0
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133
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134 if (ev->index != NGX_INVALID_INDEX) {
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135 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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324
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136 "select event fd:%d ev:%i is already set", c->fd, event);
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0
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137 return NGX_OK;
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138 }
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139
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486
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140 if ((event == NGX_READ_EVENT && ev->write)
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141 || (event == NGX_WRITE_EVENT && !ev->write))
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142 {
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143 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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144 "invalid select %s event fd:%d ev:%i",
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145 ev->write ? "write" : "read", c->fd, event);
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146 return NGX_ERROR;
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147 }
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148
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0
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149 if (event == NGX_READ_EVENT) {
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150 FD_SET(c->fd, &master_read_fd_set);
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151
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152 } else if (event == NGX_WRITE_EVENT) {
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153 FD_SET(c->fd, &master_write_fd_set);
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154 }
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155
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156 if (max_fd != -1 && max_fd < c->fd) {
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157 max_fd = c->fd;
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158 }
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159
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160 ev->active = 1;
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161
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162 event_index[nevents] = ev;
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163 ev->index = nevents;
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164 nevents++;
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165
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166 return NGX_OK;
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167 }
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168
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169
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50
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170 static ngx_int_t
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324
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171 ngx_select_del_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
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0
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172 {
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486
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173 ngx_event_t *e;
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0
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174 ngx_connection_t *c;
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175
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176 c = ev->data;
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177
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178 ev->active = 0;
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179
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180 if (ev->index == NGX_INVALID_INDEX) {
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181 return NGX_OK;
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182 }
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183
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184 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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324
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185 "select del event fd:%d ev:%i", c->fd, event);
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0
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186
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187 if (event == NGX_READ_EVENT) {
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188 FD_CLR(c->fd, &master_read_fd_set);
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189
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190 } else if (event == NGX_WRITE_EVENT) {
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191 FD_CLR(c->fd, &master_write_fd_set);
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192 }
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193
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194 if (max_fd == c->fd) {
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195 max_fd = -1;
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196 }
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197
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324
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198 if (ev->index < --nevents) {
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486
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199 e = event_index[nevents];
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200 event_index[ev->index] = e;
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201 e->index = ev->index;
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0
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202 }
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203
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204 ev->index = NGX_INVALID_INDEX;
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205
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206 return NGX_OK;
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207 }
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208
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209
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50
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210 static ngx_int_t
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112
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211 ngx_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
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212 ngx_uint_t flags)
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0
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213 {
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484
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214 int ready, nready;
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215 ngx_err_t err;
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216 ngx_uint_t i, found;
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217 ngx_event_t *ev, **queue;
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218 struct timeval tv, *tp;
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219 ngx_connection_t *c;
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0
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220
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221 if (max_fd == -1) {
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222 for (i = 0; i < nevents; i++) {
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223 c = event_index[i]->data;
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224 if (max_fd < c->fd) {
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225 max_fd = c->fd;
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226 }
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227 }
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228
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229 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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230 "change max_fd: %d", max_fd);
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231 }
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232
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233 #if (NGX_DEBUG)
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234 if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
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235 for (i = 0; i < nevents; i++) {
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236 ev = event_index[i];
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237 c = ev->data;
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238 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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239 "select event: fd:%d wr:%d", c->fd, ev->write);
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240 }
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241
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242 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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243 "max_fd: %d", max_fd);
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244 }
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245 #endif
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246
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247 if (timer == NGX_TIMER_INFINITE) {
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248 tp = NULL;
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249
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250 } else {
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106
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251 tv.tv_sec = (long) (timer / 1000);
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252 tv.tv_usec = (long) ((timer % 1000) * 1000);
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0
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253 tp = &tv;
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254 }
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255
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256 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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106
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257 "select timer: %M", timer);
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0
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258
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259 work_read_fd_set = master_read_fd_set;
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260 work_write_fd_set = master_write_fd_set;
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261
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262 ready = select(max_fd + 1, &work_read_fd_set, &work_write_fd_set, NULL, tp);
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112
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263
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518
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264 err = (ready == -1) ? ngx_errno : 0;
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0
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265
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566
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266 if (flags & NGX_UPDATE_TIME || ngx_event_timer_alarm) {
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267 ngx_time_update();
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112
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268 }
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0
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269
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270 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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271 "select ready %d", ready);
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272
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112
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273 if (err) {
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356
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274 ngx_uint_t level;
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275
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112
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276 if (err == NGX_EINTR) {
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277
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278 if (ngx_event_timer_alarm) {
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279 ngx_event_timer_alarm = 0;
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280 return NGX_OK;
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281 }
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126
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282
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112
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283 level = NGX_LOG_INFO;
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126
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284
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285 } else {
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112
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286 level = NGX_LOG_ALERT;
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287 }
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288
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289 ngx_log_error(level, cycle->log, err, "select() failed");
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484
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290
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291 if (err == EBADF) {
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292 ngx_select_repair_fd_sets(cycle);
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293 }
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294
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0
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295 return NGX_ERROR;
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296 }
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297
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116
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298 if (ready == 0) {
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299 if (timer != NGX_TIMER_INFINITE) {
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300 return NGX_OK;
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301 }
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302
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303 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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304 "select() returned no events without timeout");
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305 return NGX_ERROR;
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112
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306 }
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307
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308 ngx_mutex_lock(ngx_posted_events_mutex);
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309
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0
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310 nready = 0;
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311
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312 for (i = 0; i < nevents; i++) {
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313 ev = event_index[i];
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314 c = ev->data;
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315 found = 0;
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316
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317 if (ev->write) {
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318 if (FD_ISSET(c->fd, &work_write_fd_set)) {
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319 found = 1;
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320 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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321 "select write %d", c->fd);
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322 }
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323
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324 } else {
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325 if (FD_ISSET(c->fd, &work_read_fd_set)) {
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326 found = 1;
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327 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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328 "select read %d", c->fd);
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329 }
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330 }
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331
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332 if (found) {
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333 ev->ready = 1;
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334
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112
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335 queue = (ngx_event_t **) (ev->accept ? &ngx_posted_accept_events:
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336 &ngx_posted_events);
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126
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337 ngx_locked_post_event(ev, queue);
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0
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338
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339 nready++;
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340 }
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341 }
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342
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112
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343 ngx_mutex_unlock(ngx_posted_events_mutex);
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0
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344
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345 if (ready != nready) {
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484
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346 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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347 "select ready != events: %d:%d", ready, nready);
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348
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349 ngx_select_repair_fd_sets(cycle);
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0
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350 }
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351
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352 return NGX_OK;
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353 }
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354
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355
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484
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356 static void
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357 ngx_select_repair_fd_sets(ngx_cycle_t *cycle)
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358 {
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359 int n;
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360 socklen_t len;
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361 ngx_err_t err;
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362 ngx_socket_t s;
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363
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364 for (s = 0; s <= max_fd; s++) {
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365
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366 if (FD_ISSET(s, &master_read_fd_set) == 0) {
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367 continue;
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368 }
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369
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370 len = sizeof(int);
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371
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372 if (getsockopt(s, SOL_SOCKET, SO_TYPE, &n, &len) == -1) {
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373 err = ngx_socket_errno;
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374
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375 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
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376 "invalid descriptor #%d in read fd_set", s);
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377
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378 FD_CLR(s, &master_read_fd_set);
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379 }
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380 }
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381
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382 for (s = 0; s <= max_fd; s++) {
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383
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384 if (FD_ISSET(s, &master_write_fd_set) == 0) {
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385 continue;
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386 }
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387
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388 len = sizeof(int);
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389
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390 if (getsockopt(s, SOL_SOCKET, SO_TYPE, &n, &len) == -1) {
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391 err = ngx_socket_errno;
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392
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393 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
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394 "invalid descriptor #%d in write fd_set", s);
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395
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396 FD_CLR(s, &master_write_fd_set);
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397 }
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398 }
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399
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400 max_fd = -1;
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401 }
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402
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403
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50
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404 static char *
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405 ngx_select_init_conf(ngx_cycle_t *cycle, void *conf)
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0
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406 {
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407 ngx_event_conf_t *ecf;
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408
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409 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
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410
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411 if (ecf->use != ngx_select_module.ctx_index) {
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412 return NGX_CONF_OK;
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413 }
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414
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415 /* disable warning: the default FD_SETSIZE is 1024U in FreeBSD 5.x */
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416
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384
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417 if (cycle->connection_n > FD_SETSIZE) {
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0
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418 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
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419 "the maximum number of files "
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384
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420 "supported by select() is %ud", FD_SETSIZE);
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0
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421 return NGX_CONF_ERROR;
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422 }
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112
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423
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488
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424 #if (NGX_THREADS)
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112
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425
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0
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426 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
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427 "select() is not supported in the threaded mode");
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428 return NGX_CONF_ERROR;
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112
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429
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0
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430 #else
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112
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431
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0
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432 return NGX_CONF_OK;
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112
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433
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0
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434 #endif
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435 }
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