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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12
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13 static ngx_int_t ngx_select_init(ngx_cycle_t *cycle);
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14 static void ngx_select_done(ngx_cycle_t *cycle);
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15 static ngx_int_t ngx_select_add_event(ngx_event_t *ev, int event, u_int flags);
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16 static ngx_int_t ngx_select_del_event(ngx_event_t *ev, int event, u_int flags);
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17 static ngx_int_t ngx_select_process_events(ngx_cycle_t *cycle);
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18 static char *ngx_select_init_conf(ngx_cycle_t *cycle, void *conf);
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19
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20
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21 static fd_set master_read_fd_set;
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22 static fd_set master_write_fd_set;
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23 static fd_set work_read_fd_set;
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24 static fd_set work_write_fd_set;
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25
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10
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26 #if (NGX_WIN32)
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0
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27 static int max_read;
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28 static int max_write;
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29 #else
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30 static int max_fd;
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31 #endif
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32
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33 static ngx_uint_t nevents;
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34
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35 static ngx_event_t **event_index;
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36 #if 0
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37 static ngx_event_t **ready_index;
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38 #endif
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39
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40 static ngx_event_t *accept_events;
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41
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42
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43 static ngx_str_t select_name = ngx_string("select");
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44
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45 ngx_event_module_t ngx_select_module_ctx = {
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46 &select_name,
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47 NULL, /* create configuration */
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48 ngx_select_init_conf, /* init configuration */
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49
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50 {
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51 ngx_select_add_event, /* add an event */
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52 ngx_select_del_event, /* delete an event */
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53 ngx_select_add_event, /* enable an event */
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54 ngx_select_del_event, /* disable an event */
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55 NULL, /* add an connection */
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56 NULL, /* delete an connection */
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57 NULL, /* process the changes */
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58 ngx_select_process_events, /* process the events */
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59 ngx_select_init, /* init the events */
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60 ngx_select_done /* done the events */
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61 }
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62
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63 };
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64
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65 ngx_module_t ngx_select_module = {
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58
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66 NGX_MODULE_V1,
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0
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67 &ngx_select_module_ctx, /* module context */
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68 NULL, /* module directives */
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69 NGX_EVENT_MODULE, /* module type */
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70 NULL, /* init module */
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71 NULL /* init process */
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72 };
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73
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74
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50
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75 static ngx_int_t
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76 ngx_select_init(ngx_cycle_t *cycle)
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0
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77 {
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78 ngx_event_t **index;
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79
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80 if (event_index == NULL) {
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81 FD_ZERO(&master_read_fd_set);
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82 FD_ZERO(&master_write_fd_set);
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83 nevents = 0;
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84 }
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85
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86 if (ngx_process == NGX_PROCESS_WORKER
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87 || cycle->old_cycle == NULL
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88 || cycle->old_cycle->connection_n < cycle->connection_n)
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89 {
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50
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90 index = ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n,
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91 cycle->log);
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92 if (index == NULL) {
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93 return NGX_ERROR;
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94 }
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0
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95
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96 if (event_index) {
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97 ngx_memcpy(index, event_index, sizeof(ngx_event_t *) * nevents);
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98 ngx_free(event_index);
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99 }
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100 event_index = index;
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101
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102 #if 0
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103 if (ready_index) {
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104 ngx_free(ready_index);
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105 }
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50
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106
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107 ready_index = ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n,
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108 cycle->log);
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109 if (ready_index == NULL) {
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110 return NGX_ERROR;
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111 }
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0
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112 #endif
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113 }
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114
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115 ngx_io = ngx_os_io;
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116
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117 ngx_event_actions = ngx_select_module_ctx.actions;
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118
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119 ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_ONESHOT_EVENT;
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120
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10
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121 #if (NGX_WIN32)
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0
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122 max_read = max_write = 0;
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123 #else
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124 max_fd = -1;
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125 #endif
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126
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127 return NGX_OK;
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128 }
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129
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130
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50
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131 static void
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132 ngx_select_done(ngx_cycle_t *cycle)
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0
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133 {
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134 ngx_free(event_index);
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135 #if 0
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136 ngx_free(ready_index);
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137 #endif
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138
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139 event_index = NULL;
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140 }
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141
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142
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50
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143 static ngx_int_t
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144 ngx_select_add_event(ngx_event_t *ev, int event, u_int flags)
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0
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145 {
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146 ngx_connection_t *c;
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147
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148 c = ev->data;
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149
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150 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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151 "select add event fd:%d ev:%d", c->fd, event);
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152
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153 if (ev->index != NGX_INVALID_INDEX) {
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154 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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155 "select event fd:%d ev:%d is already set", c->fd, event);
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156 return NGX_OK;
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157 }
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158
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159 #if (NGX_WIN32)
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0
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160
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161 if ((event == NGX_READ_EVENT) && (max_read >= FD_SETSIZE)
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162 || (event == NGX_WRITE_EVENT) && (max_write >= FD_SETSIZE))
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163 {
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164 ngx_log_error(NGX_LOG_ERR, ev->log, 0,
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165 "maximum number of descriptors "
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166 "supported by select() is %d", FD_SETSIZE);
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167 return NGX_ERROR;
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168 }
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169
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170 if (event == NGX_READ_EVENT) {
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171 FD_SET(c->fd, &master_read_fd_set);
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172 max_read++;
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173
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174 } else if (event == NGX_WRITE_EVENT) {
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175 FD_SET(c->fd, &master_write_fd_set);
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176 max_write++;
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177 }
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178
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179 #else
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180
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181 if (event == NGX_READ_EVENT) {
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182 FD_SET(c->fd, &master_read_fd_set);
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183
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184 } else if (event == NGX_WRITE_EVENT) {
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185 FD_SET(c->fd, &master_write_fd_set);
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186 }
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187
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188 if (max_fd != -1 && max_fd < c->fd) {
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189 max_fd = c->fd;
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190 }
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191
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192 #endif
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193
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194 ev->active = 1;
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195 ev->oneshot = (u_char) ((flags & NGX_ONESHOT_EVENT) ? 1 : 0);
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196
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197 event_index[nevents] = ev;
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198 ev->index = nevents;
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199 nevents++;
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200
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201 return NGX_OK;
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202 }
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203
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204
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50
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205 static ngx_int_t
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206 ngx_select_del_event(ngx_event_t *ev, int event, u_int flags)
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0
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207 {
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208 ngx_connection_t *c;
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209
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210 c = ev->data;
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211
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212 ev->active = 0;
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213
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214 if (ev->index == NGX_INVALID_INDEX) {
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215 return NGX_OK;
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216 }
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217
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218 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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219 "select del event fd:%d ev:%d", c->fd, event);
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220
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10
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221 #if (NGX_WIN32)
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0
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222
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223 if (event == NGX_READ_EVENT) {
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224 FD_CLR(c->fd, &master_read_fd_set);
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225 max_read--;
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226
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227 } else if (event == NGX_WRITE_EVENT) {
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228 FD_CLR(c->fd, &master_write_fd_set);
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229 max_write--;
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230 }
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231
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232 #else
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233
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234 if (event == NGX_READ_EVENT) {
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235 FD_CLR(c->fd, &master_read_fd_set);
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236
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237 } else if (event == NGX_WRITE_EVENT) {
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238 FD_CLR(c->fd, &master_write_fd_set);
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239 }
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240
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241 if (max_fd == c->fd) {
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242 max_fd = -1;
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243 }
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244
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245 #endif
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246
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247 if (ev->index < (u_int) --nevents) {
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248 event_index[ev->index] = event_index[nevents];
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249 event_index[ev->index]->index = ev->index;
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250 }
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251
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252 ev->index = NGX_INVALID_INDEX;
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253
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254 return NGX_OK;
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255 }
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256
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257
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50
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258 static ngx_int_t
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259 ngx_select_process_events(ngx_cycle_t *cycle)
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0
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260 {
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261 int ready, nready;
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262 ngx_uint_t i, found, lock, expire;
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263 ngx_err_t err;
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264 ngx_msec_t timer;
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265 ngx_event_t *ev;
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266 ngx_connection_t *c;
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267 ngx_epoch_msec_t delta;
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268 struct timeval tv, *tp;
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18
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269 #if (NGX_HAVE_SELECT_CHANGE_TIMEOUT)
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0
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270 static ngx_epoch_msec_t deltas = 0;
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271 #endif
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272
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273 for ( ;; ) {
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274 timer = ngx_event_find_timer();
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275
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276 if (timer != 0) {
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277 break;
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278 }
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279
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280 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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281 "select expired timer");
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282
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283 ngx_event_expire_timers((ngx_msec_t)
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284 (ngx_elapsed_msec - ngx_old_elapsed_msec));
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285 }
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286
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287 ngx_old_elapsed_msec = ngx_elapsed_msec;
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288
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289 expire = 1;
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290
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10
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291 #if !(NGX_WIN32)
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0
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292
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293 if (ngx_accept_mutex) {
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294 if (ngx_accept_disabled > 0) {
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295 ngx_accept_disabled--;
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296
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297 } else {
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298 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
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299 return NGX_ERROR;
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300 }
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301
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302 if (ngx_accept_mutex_held == 0
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303 && (timer == NGX_TIMER_INFINITE
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304 || timer > ngx_accept_mutex_delay))
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305 {
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306 timer = ngx_accept_mutex_delay;
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307 expire = 0;
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308 }
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309 }
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310 }
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311
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312 if (max_fd == -1) {
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313 for (i = 0; i < nevents; i++) {
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314 c = event_index[i]->data;
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315 if (max_fd < c->fd) {
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316 max_fd = c->fd;
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317 }
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318 }
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319
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320 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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321 "change max_fd: %d", max_fd);
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322 }
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323
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324 #endif
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325
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326 #if (NGX_DEBUG)
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327 if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
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328 for (i = 0; i < nevents; i++) {
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329 ev = event_index[i];
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330 c = ev->data;
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331 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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332 "select event: fd:%d wr:%d", c->fd, ev->write);
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333 }
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334
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10
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335 #if !(NGX_WIN32)
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0
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336 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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337 "max_fd: %d", max_fd);
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338 #endif
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339 }
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340 #endif
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341
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342 if (timer == NGX_TIMER_INFINITE) {
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343 tp = NULL;
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344 expire = 0;
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345
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346 } else {
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347 tv.tv_sec = timer / 1000;
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348 tv.tv_usec = (timer % 1000) * 1000;
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349 tp = &tv;
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350 }
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351
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352 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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353 "select timer: %d", timer);
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354
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355 work_read_fd_set = master_read_fd_set;
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356 work_write_fd_set = master_write_fd_set;
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357
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36
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358 #if 1
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0
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359 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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36
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360 /*
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361 * (void *) disables "dereferencing type-punned
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362 * pointer will break strict-aliasing rules
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363 */
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364 "select read fd_set: %08Xd",
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365 *(int *) (void *) &work_read_fd_set);
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366 #endif
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0
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367
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10
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368 #if (NGX_WIN32)
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0
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369 ready = select(0, &work_read_fd_set, &work_write_fd_set, NULL, tp);
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370 #else
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371 ready = select(max_fd + 1, &work_read_fd_set, &work_write_fd_set, NULL, tp);
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372 #endif
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373
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374 if (ready == -1) {
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375 err = ngx_socket_errno;
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376 } else {
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377 err = 0;
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378 }
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379
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18
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380 #if (NGX_HAVE_SELECT_CHANGE_TIMEOUT)
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0
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381
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382 if (timer != NGX_TIMER_INFINITE) {
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383 delta = timer - (tv.tv_sec * 1000 + tv.tv_usec / 1000);
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384
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385 /*
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386 * learn the real time and update the cached time
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387 * if the sum of the last deltas overcomes 1 second
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388 */
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389
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390 deltas += delta;
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391 if (deltas > 1000) {
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392 ngx_gettimeofday(&tv);
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393 ngx_time_update(tv.tv_sec);
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394 deltas = tv.tv_usec / 1000;
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395
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396 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
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397 + tv.tv_usec / 1000 - ngx_start_msec;
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398 } else {
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399 ngx_elapsed_msec += delta;
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400 }
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401
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402 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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403 "select timer: %d, delta: %d", timer, (int) delta);
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404
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405 } else {
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406 delta = 0;
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407 ngx_gettimeofday(&tv);
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408 ngx_time_update(tv.tv_sec);
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409
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410 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
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411 + tv.tv_usec / 1000 - ngx_start_msec;
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412
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413 if (ready == 0) {
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414 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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415 "select() returned no events without timeout");
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416 ngx_accept_mutex_unlock();
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417 return NGX_ERROR;
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418 }
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419 }
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420
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18
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421 #else /* !(NGX_HAVE_SELECT_CHANGE_TIMEOUT) */
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0
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422
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423 ngx_gettimeofday(&tv);
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424 ngx_time_update(tv.tv_sec);
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425
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426 delta = ngx_elapsed_msec;
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427 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
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428 + tv.tv_usec / 1000 - ngx_start_msec;
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429
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430 if (timer != NGX_TIMER_INFINITE) {
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431 delta = ngx_elapsed_msec - delta;
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432
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433 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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434 "select timer: %d, delta: %d", timer, (int) delta);
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435
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436 } else {
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437 if (ready == 0) {
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438 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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439 "select() returned no events without timeout");
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440 ngx_accept_mutex_unlock();
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441 return NGX_ERROR;
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442 }
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443 }
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444
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18
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445 #endif /* NGX_HAVE_SELECT_CHANGE_TIMEOUT */
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0
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446
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447 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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448 "select ready %d", ready);
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449
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450 if (err) {
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10
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451 #if (NGX_WIN32)
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0
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452 ngx_log_error(NGX_LOG_ALERT, cycle->log, err, "select() failed");
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453 #else
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454 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
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455 cycle->log, err, "select() failed");
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456 #endif
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457 ngx_accept_mutex_unlock();
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458 return NGX_ERROR;
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459 }
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460
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461
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462 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
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463 ngx_accept_mutex_unlock();
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464 return NGX_ERROR;
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465 }
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466
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467 lock = 1;
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468 nready = 0;
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469
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470 for (i = 0; i < nevents; i++) {
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471 ev = event_index[i];
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472 c = ev->data;
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473 found = 0;
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474
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475 if (ev->write) {
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476 if (FD_ISSET(c->fd, &work_write_fd_set)) {
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477 found = 1;
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478 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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479 "select write %d", c->fd);
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480 }
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481
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482 } else {
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483 if (FD_ISSET(c->fd, &work_read_fd_set)) {
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484 found = 1;
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485 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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486 "select read %d", c->fd);
|
|
487 }
|
|
488 }
|
|
489
|
|
490 if (found) {
|
|
491 ev->ready = 1;
|
|
492
|
|
493 if (ev->oneshot) {
|
|
494 if (ev->timer_set) {
|
|
495 ngx_del_timer(ev);
|
|
496 }
|
|
497
|
|
498 if (ev->write) {
|
|
499 ngx_select_del_event(ev, NGX_WRITE_EVENT, 0);
|
|
500 } else {
|
|
501 ngx_select_del_event(ev, NGX_READ_EVENT, 0);
|
|
502 }
|
|
503 }
|
|
504
|
|
505 if (ev->accept) {
|
|
506 ev->next = accept_events;
|
|
507 accept_events = ev;
|
|
508 } else {
|
|
509 ngx_post_event(ev);
|
|
510 }
|
|
511
|
|
512 nready++;
|
|
513
|
|
514 #if 0
|
|
515 ready_index[nready++] = ev;
|
|
516 #endif
|
|
517 }
|
|
518 }
|
|
519
|
|
520 #if 0
|
|
521 for (i = 0; i < nready; i++) {
|
|
522 ev = ready_index[i];
|
|
523 ready--;
|
|
524
|
|
525 if (!ev->active) {
|
|
526 continue;
|
|
527 }
|
|
528
|
|
529 ev->ready = 1;
|
|
530
|
|
531 if (ev->oneshot) {
|
|
532 if (ev->timer_set) {
|
|
533 ngx_del_timer(ev);
|
|
534 }
|
|
535
|
|
536 if (ev->write) {
|
|
537 ngx_select_del_event(ev, NGX_WRITE_EVENT, 0);
|
|
538 } else {
|
|
539 ngx_select_del_event(ev, NGX_READ_EVENT, 0);
|
|
540 }
|
|
541 }
|
|
542
|
58
|
543 ev->handler(ev);
|
0
|
544 }
|
|
545 #endif
|
|
546
|
|
547 ev = accept_events;
|
|
548
|
|
549 for ( ;; ) {
|
|
550
|
|
551 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
10
|
552 "accept event %p", ev);
|
0
|
553
|
|
554 if (ev == NULL) {
|
|
555 break;
|
|
556 }
|
|
557
|
|
558 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
559
|
58
|
560 ev->handler(ev);
|
0
|
561
|
|
562 if (ngx_accept_disabled > 0) {
|
|
563 lock = 0;
|
|
564 break;
|
|
565 }
|
|
566
|
|
567 ev = ev->next;
|
|
568
|
|
569 if (ev == NULL) {
|
|
570 lock = 0;
|
|
571 break;
|
|
572 }
|
|
573
|
|
574 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
575 ngx_accept_mutex_unlock();
|
|
576 return NGX_ERROR;
|
|
577 }
|
|
578 }
|
|
579
|
|
580 ngx_accept_mutex_unlock();
|
|
581 accept_events = NULL;
|
|
582
|
|
583 if (lock) {
|
|
584 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
585 }
|
|
586
|
|
587 if (ready != nready) {
|
|
588 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "select ready != events");
|
|
589 }
|
|
590
|
|
591 if (expire && delta) {
|
|
592 ngx_event_expire_timers((ngx_msec_t) delta);
|
|
593 }
|
|
594
|
|
595 if (!ngx_threaded) {
|
|
596 ngx_event_process_posted(cycle);
|
|
597 }
|
|
598
|
|
599 return NGX_OK;
|
|
600 }
|
|
601
|
|
602
|
50
|
603 static char *
|
|
604 ngx_select_init_conf(ngx_cycle_t *cycle, void *conf)
|
0
|
605 {
|
|
606 ngx_event_conf_t *ecf;
|
|
607
|
|
608 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
|
|
609
|
|
610 if (ecf->use != ngx_select_module.ctx_index) {
|
|
611 return NGX_CONF_OK;
|
|
612 }
|
|
613
|
|
614 /* disable warning: the default FD_SETSIZE is 1024U in FreeBSD 5.x */
|
|
615
|
10
|
616 #if !(NGX_WIN32)
|
0
|
617 if ((unsigned) ecf->connections > FD_SETSIZE) {
|
|
618 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
619 "the maximum number of files "
|
|
620 "supported by select() is " ngx_value(FD_SETSIZE));
|
|
621 return NGX_CONF_ERROR;
|
|
622 }
|
|
623 #endif
|
|
624
|
10
|
625 #if (NGX_THREADS) && !(NGX_WIN32)
|
0
|
626 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
627 "select() is not supported in the threaded mode");
|
|
628 return NGX_CONF_ERROR;
|
|
629 #else
|
|
630 return NGX_CONF_OK;
|
|
631 #endif
|
|
632 }
|