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488
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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 static ngx_int_t ngx_select_init(ngx_cycle_t *cycle, ngx_msec_t timer);
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13 static void ngx_select_done(ngx_cycle_t *cycle);
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14 static ngx_int_t ngx_select_add_event(ngx_event_t *ev, ngx_int_t event,
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15 ngx_uint_t flags);
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16 static ngx_int_t ngx_select_del_event(ngx_event_t *ev, ngx_int_t event,
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17 ngx_uint_t flags);
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18 static ngx_int_t ngx_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
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19 ngx_uint_t flags);
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20 static void ngx_select_repair_fd_sets(ngx_cycle_t *cycle);
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21 static char *ngx_select_init_conf(ngx_cycle_t *cycle, void *conf);
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22
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23
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24 static fd_set master_read_fd_set;
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25 static fd_set master_write_fd_set;
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26 static fd_set work_read_fd_set;
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27 static fd_set work_write_fd_set;
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28
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29 static ngx_uint_t max_read;
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30 static ngx_uint_t max_write;
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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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59 NGX_MODULE_V1,
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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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63 NULL, /* init master */
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64 NULL, /* init module */
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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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71 };
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72
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73
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74 static ngx_int_t
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75 ngx_select_init(ngx_cycle_t *cycle, ngx_msec_t timer)
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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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85 if (ngx_process == NGX_PROCESS_WORKER
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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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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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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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99
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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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107 ngx_event_flags = NGX_USE_LEVEL_EVENT;
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108
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109 max_read = 0;
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110 max_write = 0;
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111
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112 return NGX_OK;
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113 }
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114
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115
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116 static void
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117 ngx_select_done(ngx_cycle_t *cycle)
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118 {
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119 ngx_free(event_index);
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120
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121 event_index = NULL;
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122 }
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123
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124
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125 static ngx_int_t
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126 ngx_select_add_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
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127 {
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128 ngx_connection_t *c;
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129
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130 c = ev->data;
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131
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132 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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133 "select add event fd:%d ev:%i", c->fd, event);
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134
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135 if (ev->index != NGX_INVALID_INDEX) {
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136 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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137 "select event fd:%d ev:%i is already set", c->fd, event);
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138 return NGX_OK;
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139 }
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140
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141 if ((event == NGX_READ_EVENT && ev->write)
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142 || (event == NGX_WRITE_EVENT && !ev->write))
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143 {
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144 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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145 "invalid select %s event fd:%d ev:%i",
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146 ev->write ? "write" : "read", c->fd, event);
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147 return NGX_ERROR;
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148 }
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149
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150 if ((event == NGX_READ_EVENT) && (max_read >= FD_SETSIZE)
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151 || (event == NGX_WRITE_EVENT) && (max_write >= FD_SETSIZE))
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152 {
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153 ngx_log_error(NGX_LOG_ERR, ev->log, 0,
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154 "maximum number of descriptors "
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155 "supported by select() is %d", FD_SETSIZE);
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156 return NGX_ERROR;
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157 }
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158
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159 if (event == NGX_READ_EVENT) {
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160 FD_SET(c->fd, &master_read_fd_set);
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161 max_read++;
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162
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163 } else if (event == NGX_WRITE_EVENT) {
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164 FD_SET(c->fd, &master_write_fd_set);
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165 max_write++;
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166 }
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167
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168 ev->active = 1;
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169
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170 event_index[nevents] = ev;
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171 ev->index = nevents;
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172 nevents++;
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173
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174 return NGX_OK;
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175 }
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176
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177
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178 static ngx_int_t
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179 ngx_select_del_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
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180 {
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181 ngx_event_t *e;
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182 ngx_connection_t *c;
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183
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184 c = ev->data;
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185
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186 ev->active = 0;
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187
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188 if (ev->index == NGX_INVALID_INDEX) {
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189 return NGX_OK;
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190 }
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191
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192 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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193 "select del event fd:%d ev:%i", c->fd, event);
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194
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195 if (event == NGX_READ_EVENT) {
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196 FD_CLR(c->fd, &master_read_fd_set);
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197 max_read--;
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198
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199 } else if (event == NGX_WRITE_EVENT) {
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200 FD_CLR(c->fd, &master_write_fd_set);
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201 max_write--;
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202 }
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203
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204 if (ev->index < --nevents) {
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205 e = event_index[nevents];
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206 event_index[ev->index] = e;
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207 e->index = ev->index;
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208 }
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209
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210 ev->index = NGX_INVALID_INDEX;
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211
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212 return NGX_OK;
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213 }
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214
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215
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216 static ngx_int_t
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217 ngx_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
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218 ngx_uint_t flags)
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219 {
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220 int ready, nready;
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221 ngx_err_t err;
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222 ngx_uint_t i, found;
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223 ngx_event_t *ev, **queue;
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224 struct timeval tv, *tp;
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225 ngx_connection_t *c;
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226
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227 #if (NGX_DEBUG)
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228 if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
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229 for (i = 0; i < nevents; i++) {
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230 ev = event_index[i];
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231 c = ev->data;
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232 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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233 "select event: fd:%d wr:%d", c->fd, ev->write);
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234 }
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235 }
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236 #endif
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237
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238 if (timer == NGX_TIMER_INFINITE) {
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239 tp = NULL;
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240
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241 } else {
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242 tv.tv_sec = (long) (timer / 1000);
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243 tv.tv_usec = (long) ((timer % 1000) * 1000);
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244 tp = &tv;
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245 }
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246
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247 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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248 "select timer: %M", timer);
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249
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250 work_read_fd_set = master_read_fd_set;
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251 work_write_fd_set = master_write_fd_set;
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252
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253 if (max_read || max_write) {
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254 ready = select(0, &work_read_fd_set, &work_write_fd_set, NULL, tp);
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255
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256 } else {
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257
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258 /*
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259 * Winsock select() requires that at least one descriptor set must be
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260 * be non-null, and any non-null descriptor set must contain at least
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261 * one handle to a socket. Otherwise select() returns WSAEINVAL.
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262 */
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263
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264 ngx_msleep(timer);
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265
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266 ready = 0;
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267 }
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268
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269 if (ready == -1) {
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270 err = ngx_socket_errno;
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271 } else {
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272 err = 0;
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273 }
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274
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275 if (flags & NGX_UPDATE_TIME) {
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276 ngx_time_update(0, 0);
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277 }
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278
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279 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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280 "select ready %d", ready);
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281
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282 if (err) {
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283 ngx_log_error(NGX_LOG_ALERT, cycle->log, err, "select() failed");
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284
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285 if (err == WSAENOTSOCK) {
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286 ngx_select_repair_fd_sets(cycle);
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287 }
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288
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289 return NGX_ERROR;
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290 }
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291
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292 if (ready == 0) {
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293 if (timer != NGX_TIMER_INFINITE) {
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294 return NGX_OK;
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295 }
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296
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297 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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298 "select() returned no events without timeout");
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299 return NGX_ERROR;
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300 }
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301
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302 ngx_mutex_lock(ngx_posted_events_mutex);
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303
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304 nready = 0;
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305
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306 for (i = 0; i < nevents; i++) {
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307 ev = event_index[i];
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308 c = ev->data;
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309 found = 0;
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310
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311 if (ev->write) {
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312 if (FD_ISSET(c->fd, &work_write_fd_set)) {
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313 found = 1;
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314 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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315 "select write %d", c->fd);
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316 }
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317
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318 } else {
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319 if (FD_ISSET(c->fd, &work_read_fd_set)) {
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320 found = 1;
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321 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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322 "select read %d", c->fd);
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323 }
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324 }
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325
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326 if (found) {
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327 ev->ready = 1;
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328
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329 queue = (ngx_event_t **) (ev->accept ? &ngx_posted_accept_events:
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330 &ngx_posted_events);
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331 ngx_locked_post_event(ev, queue);
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332
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333 nready++;
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334 }
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335 }
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336
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337 ngx_mutex_unlock(ngx_posted_events_mutex);
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338
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339 if (ready != nready) {
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340 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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341 "select ready != events: %d:%d", ready, nready);
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342
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343 ngx_select_repair_fd_sets(cycle);
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344 }
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345
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346 return NGX_OK;
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347 }
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348
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349
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350 static void
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351 ngx_select_repair_fd_sets(ngx_cycle_t *cycle)
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352 {
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353 int n;
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354 u_int i;
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355 socklen_t len;
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356 ngx_err_t err;
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357 ngx_socket_t s;
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358
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359 for (i = 0; i < master_read_fd_set.fd_count; i++) {
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360
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361 s = master_read_fd_set.fd_array[i];
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362 len = sizeof(int);
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363
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364 if (getsockopt(s, SOL_SOCKET, SO_TYPE, (char *) &n, &len) == -1) {
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365 err = ngx_socket_errno;
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366
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367 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
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368 "invalid descriptor #%d in read fd_set", s);
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369
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370 FD_CLR(s, &master_read_fd_set);
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371 }
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372 }
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373
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374 for (i = 0; i < master_write_fd_set.fd_count; i++) {
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375
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376 s = master_write_fd_set.fd_array[i];
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377 len = sizeof(int);
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378
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379 if (getsockopt(s, SOL_SOCKET, SO_TYPE, (char *) &n, &len) == -1) {
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380 err = ngx_socket_errno;
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381
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382 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
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383 "invalid descriptor #%d in write fd_set", s);
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384
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385 FD_CLR(s, &master_write_fd_set);
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386 }
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387 }
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388 }
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389
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390
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391 static char *
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392 ngx_select_init_conf(ngx_cycle_t *cycle, void *conf)
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393 {
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394 ngx_event_conf_t *ecf;
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395
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396 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
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397
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398 if (ecf->use != ngx_select_module.ctx_index) {
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399 return NGX_CONF_OK;
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400 }
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401
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402 return NGX_CONF_OK;
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403 }
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