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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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660
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4 * Copyright (C) Nginx, Inc.
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488
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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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13 static ngx_int_t ngx_select_init(ngx_cycle_t *cycle, ngx_msec_t timer);
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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, 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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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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21 static void ngx_select_repair_fd_sets(ngx_cycle_t *cycle);
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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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30 static ngx_uint_t max_read;
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31 static ngx_uint_t max_write;
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32 static ngx_uint_t nevents;
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33
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34 static ngx_event_t **event_index;
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35
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36
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37 static ngx_str_t select_name = ngx_string("select");
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38
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39 ngx_event_module_t ngx_select_module_ctx = {
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40 &select_name,
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41 NULL, /* create configuration */
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42 ngx_select_init_conf, /* init configuration */
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43
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44 {
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45 ngx_select_add_event, /* add an event */
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46 ngx_select_del_event, /* delete an event */
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47 ngx_select_add_event, /* enable an event */
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48 ngx_select_del_event, /* disable an event */
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49 NULL, /* add an connection */
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50 NULL, /* delete an connection */
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51 NULL, /* process the changes */
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52 ngx_select_process_events, /* process the events */
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53 ngx_select_init, /* init the events */
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54 ngx_select_done /* done the events */
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55 }
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56
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57 };
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58
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59 ngx_module_t ngx_select_module = {
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60 NGX_MODULE_V1,
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61 &ngx_select_module_ctx, /* module context */
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62 NULL, /* module directives */
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63 NGX_EVENT_MODULE, /* module type */
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64 NULL, /* init master */
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65 NULL, /* init module */
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66 NULL, /* init process */
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67 NULL, /* init thread */
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68 NULL, /* exit thread */
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69 NULL, /* exit process */
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70 NULL, /* exit master */
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71 NGX_MODULE_V1_PADDING
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72 };
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73
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74
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75 static ngx_int_t
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76 ngx_select_init(ngx_cycle_t *cycle, ngx_msec_t timer)
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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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552
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86 if (ngx_process >= NGX_PROCESS_WORKER
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488
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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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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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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
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101 event_index = index;
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102 }
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103
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104 ngx_io = ngx_os_io;
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105
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106 ngx_event_actions = ngx_select_module_ctx.actions;
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107
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108 ngx_event_flags = NGX_USE_LEVEL_EVENT;
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109
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110 max_read = 0;
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111 max_write = 0;
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112
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113 return NGX_OK;
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114 }
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115
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116
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117 static void
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118 ngx_select_done(ngx_cycle_t *cycle)
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119 {
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120 ngx_free(event_index);
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121
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122 event_index = NULL;
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123 }
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124
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125
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126 static ngx_int_t
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127 ngx_select_add_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
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128 {
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129 ngx_connection_t *c;
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130
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131 c = ev->data;
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132
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133 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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134 "select add event fd:%d ev:%i", c->fd, event);
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135
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136 if (ev->index != NGX_INVALID_INDEX) {
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137 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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138 "select event fd:%d ev:%i is already set", c->fd, event);
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139 return NGX_OK;
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140 }
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141
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142 if ((event == NGX_READ_EVENT && ev->write)
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143 || (event == NGX_WRITE_EVENT && !ev->write))
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144 {
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145 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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146 "invalid select %s event fd:%d ev:%i",
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147 ev->write ? "write" : "read", c->fd, event);
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148 return NGX_ERROR;
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149 }
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150
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151 if ((event == NGX_READ_EVENT) && (max_read >= FD_SETSIZE)
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152 || (event == NGX_WRITE_EVENT) && (max_write >= FD_SETSIZE))
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153 {
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154 ngx_log_error(NGX_LOG_ERR, ev->log, 0,
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155 "maximum number of descriptors "
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156 "supported by select() is %d", FD_SETSIZE);
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157 return NGX_ERROR;
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158 }
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159
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160 if (event == NGX_READ_EVENT) {
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161 FD_SET(c->fd, &master_read_fd_set);
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162 max_read++;
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163
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164 } else if (event == NGX_WRITE_EVENT) {
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165 FD_SET(c->fd, &master_write_fd_set);
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166 max_write++;
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167 }
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168
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169 ev->active = 1;
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170
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171 event_index[nevents] = ev;
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172 ev->index = nevents;
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173 nevents++;
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174
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175 return NGX_OK;
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176 }
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177
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178
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179 static ngx_int_t
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180 ngx_select_del_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
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181 {
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182 ngx_event_t *e;
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183 ngx_connection_t *c;
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184
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185 c = ev->data;
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186
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187 ev->active = 0;
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188
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189 if (ev->index == NGX_INVALID_INDEX) {
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190 return NGX_OK;
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191 }
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192
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193 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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194 "select del event fd:%d ev:%i", c->fd, event);
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195
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196 if (event == NGX_READ_EVENT) {
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197 FD_CLR(c->fd, &master_read_fd_set);
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198 max_read--;
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199
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200 } else if (event == NGX_WRITE_EVENT) {
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201 FD_CLR(c->fd, &master_write_fd_set);
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202 max_write--;
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203 }
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204
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205 if (ev->index < --nevents) {
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206 e = event_index[nevents];
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207 event_index[ev->index] = e;
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208 e->index = ev->index;
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209 }
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210
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211 ev->index = NGX_INVALID_INDEX;
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212
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213 return NGX_OK;
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214 }
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215
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216
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217 static ngx_int_t
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218 ngx_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
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219 ngx_uint_t flags)
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220 {
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221 int ready, nready;
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222 ngx_err_t err;
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223 ngx_uint_t i, found;
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224 ngx_event_t *ev, **queue;
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225 struct timeval tv, *tp;
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226 ngx_connection_t *c;
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227
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228 #if (NGX_DEBUG)
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229 if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
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230 for (i = 0; i < nevents; i++) {
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231 ev = event_index[i];
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232 c = ev->data;
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233 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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234 "select event: fd:%d wr:%d", c->fd, ev->write);
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235 }
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236 }
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237 #endif
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238
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239 if (timer == NGX_TIMER_INFINITE) {
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240 tp = NULL;
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241
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242 } else {
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243 tv.tv_sec = (long) (timer / 1000);
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244 tv.tv_usec = (long) ((timer % 1000) * 1000);
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245 tp = &tv;
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246 }
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247
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248 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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249 "select timer: %M", timer);
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250
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251 work_read_fd_set = master_read_fd_set;
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252 work_write_fd_set = master_write_fd_set;
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253
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254 if (max_read || max_write) {
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255 ready = select(0, &work_read_fd_set, &work_write_fd_set, NULL, tp);
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256
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257 } else {
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258
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259 /*
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260 * Winsock select() requires that at least one descriptor set must be
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261 * be non-null, and any non-null descriptor set must contain at least
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262 * one handle to a socket. Otherwise select() returns WSAEINVAL.
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263 */
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264
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265 ngx_msleep(timer);
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266
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267 ready = 0;
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268 }
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269
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518
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270 err = (ready == -1) ? ngx_socket_errno : 0;
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488
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271
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272 if (flags & NGX_UPDATE_TIME) {
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566
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273 ngx_time_update();
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488
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274 }
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275
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276 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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277 "select ready %d", ready);
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278
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279 if (err) {
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280 ngx_log_error(NGX_LOG_ALERT, cycle->log, err, "select() failed");
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281
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282 if (err == WSAENOTSOCK) {
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283 ngx_select_repair_fd_sets(cycle);
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284 }
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285
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286 return NGX_ERROR;
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287 }
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288
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289 if (ready == 0) {
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290 if (timer != NGX_TIMER_INFINITE) {
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291 return NGX_OK;
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292 }
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293
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294 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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295 "select() returned no events without timeout");
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296 return NGX_ERROR;
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297 }
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298
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299 ngx_mutex_lock(ngx_posted_events_mutex);
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300
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301 nready = 0;
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302
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303 for (i = 0; i < nevents; i++) {
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304 ev = event_index[i];
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305 c = ev->data;
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306 found = 0;
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307
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308 if (ev->write) {
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309 if (FD_ISSET(c->fd, &work_write_fd_set)) {
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310 found = 1;
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311 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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312 "select write %d", c->fd);
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313 }
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314
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315 } else {
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316 if (FD_ISSET(c->fd, &work_read_fd_set)) {
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317 found = 1;
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318 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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319 "select read %d", c->fd);
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320 }
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321 }
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322
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323 if (found) {
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324 ev->ready = 1;
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325
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326 queue = (ngx_event_t **) (ev->accept ? &ngx_posted_accept_events:
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327 &ngx_posted_events);
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328 ngx_locked_post_event(ev, queue);
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329
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330 nready++;
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331 }
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332 }
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333
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334 ngx_mutex_unlock(ngx_posted_events_mutex);
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335
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336 if (ready != nready) {
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337 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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338 "select ready != events: %d:%d", ready, nready);
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339
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340 ngx_select_repair_fd_sets(cycle);
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341 }
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342
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343 return NGX_OK;
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344 }
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345
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346
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347 static void
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348 ngx_select_repair_fd_sets(ngx_cycle_t *cycle)
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349 {
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350 int n;
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351 u_int i;
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352 socklen_t len;
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353 ngx_err_t err;
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354 ngx_socket_t s;
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355
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356 for (i = 0; i < master_read_fd_set.fd_count; i++) {
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357
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358 s = master_read_fd_set.fd_array[i];
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359 len = sizeof(int);
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360
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361 if (getsockopt(s, SOL_SOCKET, SO_TYPE, (char *) &n, &len) == -1) {
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362 err = ngx_socket_errno;
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363
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364 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
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365 "invalid descriptor #%d in read fd_set", s);
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366
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367 FD_CLR(s, &master_read_fd_set);
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368 }
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369 }
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370
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371 for (i = 0; i < master_write_fd_set.fd_count; i++) {
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372
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373 s = master_write_fd_set.fd_array[i];
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374 len = sizeof(int);
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375
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376 if (getsockopt(s, SOL_SOCKET, SO_TYPE, (char *) &n, &len) == -1) {
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377 err = ngx_socket_errno;
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378
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379 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
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380 "invalid descriptor #%d in write fd_set", s);
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381
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382 FD_CLR(s, &master_write_fd_set);
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383 }
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384 }
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385 }
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386
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387
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388 static char *
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389 ngx_select_init_conf(ngx_cycle_t *cycle, void *conf)
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390 {
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391 ngx_event_conf_t *ecf;
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392
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393 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
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394
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395 if (ecf->use != ngx_select_module.ctx_index) {
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396 return NGX_CONF_OK;
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397 }
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398
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399 return NGX_CONF_OK;
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400 }
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