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