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0
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10
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11
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12
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13 static ngx_int_t ngx_select_init(ngx_cycle_t *cycle);
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14 static void ngx_select_done(ngx_cycle_t *cycle);
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15 static ngx_int_t ngx_select_add_event(ngx_event_t *ev, int event, u_int flags);
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16 static ngx_int_t ngx_select_del_event(ngx_event_t *ev, int event, u_int flags);
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17 static ngx_int_t ngx_select_process_events(ngx_cycle_t *cycle);
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18 static char *ngx_select_init_conf(ngx_cycle_t *cycle, void *conf);
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19
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20
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21 static fd_set master_read_fd_set;
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22 static fd_set master_write_fd_set;
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23 static fd_set work_read_fd_set;
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24 static fd_set work_write_fd_set;
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25
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10
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26 #if (NGX_WIN32)
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0
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27 static int max_read;
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28 static int max_write;
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29 #else
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30 static int max_fd;
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31 #endif
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32
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33 static ngx_uint_t nevents;
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34
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35 static ngx_event_t **event_index;
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36 #if 0
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37 static ngx_event_t **ready_index;
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38 #endif
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39
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40 static ngx_event_t *accept_events;
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41
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42
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43 static ngx_str_t select_name = ngx_string("select");
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44
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45 ngx_event_module_t ngx_select_module_ctx = {
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46 &select_name,
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47 NULL, /* create configuration */
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48 ngx_select_init_conf, /* init configuration */
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49
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50 {
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51 ngx_select_add_event, /* add an event */
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52 ngx_select_del_event, /* delete an event */
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53 ngx_select_add_event, /* enable an event */
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54 ngx_select_del_event, /* disable an event */
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55 NULL, /* add an connection */
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56 NULL, /* delete an connection */
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57 NULL, /* process the changes */
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58 ngx_select_process_events, /* process the events */
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59 ngx_select_init, /* init the events */
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60 ngx_select_done /* done the events */
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61 }
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62
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63 };
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64
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65 ngx_module_t ngx_select_module = {
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58
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66 NGX_MODULE_V1,
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0
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67 &ngx_select_module_ctx, /* module context */
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68 NULL, /* module directives */
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69 NGX_EVENT_MODULE, /* module type */
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90
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70 NULL, /* init master */
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0
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71 NULL, /* init module */
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90
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72 NULL, /* init process */
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73 NULL, /* init thread */
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74 NULL, /* exit thread */
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75 NULL, /* exit process */
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76 NULL, /* exit master */
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77 NGX_MODULE_V1_PADDING
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0
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78 };
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79
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80
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50
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81 static ngx_int_t
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82 ngx_select_init(ngx_cycle_t *cycle)
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0
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83 {
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84 ngx_event_t **index;
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85
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86 if (event_index == NULL) {
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87 FD_ZERO(&master_read_fd_set);
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88 FD_ZERO(&master_write_fd_set);
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89 nevents = 0;
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90 }
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91
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92 if (ngx_process == NGX_PROCESS_WORKER
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93 || cycle->old_cycle == NULL
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94 || cycle->old_cycle->connection_n < cycle->connection_n)
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95 {
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50
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96 index = ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n,
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97 cycle->log);
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98 if (index == NULL) {
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99 return NGX_ERROR;
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100 }
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0
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101
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102 if (event_index) {
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103 ngx_memcpy(index, event_index, sizeof(ngx_event_t *) * nevents);
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104 ngx_free(event_index);
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105 }
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106 event_index = index;
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107
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108 #if 0
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109 if (ready_index) {
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110 ngx_free(ready_index);
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111 }
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50
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112
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113 ready_index = ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n,
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114 cycle->log);
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115 if (ready_index == NULL) {
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116 return NGX_ERROR;
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117 }
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0
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118 #endif
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119 }
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120
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121 ngx_io = ngx_os_io;
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122
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123 ngx_event_actions = ngx_select_module_ctx.actions;
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124
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125 ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_ONESHOT_EVENT;
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126
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10
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127 #if (NGX_WIN32)
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0
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128 max_read = max_write = 0;
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129 #else
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130 max_fd = -1;
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131 #endif
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132
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133 return NGX_OK;
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134 }
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135
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136
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50
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137 static void
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138 ngx_select_done(ngx_cycle_t *cycle)
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0
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139 {
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140 ngx_free(event_index);
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141 #if 0
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142 ngx_free(ready_index);
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143 #endif
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144
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145 event_index = NULL;
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146 }
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147
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148
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50
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149 static ngx_int_t
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150 ngx_select_add_event(ngx_event_t *ev, int event, u_int flags)
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0
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151 {
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152 ngx_connection_t *c;
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153
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154 c = ev->data;
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155
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156 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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157 "select add event fd:%d ev:%d", c->fd, event);
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158
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159 if (ev->index != NGX_INVALID_INDEX) {
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160 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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161 "select event fd:%d ev:%d is already set", c->fd, event);
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162 return NGX_OK;
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163 }
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164
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10
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165 #if (NGX_WIN32)
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0
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166
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167 if ((event == NGX_READ_EVENT) && (max_read >= FD_SETSIZE)
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168 || (event == NGX_WRITE_EVENT) && (max_write >= FD_SETSIZE))
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169 {
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170 ngx_log_error(NGX_LOG_ERR, ev->log, 0,
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171 "maximum number of descriptors "
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172 "supported by select() is %d", FD_SETSIZE);
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173 return NGX_ERROR;
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174 }
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175
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176 if (event == NGX_READ_EVENT) {
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177 FD_SET(c->fd, &master_read_fd_set);
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178 max_read++;
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179
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180 } else if (event == NGX_WRITE_EVENT) {
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181 FD_SET(c->fd, &master_write_fd_set);
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182 max_write++;
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183 }
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184
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185 #else
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186
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187 if (event == NGX_READ_EVENT) {
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188 FD_SET(c->fd, &master_read_fd_set);
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189
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190 } else if (event == NGX_WRITE_EVENT) {
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191 FD_SET(c->fd, &master_write_fd_set);
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192 }
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193
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194 if (max_fd != -1 && max_fd < c->fd) {
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195 max_fd = c->fd;
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196 }
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197
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198 #endif
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199
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200 ev->active = 1;
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201 ev->oneshot = (u_char) ((flags & NGX_ONESHOT_EVENT) ? 1 : 0);
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202
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203 event_index[nevents] = ev;
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204 ev->index = nevents;
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205 nevents++;
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206
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207 return NGX_OK;
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208 }
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209
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210
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50
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211 static ngx_int_t
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212 ngx_select_del_event(ngx_event_t *ev, int event, u_int flags)
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0
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213 {
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214 ngx_connection_t *c;
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215
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216 c = ev->data;
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217
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218 ev->active = 0;
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219
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220 if (ev->index == NGX_INVALID_INDEX) {
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221 return NGX_OK;
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222 }
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223
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224 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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225 "select del event fd:%d ev:%d", c->fd, event);
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226
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10
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227 #if (NGX_WIN32)
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0
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228
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229 if (event == NGX_READ_EVENT) {
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230 FD_CLR(c->fd, &master_read_fd_set);
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231 max_read--;
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232
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233 } else if (event == NGX_WRITE_EVENT) {
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234 FD_CLR(c->fd, &master_write_fd_set);
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235 max_write--;
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236 }
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237
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238 #else
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239
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240 if (event == NGX_READ_EVENT) {
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241 FD_CLR(c->fd, &master_read_fd_set);
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242
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243 } else if (event == NGX_WRITE_EVENT) {
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244 FD_CLR(c->fd, &master_write_fd_set);
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245 }
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246
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247 if (max_fd == c->fd) {
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248 max_fd = -1;
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249 }
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250
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251 #endif
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252
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253 if (ev->index < (u_int) --nevents) {
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254 event_index[ev->index] = event_index[nevents];
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255 event_index[ev->index]->index = ev->index;
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256 }
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257
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258 ev->index = NGX_INVALID_INDEX;
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259
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260 return NGX_OK;
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261 }
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262
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263
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50
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264 static ngx_int_t
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265 ngx_select_process_events(ngx_cycle_t *cycle)
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0
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266 {
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267 int ready, nready;
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268 ngx_uint_t i, found, lock, expire;
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269 ngx_err_t err;
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270 ngx_msec_t timer;
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271 ngx_event_t *ev;
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272 ngx_connection_t *c;
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273 ngx_epoch_msec_t delta;
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274 struct timeval tv, *tp;
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18
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275 #if (NGX_HAVE_SELECT_CHANGE_TIMEOUT)
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0
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276 static ngx_epoch_msec_t deltas = 0;
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277 #endif
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278
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279 for ( ;; ) {
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280 timer = ngx_event_find_timer();
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281
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282 if (timer != 0) {
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283 break;
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284 }
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285
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286 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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287 "select expired timer");
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288
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289 ngx_event_expire_timers((ngx_msec_t)
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290 (ngx_elapsed_msec - ngx_old_elapsed_msec));
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291 }
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292
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293 ngx_old_elapsed_msec = ngx_elapsed_msec;
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294
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295 expire = 1;
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296
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10
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297 #if !(NGX_WIN32)
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0
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298
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299 if (ngx_accept_mutex) {
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300 if (ngx_accept_disabled > 0) {
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301 ngx_accept_disabled--;
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302
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303 } else {
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304 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
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305 return NGX_ERROR;
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306 }
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307
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308 if (ngx_accept_mutex_held == 0
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309 && (timer == NGX_TIMER_INFINITE
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310 || timer > ngx_accept_mutex_delay))
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311 {
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312 timer = ngx_accept_mutex_delay;
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313 expire = 0;
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314 }
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315 }
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316 }
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317
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318 if (max_fd == -1) {
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319 for (i = 0; i < nevents; i++) {
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320 c = event_index[i]->data;
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321 if (max_fd < c->fd) {
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322 max_fd = c->fd;
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323 }
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324 }
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325
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326 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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327 "change max_fd: %d", max_fd);
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328 }
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329
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330 #endif
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331
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332 #if (NGX_DEBUG)
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333 if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
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334 for (i = 0; i < nevents; i++) {
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335 ev = event_index[i];
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336 c = ev->data;
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337 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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338 "select event: fd:%d wr:%d", c->fd, ev->write);
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339 }
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340
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10
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341 #if !(NGX_WIN32)
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0
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342 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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343 "max_fd: %d", max_fd);
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344 #endif
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345 }
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346 #endif
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347
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348 if (timer == NGX_TIMER_INFINITE) {
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349 tp = NULL;
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350 expire = 0;
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351
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352 } else {
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353 tv.tv_sec = timer / 1000;
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354 tv.tv_usec = (timer % 1000) * 1000;
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355 tp = &tv;
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356 }
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357
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358 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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359 "select timer: %d", timer);
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360
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361 work_read_fd_set = master_read_fd_set;
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362 work_write_fd_set = master_write_fd_set;
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363
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36
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364 #if 1
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0
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365 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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36
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366 /*
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367 * (void *) disables "dereferencing type-punned
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368 * pointer will break strict-aliasing rules
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369 */
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370 "select read fd_set: %08Xd",
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371 *(int *) (void *) &work_read_fd_set);
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372 #endif
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0
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373
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10
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374 #if (NGX_WIN32)
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0
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375 ready = select(0, &work_read_fd_set, &work_write_fd_set, NULL, tp);
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376 #else
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377 ready = select(max_fd + 1, &work_read_fd_set, &work_write_fd_set, NULL, tp);
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378 #endif
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379
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380 if (ready == -1) {
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381 err = ngx_socket_errno;
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382 } else {
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383 err = 0;
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384 }
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385
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18
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386 #if (NGX_HAVE_SELECT_CHANGE_TIMEOUT)
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0
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387
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388 if (timer != NGX_TIMER_INFINITE) {
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389 delta = timer - (tv.tv_sec * 1000 + tv.tv_usec / 1000);
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390
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391 /*
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392 * learn the real time and update the cached time
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393 * if the sum of the last deltas overcomes 1 second
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394 */
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395
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396 deltas += delta;
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397 if (deltas > 1000) {
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398 ngx_gettimeofday(&tv);
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399 ngx_time_update(tv.tv_sec);
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400 deltas = tv.tv_usec / 1000;
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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 } else {
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405 ngx_elapsed_msec += delta;
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406 }
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407
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408 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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409 "select timer: %d, delta: %d", timer, (int) delta);
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410
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411 } else {
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412 delta = 0;
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413 ngx_gettimeofday(&tv);
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414 ngx_time_update(tv.tv_sec);
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415
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416 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
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|
|
417 + tv.tv_usec / 1000 - ngx_start_msec;
|
|
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418
|
|
|
419 if (ready == 0) {
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|
|
420 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
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421 "select() returned no events without timeout");
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|
|
422 ngx_accept_mutex_unlock();
|
|
|
423 return NGX_ERROR;
|
|
|
424 }
|
|
|
425 }
|
|
|
426
|
|
18
|
427 #else /* !(NGX_HAVE_SELECT_CHANGE_TIMEOUT) */
|
|
0
|
428
|
|
|
429 ngx_gettimeofday(&tv);
|
|
|
430 ngx_time_update(tv.tv_sec);
|
|
|
431
|
|
|
432 delta = ngx_elapsed_msec;
|
|
|
433 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
|
|
|
434 + tv.tv_usec / 1000 - ngx_start_msec;
|
|
|
435
|
|
|
436 if (timer != NGX_TIMER_INFINITE) {
|
|
|
437 delta = ngx_elapsed_msec - delta;
|
|
|
438
|
|
|
439 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
440 "select timer: %d, delta: %d", timer, (int) delta);
|
|
|
441
|
|
|
442 } else {
|
|
|
443 if (ready == 0) {
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|
|
444 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
445 "select() returned no events without timeout");
|
|
|
446 ngx_accept_mutex_unlock();
|
|
|
447 return NGX_ERROR;
|
|
|
448 }
|
|
|
449 }
|
|
|
450
|
|
18
|
451 #endif /* NGX_HAVE_SELECT_CHANGE_TIMEOUT */
|
|
0
|
452
|
|
|
453 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
454 "select ready %d", ready);
|
|
|
455
|
|
|
456 if (err) {
|
|
10
|
457 #if (NGX_WIN32)
|
|
0
|
458 ngx_log_error(NGX_LOG_ALERT, cycle->log, err, "select() failed");
|
|
|
459 #else
|
|
|
460 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
|
|
461 cycle->log, err, "select() failed");
|
|
|
462 #endif
|
|
|
463 ngx_accept_mutex_unlock();
|
|
|
464 return NGX_ERROR;
|
|
|
465 }
|
|
|
466
|
|
|
467
|
|
|
468 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
469 ngx_accept_mutex_unlock();
|
|
|
470 return NGX_ERROR;
|
|
|
471 }
|
|
|
472
|
|
|
473 lock = 1;
|
|
|
474 nready = 0;
|
|
|
475
|
|
|
476 for (i = 0; i < nevents; i++) {
|
|
|
477 ev = event_index[i];
|
|
|
478 c = ev->data;
|
|
|
479 found = 0;
|
|
|
480
|
|
|
481 if (ev->write) {
|
|
|
482 if (FD_ISSET(c->fd, &work_write_fd_set)) {
|
|
|
483 found = 1;
|
|
|
484 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
485 "select write %d", c->fd);
|
|
|
486 }
|
|
|
487
|
|
|
488 } else {
|
|
|
489 if (FD_ISSET(c->fd, &work_read_fd_set)) {
|
|
|
490 found = 1;
|
|
|
491 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
492 "select read %d", c->fd);
|
|
|
493 }
|
|
|
494 }
|
|
|
495
|
|
|
496 if (found) {
|
|
|
497 ev->ready = 1;
|
|
|
498
|
|
|
499 if (ev->oneshot) {
|
|
|
500 if (ev->timer_set) {
|
|
|
501 ngx_del_timer(ev);
|
|
|
502 }
|
|
|
503
|
|
|
504 if (ev->write) {
|
|
|
505 ngx_select_del_event(ev, NGX_WRITE_EVENT, 0);
|
|
|
506 } else {
|
|
|
507 ngx_select_del_event(ev, NGX_READ_EVENT, 0);
|
|
|
508 }
|
|
|
509 }
|
|
|
510
|
|
|
511 if (ev->accept) {
|
|
|
512 ev->next = accept_events;
|
|
|
513 accept_events = ev;
|
|
|
514 } else {
|
|
|
515 ngx_post_event(ev);
|
|
|
516 }
|
|
|
517
|
|
|
518 nready++;
|
|
|
519
|
|
|
520 #if 0
|
|
|
521 ready_index[nready++] = ev;
|
|
|
522 #endif
|
|
|
523 }
|
|
|
524 }
|
|
|
525
|
|
|
526 #if 0
|
|
|
527 for (i = 0; i < nready; i++) {
|
|
|
528 ev = ready_index[i];
|
|
|
529 ready--;
|
|
|
530
|
|
|
531 if (!ev->active) {
|
|
|
532 continue;
|
|
|
533 }
|
|
|
534
|
|
|
535 ev->ready = 1;
|
|
|
536
|
|
|
537 if (ev->oneshot) {
|
|
|
538 if (ev->timer_set) {
|
|
|
539 ngx_del_timer(ev);
|
|
|
540 }
|
|
|
541
|
|
|
542 if (ev->write) {
|
|
|
543 ngx_select_del_event(ev, NGX_WRITE_EVENT, 0);
|
|
|
544 } else {
|
|
|
545 ngx_select_del_event(ev, NGX_READ_EVENT, 0);
|
|
|
546 }
|
|
|
547 }
|
|
|
548
|
|
58
|
549 ev->handler(ev);
|
|
0
|
550 }
|
|
|
551 #endif
|
|
|
552
|
|
|
553 ev = accept_events;
|
|
|
554
|
|
|
555 for ( ;; ) {
|
|
|
556
|
|
|
557 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
10
|
558 "accept event %p", ev);
|
|
0
|
559
|
|
|
560 if (ev == NULL) {
|
|
|
561 break;
|
|
|
562 }
|
|
|
563
|
|
|
564 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
565
|
|
58
|
566 ev->handler(ev);
|
|
0
|
567
|
|
|
568 if (ngx_accept_disabled > 0) {
|
|
|
569 lock = 0;
|
|
|
570 break;
|
|
|
571 }
|
|
|
572
|
|
|
573 ev = ev->next;
|
|
|
574
|
|
|
575 if (ev == NULL) {
|
|
|
576 lock = 0;
|
|
|
577 break;
|
|
|
578 }
|
|
|
579
|
|
|
580 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
581 ngx_accept_mutex_unlock();
|
|
|
582 return NGX_ERROR;
|
|
|
583 }
|
|
|
584 }
|
|
|
585
|
|
|
586 ngx_accept_mutex_unlock();
|
|
|
587 accept_events = NULL;
|
|
|
588
|
|
|
589 if (lock) {
|
|
|
590 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
591 }
|
|
|
592
|
|
|
593 if (ready != nready) {
|
|
|
594 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "select ready != events");
|
|
|
595 }
|
|
|
596
|
|
|
597 if (expire && delta) {
|
|
|
598 ngx_event_expire_timers((ngx_msec_t) delta);
|
|
|
599 }
|
|
|
600
|
|
|
601 if (!ngx_threaded) {
|
|
|
602 ngx_event_process_posted(cycle);
|
|
|
603 }
|
|
|
604
|
|
|
605 return NGX_OK;
|
|
|
606 }
|
|
|
607
|
|
|
608
|
|
50
|
609 static char *
|
|
|
610 ngx_select_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
0
|
611 {
|
|
|
612 ngx_event_conf_t *ecf;
|
|
|
613
|
|
|
614 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
|
|
|
615
|
|
|
616 if (ecf->use != ngx_select_module.ctx_index) {
|
|
|
617 return NGX_CONF_OK;
|
|
|
618 }
|
|
|
619
|
|
|
620 /* disable warning: the default FD_SETSIZE is 1024U in FreeBSD 5.x */
|
|
|
621
|
|
10
|
622 #if !(NGX_WIN32)
|
|
0
|
623 if ((unsigned) ecf->connections > FD_SETSIZE) {
|
|
|
624 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
|
625 "the maximum number of files "
|
|
|
626 "supported by select() is " ngx_value(FD_SETSIZE));
|
|
|
627 return NGX_CONF_ERROR;
|
|
|
628 }
|
|
|
629 #endif
|
|
|
630
|
|
10
|
631 #if (NGX_THREADS) && !(NGX_WIN32)
|
|
0
|
632 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
|
633 "select() is not supported in the threaded mode");
|
|
|
634 return NGX_CONF_ERROR;
|
|
|
635 #else
|
|
|
636 return NGX_CONF_OK;
|
|
|
637 #endif
|
|
|
638 }
|
