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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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112
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12 static ngx_int_t ngx_select_init(ngx_cycle_t *cycle, ngx_msec_t timer);
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0
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13 static void ngx_select_done(ngx_cycle_t *cycle);
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324
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14 static ngx_int_t ngx_select_add_event(ngx_event_t *ev, ngx_int_t event,
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15 ngx_uint_t flags);
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16 static ngx_int_t ngx_select_del_event(ngx_event_t *ev, ngx_int_t event,
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17 ngx_uint_t flags);
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112
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18 static ngx_int_t ngx_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
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19 ngx_uint_t flags);
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484
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20 static void ngx_select_repair_fd_sets(ngx_cycle_t *cycle);
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0
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21 static char *ngx_select_init_conf(ngx_cycle_t *cycle, void *conf);
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22
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23
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24 static fd_set master_read_fd_set;
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25 static fd_set master_write_fd_set;
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26 static fd_set work_read_fd_set;
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27 static fd_set work_write_fd_set;
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28
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324
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29 static ngx_int_t max_fd;
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0
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30 static ngx_uint_t nevents;
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31
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32 static ngx_event_t **event_index;
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33
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34
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35 static ngx_str_t select_name = ngx_string("select");
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36
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37 ngx_event_module_t ngx_select_module_ctx = {
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38 &select_name,
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39 NULL, /* create configuration */
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40 ngx_select_init_conf, /* init configuration */
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41
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42 {
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43 ngx_select_add_event, /* add an event */
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44 ngx_select_del_event, /* delete an event */
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45 ngx_select_add_event, /* enable an event */
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46 ngx_select_del_event, /* disable an event */
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47 NULL, /* add an connection */
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48 NULL, /* delete an connection */
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49 NULL, /* process the changes */
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50 ngx_select_process_events, /* process the events */
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51 ngx_select_init, /* init the events */
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52 ngx_select_done /* done the events */
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53 }
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54
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55 };
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56
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57 ngx_module_t ngx_select_module = {
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58
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58 NGX_MODULE_V1,
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0
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59 &ngx_select_module_ctx, /* module context */
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60 NULL, /* module directives */
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61 NGX_EVENT_MODULE, /* module type */
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90
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62 NULL, /* init master */
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0
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63 NULL, /* init module */
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90
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64 NULL, /* init process */
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65 NULL, /* init thread */
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66 NULL, /* exit thread */
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67 NULL, /* exit process */
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68 NULL, /* exit master */
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69 NGX_MODULE_V1_PADDING
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0
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70 };
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71
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72
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50
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73 static ngx_int_t
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112
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74 ngx_select_init(ngx_cycle_t *cycle, ngx_msec_t timer)
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0
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75 {
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76 ngx_event_t **index;
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77
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78 if (event_index == NULL) {
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79 FD_ZERO(&master_read_fd_set);
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80 FD_ZERO(&master_write_fd_set);
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81 nevents = 0;
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82 }
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83
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84 if (ngx_process == NGX_PROCESS_WORKER
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85 || cycle->old_cycle == NULL
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86 || cycle->old_cycle->connection_n < cycle->connection_n)
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87 {
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50
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88 index = ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n,
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89 cycle->log);
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90 if (index == NULL) {
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91 return NGX_ERROR;
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92 }
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0
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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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112
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98
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0
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99 event_index = index;
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100 }
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101
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102 ngx_io = ngx_os_io;
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103
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104 ngx_event_actions = ngx_select_module_ctx.actions;
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105
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112
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106 ngx_event_flags = NGX_USE_LEVEL_EVENT;
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0
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107
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108 max_fd = -1;
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109
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110 return NGX_OK;
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111 }
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112
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113
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50
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114 static void
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115 ngx_select_done(ngx_cycle_t *cycle)
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0
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116 {
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117 ngx_free(event_index);
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118
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119 event_index = NULL;
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120 }
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121
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122
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50
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123 static ngx_int_t
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324
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124 ngx_select_add_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
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0
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125 {
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126 ngx_connection_t *c;
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127
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128 c = ev->data;
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129
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130 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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324
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131 "select add event fd:%d ev:%i", c->fd, event);
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0
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132
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133 if (ev->index != NGX_INVALID_INDEX) {
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134 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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324
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135 "select event fd:%d ev:%i is already set", c->fd, event);
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0
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136 return NGX_OK;
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137 }
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138
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486
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139 if ((event == NGX_READ_EVENT && ev->write)
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140 || (event == NGX_WRITE_EVENT && !ev->write))
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141 {
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142 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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143 "invalid select %s event fd:%d ev:%i",
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144 ev->write ? "write" : "read", c->fd, event);
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145 return NGX_ERROR;
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146 }
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147
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0
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148 if (event == NGX_READ_EVENT) {
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149 FD_SET(c->fd, &master_read_fd_set);
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150
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151 } else if (event == NGX_WRITE_EVENT) {
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152 FD_SET(c->fd, &master_write_fd_set);
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153 }
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154
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155 if (max_fd != -1 && max_fd < c->fd) {
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156 max_fd = c->fd;
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157 }
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158
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159 ev->active = 1;
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160
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161 event_index[nevents] = ev;
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162 ev->index = nevents;
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163 nevents++;
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164
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165 return NGX_OK;
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166 }
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167
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168
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50
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169 static ngx_int_t
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324
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170 ngx_select_del_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
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0
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171 {
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486
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172 ngx_event_t *e;
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0
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173 ngx_connection_t *c;
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174
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175 c = ev->data;
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176
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177 ev->active = 0;
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178
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179 if (ev->index == NGX_INVALID_INDEX) {
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180 return NGX_OK;
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181 }
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182
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183 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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324
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184 "select del event fd:%d ev:%i", c->fd, event);
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0
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185
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186 if (event == NGX_READ_EVENT) {
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187 FD_CLR(c->fd, &master_read_fd_set);
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188
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189 } else if (event == NGX_WRITE_EVENT) {
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190 FD_CLR(c->fd, &master_write_fd_set);
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191 }
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192
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193 if (max_fd == c->fd) {
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194 max_fd = -1;
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195 }
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196
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324
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197 if (ev->index < --nevents) {
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486
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198 e = event_index[nevents];
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199 event_index[ev->index] = e;
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200 e->index = ev->index;
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0
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201 }
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202
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203 ev->index = NGX_INVALID_INDEX;
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204
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205 return NGX_OK;
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206 }
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207
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208
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50
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209 static ngx_int_t
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112
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210 ngx_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
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211 ngx_uint_t flags)
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0
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212 {
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484
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213 int ready, nready;
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214 ngx_err_t err;
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215 ngx_uint_t i, found;
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216 ngx_event_t *ev, **queue;
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217 struct timeval tv, *tp;
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218 ngx_connection_t *c;
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0
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219
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220 if (max_fd == -1) {
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221 for (i = 0; i < nevents; i++) {
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222 c = event_index[i]->data;
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223 if (max_fd < c->fd) {
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224 max_fd = c->fd;
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225 }
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226 }
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227
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228 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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229 "change max_fd: %d", max_fd);
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230 }
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231
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232 #if (NGX_DEBUG)
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233 if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
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234 for (i = 0; i < nevents; i++) {
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235 ev = event_index[i];
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236 c = ev->data;
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237 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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238 "select event: fd:%d wr:%d", c->fd, ev->write);
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239 }
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240
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241 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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242 "max_fd: %d", max_fd);
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243 }
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244 #endif
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245
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246 if (timer == NGX_TIMER_INFINITE) {
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247 tp = NULL;
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248
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249 } else {
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106
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250 tv.tv_sec = (long) (timer / 1000);
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251 tv.tv_usec = (long) ((timer % 1000) * 1000);
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0
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252 tp = &tv;
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253 }
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254
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255 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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106
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256 "select timer: %M", timer);
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0
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257
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258 work_read_fd_set = master_read_fd_set;
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259 work_write_fd_set = master_write_fd_set;
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260
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261 ready = select(max_fd + 1, &work_read_fd_set, &work_write_fd_set, NULL, tp);
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112
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262
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0
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263 if (ready == -1) {
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264 err = ngx_socket_errno;
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265 } else {
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266 err = 0;
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267 }
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268
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112
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269 if (flags & NGX_UPDATE_TIME) {
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270 ngx_time_update(0, 0);
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271 }
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0
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272
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273 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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274 "select ready %d", ready);
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275
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112
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276 if (err) {
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356
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277 ngx_uint_t level;
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278
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112
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279 if (err == NGX_EINTR) {
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280
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281 if (ngx_event_timer_alarm) {
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282 ngx_event_timer_alarm = 0;
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283 return NGX_OK;
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284 }
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126
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285
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112
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286 level = NGX_LOG_INFO;
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126
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287
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288 } else {
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112
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289 level = NGX_LOG_ALERT;
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290 }
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291
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292 ngx_log_error(level, cycle->log, err, "select() failed");
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484
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293
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294 if (err == EBADF) {
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295 ngx_select_repair_fd_sets(cycle);
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296 }
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297
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0
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298 return NGX_ERROR;
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299 }
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300
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116
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301 if (ready == 0) {
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302 if (timer != NGX_TIMER_INFINITE) {
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303 return NGX_OK;
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304 }
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305
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306 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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307 "select() returned no events without timeout");
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308 return NGX_ERROR;
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112
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309 }
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310
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311 ngx_mutex_lock(ngx_posted_events_mutex);
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312
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0
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313 nready = 0;
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314
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315 for (i = 0; i < nevents; i++) {
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316 ev = event_index[i];
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317 c = ev->data;
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318 found = 0;
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319
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320 if (ev->write) {
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321 if (FD_ISSET(c->fd, &work_write_fd_set)) {
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322 found = 1;
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323 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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324 "select write %d", c->fd);
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325 }
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326
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327 } else {
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328 if (FD_ISSET(c->fd, &work_read_fd_set)) {
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329 found = 1;
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330 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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331 "select read %d", c->fd);
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332 }
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333 }
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334
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335 if (found) {
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336 ev->ready = 1;
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337
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112
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338 queue = (ngx_event_t **) (ev->accept ? &ngx_posted_accept_events:
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339 &ngx_posted_events);
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126
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340 ngx_locked_post_event(ev, queue);
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0
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341
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342 nready++;
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343 }
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344 }
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345
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112
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346 ngx_mutex_unlock(ngx_posted_events_mutex);
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0
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347
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348 if (ready != nready) {
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484
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349 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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350 "select ready != events: %d:%d", ready, nready);
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351
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352 ngx_select_repair_fd_sets(cycle);
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0
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353 }
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354
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355 return NGX_OK;
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356 }
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357
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358
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484
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359 static void
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360 ngx_select_repair_fd_sets(ngx_cycle_t *cycle)
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361 {
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362 int n;
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363 socklen_t len;
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364 ngx_err_t err;
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365 ngx_socket_t s;
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366
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367 for (s = 0; s <= max_fd; s++) {
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368
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369 if (FD_ISSET(s, &master_read_fd_set) == 0) {
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370 continue;
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371 }
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372
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373 len = sizeof(int);
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374
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375 if (getsockopt(s, SOL_SOCKET, SO_TYPE, &n, &len) == -1) {
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376 err = ngx_socket_errno;
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377
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378 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
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379 "invalid descriptor #%d in read fd_set", s);
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380
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381 FD_CLR(s, &master_read_fd_set);
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382 }
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383 }
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384
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385 for (s = 0; s <= max_fd; s++) {
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386
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387 if (FD_ISSET(s, &master_write_fd_set) == 0) {
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388 continue;
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389 }
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390
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391 len = sizeof(int);
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392
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393 if (getsockopt(s, SOL_SOCKET, SO_TYPE, &n, &len) == -1) {
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394 err = ngx_socket_errno;
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395
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396 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
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397 "invalid descriptor #%d in write fd_set", s);
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398
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399 FD_CLR(s, &master_write_fd_set);
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400 }
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401 }
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402
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403 max_fd = -1;
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404 }
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405
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406
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50
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407 static char *
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408 ngx_select_init_conf(ngx_cycle_t *cycle, void *conf)
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0
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409 {
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|
410 ngx_event_conf_t *ecf;
|
|
|
411
|
|
|
412 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
|
|
|
413
|
|
|
414 if (ecf->use != ngx_select_module.ctx_index) {
|
|
|
415 return NGX_CONF_OK;
|
|
|
416 }
|
|
|
417
|
|
|
418 /* disable warning: the default FD_SETSIZE is 1024U in FreeBSD 5.x */
|
|
|
419
|
|
384
|
420 if (cycle->connection_n > FD_SETSIZE) {
|
|
0
|
421 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
|
422 "the maximum number of files "
|
|
384
|
423 "supported by select() is %ud", FD_SETSIZE);
|
|
0
|
424 return NGX_CONF_ERROR;
|
|
|
425 }
|
|
112
|
426
|
|
488
|
427 #if (NGX_THREADS)
|
|
112
|
428
|
|
0
|
429 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
|
430 "select() is not supported in the threaded mode");
|
|
|
431 return NGX_CONF_ERROR;
|
|
112
|
432
|
|
0
|
433 #else
|
|
112
|
434
|
|
0
|
435 return NGX_CONF_OK;
|
|
112
|
436
|
|
0
|
437 #endif
|
|
|
438 }
|
