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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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112
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13 static ngx_int_t ngx_select_init(ngx_cycle_t *cycle, ngx_msec_t timer);
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0
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14 static void ngx_select_done(ngx_cycle_t *cycle);
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324
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15 static ngx_int_t ngx_select_add_event(ngx_event_t *ev, ngx_int_t event,
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16 ngx_uint_t flags);
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17 static ngx_int_t ngx_select_del_event(ngx_event_t *ev, ngx_int_t event,
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18 ngx_uint_t flags);
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112
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19 static ngx_int_t ngx_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
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20 ngx_uint_t flags);
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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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10
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29 #if (NGX_WIN32)
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324
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30 static ngx_uint_t max_read;
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31 static ngx_uint_t max_write;
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0
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32 #else
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324
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33 static ngx_int_t max_fd;
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0
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34 #endif
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35
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36 static ngx_uint_t nevents;
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37
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38 static ngx_event_t **event_index;
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39
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40
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41 static ngx_str_t select_name = ngx_string("select");
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42
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43 ngx_event_module_t ngx_select_module_ctx = {
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44 &select_name,
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45 NULL, /* create configuration */
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46 ngx_select_init_conf, /* init configuration */
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47
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48 {
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49 ngx_select_add_event, /* add an event */
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50 ngx_select_del_event, /* delete an event */
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51 ngx_select_add_event, /* enable an event */
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52 ngx_select_del_event, /* disable an event */
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53 NULL, /* add an connection */
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54 NULL, /* delete an connection */
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55 NULL, /* process the changes */
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56 ngx_select_process_events, /* process the events */
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57 ngx_select_init, /* init the events */
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58 ngx_select_done /* done the events */
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59 }
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60
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61 };
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62
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63 ngx_module_t ngx_select_module = {
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58
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64 NGX_MODULE_V1,
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0
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65 &ngx_select_module_ctx, /* module context */
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66 NULL, /* module directives */
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67 NGX_EVENT_MODULE, /* module type */
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90
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68 NULL, /* init master */
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0
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69 NULL, /* init module */
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90
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70 NULL, /* init process */
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71 NULL, /* init thread */
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72 NULL, /* exit thread */
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73 NULL, /* exit process */
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74 NULL, /* exit master */
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75 NGX_MODULE_V1_PADDING
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0
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76 };
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77
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78
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50
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79 static ngx_int_t
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112
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80 ngx_select_init(ngx_cycle_t *cycle, ngx_msec_t timer)
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0
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81 {
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82 ngx_event_t **index;
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83
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84 if (event_index == NULL) {
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85 FD_ZERO(&master_read_fd_set);
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86 FD_ZERO(&master_write_fd_set);
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87 nevents = 0;
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88 }
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89
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90 if (ngx_process == NGX_PROCESS_WORKER
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91 || cycle->old_cycle == NULL
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92 || cycle->old_cycle->connection_n < cycle->connection_n)
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93 {
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50
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94 index = ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n,
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95 cycle->log);
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96 if (index == NULL) {
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97 return NGX_ERROR;
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98 }
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0
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99
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100 if (event_index) {
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101 ngx_memcpy(index, event_index, sizeof(ngx_event_t *) * nevents);
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102 ngx_free(event_index);
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103 }
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112
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104
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0
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105 event_index = index;
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106 }
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107
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108 ngx_io = ngx_os_io;
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109
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110 ngx_event_actions = ngx_select_module_ctx.actions;
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111
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112
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112 ngx_event_flags = NGX_USE_LEVEL_EVENT;
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0
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113
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10
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114 #if (NGX_WIN32)
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115 max_read = max_write = 0;
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116 #else
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117 max_fd = -1;
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118 #endif
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119
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120 return NGX_OK;
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121 }
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122
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123
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50
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124 static void
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125 ngx_select_done(ngx_cycle_t *cycle)
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0
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126 {
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127 ngx_free(event_index);
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128
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129 event_index = NULL;
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130 }
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131
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132
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50
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133 static ngx_int_t
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324
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134 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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135 {
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136 ngx_connection_t *c;
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137
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138 c = ev->data;
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139
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140 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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324
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141 "select add event fd:%d ev:%i", c->fd, event);
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0
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142
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143 if (ev->index != NGX_INVALID_INDEX) {
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144 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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324
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145 "select event fd:%d ev:%i is already set", c->fd, event);
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0
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146 return NGX_OK;
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147 }
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148
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10
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149 #if (NGX_WIN32)
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0
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150
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151 if ((event == NGX_READ_EVENT) && (max_read >= FD_SETSIZE)
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152 || (event == NGX_WRITE_EVENT) && (max_write >= FD_SETSIZE))
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153 {
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154 ngx_log_error(NGX_LOG_ERR, ev->log, 0,
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155 "maximum number of descriptors "
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156 "supported by select() is %d", FD_SETSIZE);
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157 return NGX_ERROR;
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158 }
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159
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160 if (event == NGX_READ_EVENT) {
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161 FD_SET(c->fd, &master_read_fd_set);
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162 max_read++;
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163
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164 } else if (event == NGX_WRITE_EVENT) {
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165 FD_SET(c->fd, &master_write_fd_set);
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166 max_write++;
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167 }
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168
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169 #else
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170
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171 if (event == NGX_READ_EVENT) {
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172 FD_SET(c->fd, &master_read_fd_set);
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173
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174 } else if (event == NGX_WRITE_EVENT) {
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175 FD_SET(c->fd, &master_write_fd_set);
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176 }
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177
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178 if (max_fd != -1 && max_fd < c->fd) {
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179 max_fd = c->fd;
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180 }
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181
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182 #endif
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183
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184 ev->active = 1;
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185
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186 event_index[nevents] = ev;
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187 ev->index = nevents;
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188 nevents++;
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189
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190 return NGX_OK;
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191 }
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192
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193
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50
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194 static ngx_int_t
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324
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195 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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196 {
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197 ngx_connection_t *c;
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198
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199 c = ev->data;
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200
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201 ev->active = 0;
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202
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203 if (ev->index == NGX_INVALID_INDEX) {
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204 return NGX_OK;
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205 }
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206
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207 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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324
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208 "select del event fd:%d ev:%i", c->fd, event);
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0
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209
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10
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210 #if (NGX_WIN32)
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211
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212 if (event == NGX_READ_EVENT) {
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213 FD_CLR(c->fd, &master_read_fd_set);
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214 max_read--;
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215
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216 } else if (event == NGX_WRITE_EVENT) {
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217 FD_CLR(c->fd, &master_write_fd_set);
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218 max_write--;
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219 }
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220
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221 #else
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222
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223 if (event == NGX_READ_EVENT) {
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224 FD_CLR(c->fd, &master_read_fd_set);
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225
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226 } else if (event == NGX_WRITE_EVENT) {
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227 FD_CLR(c->fd, &master_write_fd_set);
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228 }
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229
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230 if (max_fd == c->fd) {
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231 max_fd = -1;
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232 }
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233
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234 #endif
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235
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324
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236 if (ev->index < --nevents) {
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237 event_index[ev->index] = event_index[nevents];
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238 event_index[ev->index]->index = ev->index;
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239 }
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240
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241 ev->index = NGX_INVALID_INDEX;
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242
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243 return NGX_OK;
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244 }
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245
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246
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50
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247 static ngx_int_t
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112
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248 ngx_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
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249 ngx_uint_t flags)
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0
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250 {
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112
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251 int ready, nready;
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252 ngx_uint_t i, found;
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253 ngx_err_t err;
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254 ngx_event_t *ev, **queue;
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255 ngx_connection_t *c;
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256 struct timeval tv, *tp;
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0
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257
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10
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258 #if !(NGX_WIN32)
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0
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259
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260 if (max_fd == -1) {
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261 for (i = 0; i < nevents; i++) {
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262 c = event_index[i]->data;
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263 if (max_fd < c->fd) {
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264 max_fd = c->fd;
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265 }
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266 }
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267
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268 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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269 "change max_fd: %d", max_fd);
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270 }
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271
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272 #endif
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273
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274 #if (NGX_DEBUG)
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275 if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
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276 for (i = 0; i < nevents; i++) {
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277 ev = event_index[i];
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278 c = ev->data;
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279 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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280 "select event: fd:%d wr:%d", c->fd, ev->write);
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281 }
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282
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10
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283 #if !(NGX_WIN32)
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284 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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285 "max_fd: %d", max_fd);
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286 #endif
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287 }
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288 #endif
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289
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290 if (timer == NGX_TIMER_INFINITE) {
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291 tp = NULL;
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292
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293 } else {
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106
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294 tv.tv_sec = (long) (timer / 1000);
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295 tv.tv_usec = (long) ((timer % 1000) * 1000);
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0
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296 tp = &tv;
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297 }
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298
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299 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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106
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300 "select timer: %M", timer);
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0
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301
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302 work_read_fd_set = master_read_fd_set;
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303 work_write_fd_set = master_write_fd_set;
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304
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36
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305 #if 1
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0
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306 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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36
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307 /*
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308 * (void *) disables "dereferencing type-punned
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309 * pointer will break strict-aliasing rules
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310 */
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311 "select read fd_set: %08Xd",
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312 *(int *) (void *) &work_read_fd_set);
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313 #endif
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0
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314
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10
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315 #if (NGX_WIN32)
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112
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316
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0
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317 ready = select(0, &work_read_fd_set, &work_write_fd_set, NULL, tp);
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112
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318
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0
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319 #else
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112
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320
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321 ready = select(max_fd + 1, &work_read_fd_set, &work_write_fd_set, NULL, tp);
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112
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322
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0
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323 #endif
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324
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325 if (ready == -1) {
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326 err = ngx_socket_errno;
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327 } else {
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328 err = 0;
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329 }
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330
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112
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331 if (flags & NGX_UPDATE_TIME) {
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332 ngx_time_update(0, 0);
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333 }
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0
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334
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335 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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336 "select ready %d", ready);
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337
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112
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338 #if (NGX_WIN32)
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339
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0
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340 if (err) {
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341 ngx_log_error(NGX_LOG_ALERT, cycle->log, err, "select() failed");
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342 return NGX_ERROR;
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343 }
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344
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112
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345 #else
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0
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346
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112
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347 if (err) {
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356
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348 ngx_uint_t level;
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349
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112
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350 if (err == NGX_EINTR) {
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351
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352 if (ngx_event_timer_alarm) {
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353 ngx_event_timer_alarm = 0;
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354 return NGX_OK;
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355 }
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126
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356
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112
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357 level = NGX_LOG_INFO;
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126
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358
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359 } else {
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112
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360 level = NGX_LOG_ALERT;
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361 }
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362
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363 ngx_log_error(level, cycle->log, err, "select() failed");
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0
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364 return NGX_ERROR;
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365 }
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366
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112
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367 #endif
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368
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116
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369 if (ready == 0) {
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370 if (timer != NGX_TIMER_INFINITE) {
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371 return NGX_OK;
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372 }
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373
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374 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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375 "select() returned no events without timeout");
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376 return NGX_ERROR;
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112
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377 }
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378
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379 ngx_mutex_lock(ngx_posted_events_mutex);
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380
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0
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381 nready = 0;
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382
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383 for (i = 0; i < nevents; i++) {
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384 ev = event_index[i];
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385 c = ev->data;
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386 found = 0;
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387
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388 if (ev->write) {
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389 if (FD_ISSET(c->fd, &work_write_fd_set)) {
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390 found = 1;
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391 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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392 "select write %d", c->fd);
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393 }
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394
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395 } else {
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396 if (FD_ISSET(c->fd, &work_read_fd_set)) {
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397 found = 1;
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398 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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399 "select read %d", c->fd);
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400 }
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401 }
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402
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403 if (found) {
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404 ev->ready = 1;
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405
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112
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406 queue = (ngx_event_t **) (ev->accept ? &ngx_posted_accept_events:
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407 &ngx_posted_events);
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126
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408 ngx_locked_post_event(ev, queue);
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0
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409
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410 nready++;
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411 }
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412 }
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413
|
|
112
|
414 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
0
|
415
|
|
|
416 if (ready != nready) {
|
|
|
417 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "select ready != events");
|
|
|
418 }
|
|
|
419
|
|
|
420 return NGX_OK;
|
|
|
421 }
|
|
|
422
|
|
|
423
|
|
50
|
424 static char *
|
|
|
425 ngx_select_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
0
|
426 {
|
|
|
427 ngx_event_conf_t *ecf;
|
|
|
428
|
|
|
429 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
|
|
|
430
|
|
|
431 if (ecf->use != ngx_select_module.ctx_index) {
|
|
|
432 return NGX_CONF_OK;
|
|
|
433 }
|
|
|
434
|
|
|
435 /* disable warning: the default FD_SETSIZE is 1024U in FreeBSD 5.x */
|
|
|
436
|
|
10
|
437 #if !(NGX_WIN32)
|
|
112
|
438
|
|
0
|
439 if ((unsigned) ecf->connections > FD_SETSIZE) {
|
|
|
440 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
|
441 "the maximum number of files "
|
|
|
442 "supported by select() is " ngx_value(FD_SETSIZE));
|
|
|
443 return NGX_CONF_ERROR;
|
|
|
444 }
|
|
112
|
445
|
|
0
|
446 #endif
|
|
|
447
|
|
10
|
448 #if (NGX_THREADS) && !(NGX_WIN32)
|
|
112
|
449
|
|
0
|
450 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
|
451 "select() is not supported in the threaded mode");
|
|
|
452 return NGX_CONF_ERROR;
|
|
112
|
453
|
|
0
|
454 #else
|
|
112
|
455
|
|
0
|
456 return NGX_CONF_OK;
|
|
112
|
457
|
|
0
|
458 #endif
|
|
|
459 }
|
