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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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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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112
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17 static ngx_int_t ngx_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
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18 ngx_uint_t flags);
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0
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19 static char *ngx_select_init_conf(ngx_cycle_t *cycle, void *conf);
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20
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21
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22 static fd_set master_read_fd_set;
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23 static fd_set master_write_fd_set;
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24 static fd_set work_read_fd_set;
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25 static fd_set work_write_fd_set;
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26
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10
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27 #if (NGX_WIN32)
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0
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28 static int max_read;
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29 static int max_write;
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30 #else
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31 static int max_fd;
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32 #endif
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33
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34 static ngx_uint_t nevents;
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35
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36 static ngx_event_t **event_index;
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37
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38
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39 static ngx_str_t select_name = ngx_string("select");
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40
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41 ngx_event_module_t ngx_select_module_ctx = {
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42 &select_name,
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43 NULL, /* create configuration */
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44 ngx_select_init_conf, /* init configuration */
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45
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46 {
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47 ngx_select_add_event, /* add an event */
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48 ngx_select_del_event, /* delete an event */
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49 ngx_select_add_event, /* enable an event */
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50 ngx_select_del_event, /* disable an event */
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51 NULL, /* add an connection */
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52 NULL, /* delete an connection */
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53 NULL, /* process the changes */
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54 ngx_select_process_events, /* process the events */
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55 ngx_select_init, /* init the events */
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56 ngx_select_done /* done the events */
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57 }
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58
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59 };
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60
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61 ngx_module_t ngx_select_module = {
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58
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62 NGX_MODULE_V1,
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0
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63 &ngx_select_module_ctx, /* module context */
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64 NULL, /* module directives */
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65 NGX_EVENT_MODULE, /* module type */
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90
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66 NULL, /* init master */
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0
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67 NULL, /* init module */
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90
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68 NULL, /* init process */
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69 NULL, /* init thread */
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70 NULL, /* exit thread */
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71 NULL, /* exit process */
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72 NULL, /* exit master */
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73 NGX_MODULE_V1_PADDING
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0
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74 };
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75
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76
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50
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77 static ngx_int_t
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112
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78 ngx_select_init(ngx_cycle_t *cycle, ngx_msec_t timer)
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0
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79 {
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80 ngx_event_t **index;
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81
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82 if (event_index == NULL) {
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83 FD_ZERO(&master_read_fd_set);
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84 FD_ZERO(&master_write_fd_set);
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85 nevents = 0;
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86 }
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87
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88 if (ngx_process == NGX_PROCESS_WORKER
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89 || cycle->old_cycle == NULL
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90 || cycle->old_cycle->connection_n < cycle->connection_n)
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91 {
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50
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92 index = ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n,
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93 cycle->log);
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94 if (index == NULL) {
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95 return NGX_ERROR;
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96 }
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0
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97
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98 if (event_index) {
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99 ngx_memcpy(index, event_index, sizeof(ngx_event_t *) * nevents);
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100 ngx_free(event_index);
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101 }
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112
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102
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103 event_index = index;
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104 }
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105
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106 ngx_io = ngx_os_io;
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107
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108 ngx_event_actions = ngx_select_module_ctx.actions;
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109
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112
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110 ngx_event_flags = NGX_USE_LEVEL_EVENT;
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0
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111
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10
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112 #if (NGX_WIN32)
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113 max_read = max_write = 0;
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114 #else
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115 max_fd = -1;
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116 #endif
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117
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118 return NGX_OK;
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119 }
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120
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121
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50
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122 static void
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123 ngx_select_done(ngx_cycle_t *cycle)
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0
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124 {
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125 ngx_free(event_index);
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126
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127 event_index = NULL;
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128 }
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129
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130
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50
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131 static ngx_int_t
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132 ngx_select_add_event(ngx_event_t *ev, int event, u_int flags)
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0
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133 {
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134 ngx_connection_t *c;
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135
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136 c = ev->data;
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137
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138 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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139 "select add event fd:%d ev:%d", c->fd, event);
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140
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141 if (ev->index != NGX_INVALID_INDEX) {
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142 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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143 "select event fd:%d ev:%d is already set", c->fd, event);
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144 return NGX_OK;
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145 }
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146
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10
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147 #if (NGX_WIN32)
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0
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148
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149 if ((event == NGX_READ_EVENT) && (max_read >= FD_SETSIZE)
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150 || (event == NGX_WRITE_EVENT) && (max_write >= FD_SETSIZE))
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151 {
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152 ngx_log_error(NGX_LOG_ERR, ev->log, 0,
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153 "maximum number of descriptors "
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154 "supported by select() is %d", FD_SETSIZE);
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155 return NGX_ERROR;
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156 }
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157
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158 if (event == NGX_READ_EVENT) {
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159 FD_SET(c->fd, &master_read_fd_set);
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160 max_read++;
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161
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162 } else if (event == NGX_WRITE_EVENT) {
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163 FD_SET(c->fd, &master_write_fd_set);
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164 max_write++;
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165 }
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166
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167 #else
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168
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169 if (event == NGX_READ_EVENT) {
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170 FD_SET(c->fd, &master_read_fd_set);
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171
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172 } else if (event == NGX_WRITE_EVENT) {
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173 FD_SET(c->fd, &master_write_fd_set);
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174 }
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175
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176 if (max_fd != -1 && max_fd < c->fd) {
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177 max_fd = c->fd;
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178 }
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179
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180 #endif
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181
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182 ev->active = 1;
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183 ev->oneshot = (u_char) ((flags & NGX_ONESHOT_EVENT) ? 1 : 0);
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184
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185 event_index[nevents] = ev;
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186 ev->index = nevents;
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187 nevents++;
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188
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189 return NGX_OK;
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190 }
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191
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192
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50
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193 static ngx_int_t
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194 ngx_select_del_event(ngx_event_t *ev, int event, u_int flags)
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0
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195 {
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196 ngx_connection_t *c;
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197
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198 c = ev->data;
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199
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200 ev->active = 0;
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201
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202 if (ev->index == NGX_INVALID_INDEX) {
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203 return NGX_OK;
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204 }
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205
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206 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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207 "select del event fd:%d ev:%d", c->fd, event);
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208
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10
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209 #if (NGX_WIN32)
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210
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211 if (event == NGX_READ_EVENT) {
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212 FD_CLR(c->fd, &master_read_fd_set);
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213 max_read--;
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214
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215 } else if (event == NGX_WRITE_EVENT) {
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216 FD_CLR(c->fd, &master_write_fd_set);
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217 max_write--;
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218 }
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219
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220 #else
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221
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222 if (event == NGX_READ_EVENT) {
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223 FD_CLR(c->fd, &master_read_fd_set);
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224
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225 } else if (event == NGX_WRITE_EVENT) {
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226 FD_CLR(c->fd, &master_write_fd_set);
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227 }
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228
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229 if (max_fd == c->fd) {
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230 max_fd = -1;
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231 }
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232
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233 #endif
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234
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235 if (ev->index < (u_int) --nevents) {
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236 event_index[ev->index] = event_index[nevents];
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237 event_index[ev->index]->index = ev->index;
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238 }
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239
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240 ev->index = NGX_INVALID_INDEX;
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241
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242 return NGX_OK;
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243 }
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244
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245
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50
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246 static ngx_int_t
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112
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247 ngx_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
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248 ngx_uint_t flags)
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0
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249 {
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112
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250 int ready, nready;
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251 ngx_uint_t i, found;
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252 ngx_err_t err;
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253 ngx_event_t *ev, **queue;
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254 ngx_connection_t *c;
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255 struct timeval tv, *tp;
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256 #if !(NGX_WIN32)
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257 ngx_uint_t level;
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0
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258 #endif
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259
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10
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260 #if !(NGX_WIN32)
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0
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261
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262 if (max_fd == -1) {
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263 for (i = 0; i < nevents; i++) {
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264 c = event_index[i]->data;
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265 if (max_fd < c->fd) {
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266 max_fd = c->fd;
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267 }
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268 }
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269
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270 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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271 "change max_fd: %d", max_fd);
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272 }
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273
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274 #endif
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275
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276 #if (NGX_DEBUG)
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277 if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
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278 for (i = 0; i < nevents; i++) {
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279 ev = event_index[i];
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280 c = ev->data;
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281 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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282 "select event: fd:%d wr:%d", c->fd, ev->write);
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283 }
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284
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285 #if !(NGX_WIN32)
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0
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286 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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287 "max_fd: %d", max_fd);
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288 #endif
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289 }
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290 #endif
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291
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292 if (timer == NGX_TIMER_INFINITE) {
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293 tp = NULL;
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294
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295 } else {
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106
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296 tv.tv_sec = (long) (timer / 1000);
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297 tv.tv_usec = (long) ((timer % 1000) * 1000);
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298 tp = &tv;
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299 }
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300
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301 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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106
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302 "select timer: %M", timer);
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0
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303
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304 work_read_fd_set = master_read_fd_set;
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305 work_write_fd_set = master_write_fd_set;
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306
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36
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307 #if 1
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0
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308 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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36
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309 /*
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310 * (void *) disables "dereferencing type-punned
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311 * pointer will break strict-aliasing rules
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312 */
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313 "select read fd_set: %08Xd",
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314 *(int *) (void *) &work_read_fd_set);
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315 #endif
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0
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316
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10
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317 #if (NGX_WIN32)
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112
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318
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319 ready = select(0, &work_read_fd_set, &work_write_fd_set, NULL, tp);
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112
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320
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0
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321 #else
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112
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322
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323 ready = select(max_fd + 1, &work_read_fd_set, &work_write_fd_set, NULL, tp);
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112
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324
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0
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325 #endif
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326
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327 if (ready == -1) {
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328 err = ngx_socket_errno;
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329 } else {
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330 err = 0;
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331 }
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332
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112
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333 if (flags & NGX_UPDATE_TIME) {
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334 ngx_time_update(0, 0);
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335 }
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0
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336
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337 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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338 "select ready %d", ready);
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339
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112
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340 #if (NGX_WIN32)
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341
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0
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342 if (err) {
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343 ngx_log_error(NGX_LOG_ALERT, cycle->log, err, "select() failed");
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344 return NGX_ERROR;
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345 }
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346
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112
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347 #else
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0
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348
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112
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349 if (err) {
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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
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112
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414 ngx_mutex_unlock(ngx_posted_events_mutex);
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0
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415
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|
|
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 }
|
