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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 static ngx_int_t ngx_poll_init(ngx_cycle_t *cycle);
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13 static void ngx_poll_done(ngx_cycle_t *cycle);
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14 static ngx_int_t ngx_poll_add_event(ngx_event_t *ev, int event, u_int flags);
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15 static ngx_int_t ngx_poll_del_event(ngx_event_t *ev, int event, u_int flags);
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16 static ngx_int_t ngx_poll_process_events(ngx_cycle_t *cycle);
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17 static char *ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf);
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18
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19
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20 static struct pollfd *event_list;
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21 static int nevents;
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22
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23 #if 0
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24 static ngx_event_t **ready_index;
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25 #endif
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26
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27 static ngx_event_t *accept_events;
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28
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29
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30 static ngx_str_t poll_name = ngx_string("poll");
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31
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32 ngx_event_module_t ngx_poll_module_ctx = {
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33 &poll_name,
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34 NULL, /* create configuration */
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35 ngx_poll_init_conf, /* init configuration */
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36
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37 {
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38 ngx_poll_add_event, /* add an event */
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39 ngx_poll_del_event, /* delete an event */
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40 ngx_poll_add_event, /* enable an event */
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41 ngx_poll_del_event, /* disable an event */
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42 NULL, /* add an connection */
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43 NULL, /* delete an connection */
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44 NULL, /* process the changes */
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45 ngx_poll_process_events, /* process the events */
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46 ngx_poll_init, /* init the events */
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47 ngx_poll_done /* done the events */
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48 }
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49
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50 };
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51
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52 ngx_module_t ngx_poll_module = {
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53 NGX_MODULE,
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54 &ngx_poll_module_ctx, /* module context */
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55 NULL, /* module directives */
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56 NGX_EVENT_MODULE, /* module type */
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57 NULL, /* init module */
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58 NULL /* init process */
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59 };
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60
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61
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62
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48
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63 static ngx_int_t
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64 ngx_poll_init(ngx_cycle_t *cycle)
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0
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65 {
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66 struct pollfd *list;
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67
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68 if (event_list == NULL) {
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69 nevents = 0;
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70 }
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71
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72 if (ngx_process == NGX_PROCESS_WORKER
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73 || cycle->old_cycle == NULL
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74 || cycle->old_cycle->connection_n < cycle->connection_n)
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75 {
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76 ngx_test_null(list,
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77 ngx_alloc(sizeof(struct pollfd) * cycle->connection_n,
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78 cycle->log),
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79 NGX_ERROR);
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80
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81 if (event_list) {
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82 ngx_memcpy(list, event_list, sizeof(ngx_event_t *) * nevents);
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83 ngx_free(event_list);
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84 }
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85
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86 event_list = list;
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87
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88 #if 0
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89 if (ready_index) {
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90 ngx_free(ready_index);
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91 }
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92
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93 ngx_test_null(ready_index,
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94 ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n,
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95 cycle->log),
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96 NGX_ERROR);
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97 #endif
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98 }
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99
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100 ngx_io = ngx_os_io;
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101
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102 ngx_event_actions = ngx_poll_module_ctx.actions;
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103
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104 ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_ONESHOT_EVENT;
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105
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106 return NGX_OK;
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107 }
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108
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109
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48
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110 static void
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111 ngx_poll_done(ngx_cycle_t *cycle)
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0
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112 {
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113 ngx_free(event_list);
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114 #if 0
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115 ngx_free(ready_index);
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116 #endif
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117
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118 event_list = NULL;
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119 #if 0
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120 ready_index = NULL;
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121 #endif
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122 }
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123
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124
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48
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125 static ngx_int_t
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126 ngx_poll_add_event(ngx_event_t *ev, int event, u_int flags)
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0
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127 {
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128 ngx_event_t *e;
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129 ngx_connection_t *c;
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130
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131 c = ev->data;
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132
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133 ev->active = 1;
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134
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135 if (ev->index != NGX_INVALID_INDEX) {
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136 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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137 "poll event fd:%d ev:%d is already set", c->fd, event);
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138 return NGX_OK;
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139 }
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140
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141 if (event == NGX_READ_EVENT) {
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142 e = c->write;
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143 #if (NGX_READ_EVENT != POLLIN)
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144 event = POLLIN;
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145 #endif
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146
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147 } else {
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148 e = c->read;
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149 #if (NGX_WRITE_EVENT != POLLOUT)
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150 event = POLLOUT;
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151 #endif
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152 }
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153
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154 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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155 "poll add event: fd:%d ev:%d", c->fd, event);
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156
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157 if (e == NULL || e->index == NGX_INVALID_INDEX) {
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158 event_list[nevents].fd = c->fd;
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159 event_list[nevents].events = event;
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160 event_list[nevents].revents = 0;
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161
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162 ev->index = nevents;
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163 nevents++;
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164
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165 } else {
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166 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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167 "poll add index: %d", e->index);
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168
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169 event_list[e->index].events |= event;
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170 ev->index = e->index;
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171 }
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172
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173 ev->oneshot = (flags & NGX_ONESHOT_EVENT) ? 1 : 0;
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174
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175 return NGX_OK;
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176 }
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177
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178
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48
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179 static ngx_int_t
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180 ngx_poll_del_event(ngx_event_t *ev, int event, u_int flags)
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0
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181 {
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182 ngx_uint_t i;
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183 ngx_cycle_t **cycle;
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184 ngx_event_t *e;
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185 ngx_connection_t *c;
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186
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187 c = ev->data;
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188
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189 ev->active = 0;
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190
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191 if (ev->index == NGX_INVALID_INDEX) {
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192 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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193 "poll event fd:%d ev:%d is already deleted",
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194 c->fd, event);
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195 return NGX_OK;
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196 }
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197
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198 if (event == NGX_READ_EVENT) {
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199 e = c->write;
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200 #if (NGX_READ_EVENT != POLLIN)
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201 event = POLLIN;
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202 #endif
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203
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204 } else {
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205 e = c->read;
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206 #if (NGX_WRITE_EVENT != POLLOUT)
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207 event = POLLOUT;
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208 #endif
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209 }
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210
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211 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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212 "poll del event: fd:%d ev:%d", c->fd, event);
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213
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214 if (e == NULL || e->index == NGX_INVALID_INDEX) {
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215 nevents--;
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216
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217 if (ev->index < (u_int) nevents) {
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218
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219 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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220 "index: copy event %d to %d", nevents, ev->index);
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221
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222 event_list[ev->index] = event_list[nevents];
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223
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224 c = &ngx_cycle->connections[event_list[nevents].fd];
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225
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226 if (c->fd == -1) {
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227 cycle = ngx_old_cycles.elts;
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228 for (i = 0; i < ngx_old_cycles.nelts; i++) {
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229 if (cycle[i] == NULL) {
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230 continue;
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231 }
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232 c = &cycle[i]->connections[event_list[nevents].fd];
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233 if (c->fd != -1) {
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234 break;
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235 }
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236 }
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237 }
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238
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239 if (c->fd == -1) {
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240 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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241 "unexpected last event");
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242
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243 } else {
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244 if (c->read->index == (u_int) nevents) {
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245 c->read->index = ev->index;
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246 }
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247
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248 if (c->write->index == (u_int) nevents) {
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249 c->write->index = ev->index;
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250 }
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251 }
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252 }
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253
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254 } else {
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255 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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256 "poll del index: %d", e->index);
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257
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258 event_list[e->index].events &= ~event;
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259 }
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260
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261 ev->index = NGX_INVALID_INDEX;
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262
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263 return NGX_OK;
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264 }
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265
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266
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48
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267 static ngx_int_t
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268 ngx_poll_process_events(ngx_cycle_t *cycle)
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0
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269 {
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32
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270 int ready, revents;
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0
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271 ngx_int_t i, nready;
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272 ngx_uint_t n, found, lock, expire;
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273 ngx_msec_t timer;
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274 ngx_err_t err;
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275 ngx_cycle_t **old_cycle;
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276 ngx_event_t *ev;
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277 ngx_epoch_msec_t delta;
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278 ngx_connection_t *c;
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279 struct timeval tv;
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280
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281 for ( ;; ) {
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282 timer = ngx_event_find_timer();
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283
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284 if (timer != 0) {
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285 break;
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286 }
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287
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288 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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289 "poll expired timer");
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290
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291 ngx_event_expire_timers((ngx_msec_t)
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292 (ngx_elapsed_msec - ngx_old_elapsed_msec));
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293 }
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294
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295 /* NGX_TIMER_INFINITE == INFTIM */
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296
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297 if (timer == NGX_TIMER_INFINITE) {
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298 expire = 0;
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299
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300 } else {
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301 expire = 1;
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302 }
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303
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304 ngx_old_elapsed_msec = ngx_elapsed_msec;
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305
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306 #if (NGX_DEBUG0)
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307 if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
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308 for (i = 0; i < nevents; i++) {
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309 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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310 "poll: %d: fd:%d ev:%04Xd",
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0
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311 i, event_list[i].fd, event_list[i].events);
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312 }
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313 }
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314 #endif
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315
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316 if (ngx_accept_mutex) {
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317 if (ngx_accept_disabled > 0) {
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318 ngx_accept_disabled--;
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319
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320 } else {
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321 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
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322 return NGX_ERROR;
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323 }
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324
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325 if (ngx_accept_mutex_held == 0
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326 && (timer == NGX_TIMER_INFINITE
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327 || timer > ngx_accept_mutex_delay))
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328 {
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329 timer = ngx_accept_mutex_delay;
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330 expire = 0;
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331 }
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332 }
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333 }
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334
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335 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll timer: %d", timer);
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336
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337 ready = poll(event_list, (u_int) nevents, (int) timer);
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338
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339 if (ready == -1) {
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340 err = ngx_errno;
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341 } else {
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342 err = 0;
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343 }
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344
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345 ngx_gettimeofday(&tv);
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346 ngx_time_update(tv.tv_sec);
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347
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348 delta = ngx_elapsed_msec;
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349 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
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350 + tv.tv_usec / 1000 - ngx_start_msec;
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351
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352 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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353 "poll ready %d of %d", ready, nevents);
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354
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355 if (err) {
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356 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
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357 cycle->log, err, "poll() failed");
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358 ngx_accept_mutex_unlock();
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359 return NGX_ERROR;
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360 }
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361
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362 if (timer != NGX_TIMER_INFINITE) {
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363 delta = ngx_elapsed_msec - delta;
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364
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365 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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366 "poll timer: %d, delta: %d", timer, (int) delta);
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367 } else {
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368 if (ready == 0) {
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369 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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370 "poll() returned no events without timeout");
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371 ngx_accept_mutex_unlock();
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372 return NGX_ERROR;
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373 }
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374 }
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375
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376 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
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377 ngx_accept_mutex_unlock();
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378 return NGX_ERROR;
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379 }
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380
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381 lock = 1;
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382 nready = 0;
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383
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384 for (i = 0; i < nevents && ready; i++) {
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385
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32
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386 revents = event_list[i].revents;
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387
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0
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388 #if 0
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389 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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390 "poll: %d: fd:%d ev:%04Xd rev:%04Xd",
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32
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391 i, event_list[i].fd, event_list[i].events, revents);
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0
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392 #else
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32
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393 if (revents) {
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0
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394 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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395 "poll: %d: fd:%d ev:%04Xd rev:%04Xd",
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32
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396 i, event_list[i].fd, event_list[i].events, revents);
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0
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397 }
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398 #endif
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399
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32
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400 if (revents & POLLNVAL) {
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0
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401 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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10
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402 "poll() error fd:%d ev:%04Xd rev:%04Xd",
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32
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403 event_list[i].fd, event_list[i].events, revents);
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0
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404 }
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405
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32
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406 if (revents & ~(POLLIN|POLLOUT|POLLERR|POLLHUP|POLLNVAL)) {
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0
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407 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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10
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408 "strange poll() events fd:%d ev:%04Xd rev:%04Xd",
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32
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409 event_list[i].fd, event_list[i].events, revents);
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0
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410 }
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411
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412 if (event_list[i].fd == -1) {
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413 /*
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|
|
414 * the disabled event, a workaround for our possible bug,
|
|
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415 * see the comment below
|
|
|
416 */
|
|
|
417 continue;
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|
|
418 }
|
|
|
419
|
|
|
420 c = &ngx_cycle->connections[event_list[i].fd];
|
|
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421
|
|
|
422 if (c->fd == -1) {
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|
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423 old_cycle = ngx_old_cycles.elts;
|
|
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424 for (n = 0; n < ngx_old_cycles.nelts; n++) {
|
|
|
425 if (old_cycle[n] == NULL) {
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426 continue;
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|
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427 }
|
|
|
428 c = &old_cycle[n]->connections[event_list[i].fd];
|
|
|
429 if (c->fd != -1) {
|
|
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430 break;
|
|
|
431 }
|
|
|
432 }
|
|
|
433 }
|
|
|
434
|
|
|
435 if (c->fd == -1) {
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|
|
436 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "unexpected event");
|
|
|
437
|
|
|
438 /*
|
|
|
439 * it is certainly our fault and it should be investigated,
|
|
|
440 * in the meantime we disable this event to avoid a CPU spinning
|
|
|
441 */
|
|
|
442
|
|
|
443 if (i == nevents - 1) {
|
|
|
444 nevents--;
|
|
|
445 } else {
|
|
|
446 event_list[i].fd = -1;
|
|
|
447 }
|
|
|
448
|
|
|
449 continue;
|
|
|
450 }
|
|
|
451
|
|
32
|
452 if ((revents & (POLLERR|POLLHUP|POLLNVAL))
|
|
|
453 && (revents & (POLLIN|POLLOUT)) == 0)
|
|
|
454 {
|
|
|
455 /*
|
|
|
456 * if the error events were returned without POLLIN or POLLOUT,
|
|
|
457 * then add these flags to handle the events at least in one
|
|
|
458 * active handler
|
|
|
459 */
|
|
|
460
|
|
|
461 revents |= POLLIN|POLLOUT;
|
|
|
462 }
|
|
|
463
|
|
0
|
464 found = 0;
|
|
|
465
|
|
32
|
466 if (revents & POLLIN) {
|
|
0
|
467 found = 1;
|
|
|
468
|
|
|
469 ev = c->read;
|
|
|
470 ev->ready = 1;
|
|
|
471
|
|
|
472 if (ev->oneshot) {
|
|
|
473 if (ev->timer_set) {
|
|
|
474 ngx_del_timer(ev);
|
|
|
475 }
|
|
|
476 ngx_poll_del_event(ev, NGX_READ_EVENT, 0);
|
|
|
477 }
|
|
|
478
|
|
|
479 if (ev->accept) {
|
|
|
480 ev->next = accept_events;
|
|
|
481 accept_events = ev;
|
|
|
482 } else {
|
|
|
483 ngx_post_event(ev);
|
|
|
484 }
|
|
|
485
|
|
|
486 #if 0
|
|
|
487 ready_index[nready++] = c->read;
|
|
|
488 #endif
|
|
|
489 }
|
|
|
490
|
|
32
|
491 if (revents & POLLOUT) {
|
|
0
|
492 found = 1;
|
|
|
493 ev = c->write;
|
|
|
494 ev->ready = 1;
|
|
|
495
|
|
|
496 if (ev->oneshot) {
|
|
|
497 if (ev->timer_set) {
|
|
|
498 ngx_del_timer(ev);
|
|
|
499 }
|
|
|
500 ngx_poll_del_event(ev, NGX_WRITE_EVENT, 0);
|
|
|
501 }
|
|
|
502
|
|
|
503 ngx_post_event(ev);
|
|
|
504 #if 0
|
|
|
505 ready_index[nready++] = c->write;
|
|
|
506 #endif
|
|
|
507 }
|
|
|
508
|
|
|
509 if (found) {
|
|
|
510 ready--;
|
|
|
511 continue;
|
|
|
512 }
|
|
|
513 }
|
|
|
514
|
|
|
515 #if 0
|
|
|
516 for (i = 0; i < nready; i++) {
|
|
|
517 ev = ready_index[i];
|
|
|
518
|
|
|
519 if (!ev->active) {
|
|
|
520 continue;
|
|
|
521 }
|
|
|
522
|
|
|
523 ev->ready = 1;
|
|
|
524
|
|
|
525 if (ev->oneshot) {
|
|
|
526 if (ev->timer_set) {
|
|
|
527 ngx_del_timer(ev);
|
|
|
528 }
|
|
|
529
|
|
|
530 if (ev->write) {
|
|
|
531 ngx_poll_del_event(ev, NGX_WRITE_EVENT, 0);
|
|
|
532 } else {
|
|
|
533 ngx_poll_del_event(ev, NGX_READ_EVENT, 0);
|
|
|
534 }
|
|
|
535 }
|
|
|
536
|
|
|
537 ev->event_handler(ev);
|
|
|
538 }
|
|
|
539 #endif
|
|
|
540
|
|
|
541 ev = accept_events;
|
|
|
542
|
|
|
543 for ( ;; ) {
|
|
|
544
|
|
|
545 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
10
|
546 "accept event %p", ev);
|
|
0
|
547
|
|
|
548 if (ev == NULL) {
|
|
|
549 break;
|
|
|
550 }
|
|
|
551
|
|
|
552 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
553
|
|
|
554 ev->event_handler(ev);
|
|
|
555
|
|
|
556 if (ngx_accept_disabled > 0) {
|
|
|
557 lock = 0;
|
|
|
558 break;
|
|
|
559 }
|
|
|
560
|
|
|
561 ev = ev->next;
|
|
|
562
|
|
|
563 if (ev == NULL) {
|
|
|
564 lock = 0;
|
|
|
565 break;
|
|
|
566 }
|
|
|
567
|
|
|
568 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
569 ngx_accept_mutex_unlock();
|
|
|
570 return NGX_ERROR;
|
|
|
571 }
|
|
|
572
|
|
|
573 }
|
|
|
574
|
|
|
575 ngx_accept_mutex_unlock();
|
|
|
576 accept_events = NULL;
|
|
|
577
|
|
|
578 if (lock) {
|
|
|
579 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
580 }
|
|
|
581
|
|
|
582 if (ready != 0) {
|
|
|
583 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "poll ready != events");
|
|
|
584 }
|
|
|
585
|
|
|
586 if (expire && delta) {
|
|
|
587 ngx_event_expire_timers((ngx_msec_t) delta);
|
|
|
588 }
|
|
|
589
|
|
|
590 if (!ngx_threaded) {
|
|
|
591 ngx_event_process_posted(cycle);
|
|
|
592 }
|
|
|
593
|
|
|
594 return nready;
|
|
|
595 }
|
|
|
596
|
|
|
597
|
|
48
|
598 static char *
|
|
|
599 ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
0
|
600 {
|
|
|
601 ngx_event_conf_t *ecf;
|
|
|
602
|
|
|
603 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
|
|
|
604
|
|
|
605 if (ecf->use != ngx_poll_module.ctx_index) {
|
|
|
606 return NGX_CONF_OK;
|
|
|
607 }
|
|
|
608
|
|
|
609 #if (NGX_THREADS)
|
|
|
610
|
|
|
611 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
|
612 "poll() is not supported in the threaded mode");
|
|
|
613 return NGX_CONF_ERROR;
|
|
|
614
|
|
|
615 #else
|
|
|
616
|
|
|
617 return NGX_CONF_OK;
|
|
|
618
|
|
|
619 #endif
|
|
|
620 }
|
