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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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58
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53 NGX_MODULE_V1,
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0
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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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90
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57 NULL, /* init master */
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0
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58 NULL, /* init module */
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90
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59 NULL, /* init process */
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60 NULL, /* init thread */
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61 NULL, /* exit thread */
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62 NULL, /* exit process */
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63 NULL, /* exit master */
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64 NGX_MODULE_V1_PADDING
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0
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65 };
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66
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67
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68
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48
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69 static ngx_int_t
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70 ngx_poll_init(ngx_cycle_t *cycle)
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0
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71 {
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72 struct pollfd *list;
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73
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74 if (event_list == NULL) {
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75 nevents = 0;
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76 }
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77
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78 if (ngx_process == NGX_PROCESS_WORKER
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79 || cycle->old_cycle == NULL
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80 || cycle->old_cycle->connection_n < cycle->connection_n)
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81 {
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50
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82 list = ngx_alloc(sizeof(struct pollfd) * cycle->connection_n,
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83 cycle->log);
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84 if (list == NULL) {
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85 return NGX_ERROR;
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86 }
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0
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87
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88 if (event_list) {
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89 ngx_memcpy(list, event_list, sizeof(ngx_event_t *) * nevents);
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90 ngx_free(event_list);
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91 }
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92
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93 event_list = list;
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94
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95 #if 0
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96 if (ready_index) {
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97 ngx_free(ready_index);
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98 }
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99
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50
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100 ready_index = ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n,
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101 cycle->log);
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102 if (ready_index == NULL) {
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103 return NGX_ERROR;
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104 }
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0
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105 #endif
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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_poll_module_ctx.actions;
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111
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112 ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_ONESHOT_EVENT;
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113
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114 return NGX_OK;
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115 }
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116
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117
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48
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118 static void
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119 ngx_poll_done(ngx_cycle_t *cycle)
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0
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120 {
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121 ngx_free(event_list);
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122 #if 0
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123 ngx_free(ready_index);
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124 #endif
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125
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126 event_list = NULL;
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127 #if 0
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128 ready_index = NULL;
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129 #endif
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130 }
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131
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132
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48
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133 static ngx_int_t
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134 ngx_poll_add_event(ngx_event_t *ev, int event, u_int flags)
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0
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135 {
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136 ngx_event_t *e;
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137 ngx_connection_t *c;
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138
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139 c = ev->data;
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140
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141 ev->active = 1;
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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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145 "poll event fd:%d ev:%d is already set", c->fd, event);
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146 return NGX_OK;
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147 }
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148
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149 if (event == NGX_READ_EVENT) {
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150 e = c->write;
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151 #if (NGX_READ_EVENT != POLLIN)
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152 event = POLLIN;
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153 #endif
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154
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155 } else {
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156 e = c->read;
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157 #if (NGX_WRITE_EVENT != POLLOUT)
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158 event = POLLOUT;
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159 #endif
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160 }
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161
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162 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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163 "poll add event: fd:%d ev:%d", c->fd, event);
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164
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165 if (e == NULL || e->index == NGX_INVALID_INDEX) {
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166 event_list[nevents].fd = c->fd;
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167 event_list[nevents].events = event;
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168 event_list[nevents].revents = 0;
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169
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170 ev->index = nevents;
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171 nevents++;
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172
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173 } else {
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174 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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175 "poll add index: %d", e->index);
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176
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177 event_list[e->index].events |= event;
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178 ev->index = e->index;
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179 }
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180
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181 ev->oneshot = (flags & NGX_ONESHOT_EVENT) ? 1 : 0;
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182
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183 return NGX_OK;
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184 }
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185
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186
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48
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187 static ngx_int_t
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188 ngx_poll_del_event(ngx_event_t *ev, int event, u_int flags)
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0
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189 {
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190 ngx_uint_t i;
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191 ngx_cycle_t **cycle;
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192 ngx_event_t *e;
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193 ngx_connection_t *c;
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194
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195 c = ev->data;
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196
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197 ev->active = 0;
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198
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199 if (ev->index == NGX_INVALID_INDEX) {
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200 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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201 "poll event fd:%d ev:%d is already deleted",
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202 c->fd, event);
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203 return NGX_OK;
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204 }
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205
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206 if (event == NGX_READ_EVENT) {
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207 e = c->write;
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208 #if (NGX_READ_EVENT != POLLIN)
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209 event = POLLIN;
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210 #endif
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211
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212 } else {
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213 e = c->read;
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214 #if (NGX_WRITE_EVENT != POLLOUT)
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215 event = POLLOUT;
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216 #endif
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217 }
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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 "poll del event: fd:%d ev:%d", c->fd, event);
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221
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222 if (e == NULL || e->index == NGX_INVALID_INDEX) {
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223 nevents--;
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224
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225 if (ev->index < (u_int) nevents) {
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226
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227 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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228 "index: copy event %d to %d", nevents, ev->index);
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229
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230 event_list[ev->index] = event_list[nevents];
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231
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232 c = &ngx_cycle->connections[event_list[nevents].fd];
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233
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234 if (c->fd == -1) {
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235 cycle = ngx_old_cycles.elts;
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236 for (i = 0; i < ngx_old_cycles.nelts; i++) {
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237 if (cycle[i] == NULL) {
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238 continue;
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239 }
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240 c = &cycle[i]->connections[event_list[nevents].fd];
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241 if (c->fd != -1) {
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242 break;
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243 }
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244 }
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245 }
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246
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247 if (c->fd == -1) {
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248 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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249 "unexpected last event");
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250
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251 } else {
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252 if (c->read->index == (u_int) nevents) {
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253 c->read->index = ev->index;
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254 }
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255
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256 if (c->write->index == (u_int) nevents) {
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257 c->write->index = ev->index;
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258 }
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259 }
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260 }
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261
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262 } else {
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263 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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264 "poll del index: %d", e->index);
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265
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266 event_list[e->index].events &= ~event;
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267 }
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268
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269 ev->index = NGX_INVALID_INDEX;
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270
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271 return NGX_OK;
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272 }
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273
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274
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48
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275 static ngx_int_t
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276 ngx_poll_process_events(ngx_cycle_t *cycle)
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0
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277 {
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32
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278 int ready, revents;
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0
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279 ngx_int_t i, nready;
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280 ngx_uint_t n, found, lock, expire;
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281 ngx_msec_t timer;
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282 ngx_err_t err;
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283 ngx_cycle_t **old_cycle;
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284 ngx_event_t *ev;
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285 ngx_epoch_msec_t delta;
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286 ngx_connection_t *c;
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287 struct timeval tv;
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288
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289 for ( ;; ) {
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290 timer = ngx_event_find_timer();
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291
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292 if (timer != 0) {
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293 break;
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294 }
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295
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296 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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297 "poll expired timer");
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298
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299 ngx_event_expire_timers((ngx_msec_t)
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300 (ngx_elapsed_msec - ngx_old_elapsed_msec));
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301 }
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302
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303 /* NGX_TIMER_INFINITE == INFTIM */
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304
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305 if (timer == NGX_TIMER_INFINITE) {
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306 expire = 0;
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307
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308 } else {
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309 expire = 1;
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310 }
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311
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312 ngx_old_elapsed_msec = ngx_elapsed_msec;
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313
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314 #if (NGX_DEBUG0)
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315 if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
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316 for (i = 0; i < nevents; i++) {
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317 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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318 "poll: %d: fd:%d ev:%04Xd",
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0
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319 i, event_list[i].fd, event_list[i].events);
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320 }
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321 }
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322 #endif
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323
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324 if (ngx_accept_mutex) {
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325 if (ngx_accept_disabled > 0) {
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326 ngx_accept_disabled--;
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327
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328 } else {
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329 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
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330 return NGX_ERROR;
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331 }
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332
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333 if (ngx_accept_mutex_held == 0
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334 && (timer == NGX_TIMER_INFINITE
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335 || timer > ngx_accept_mutex_delay))
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336 {
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337 timer = ngx_accept_mutex_delay;
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338 expire = 0;
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339 }
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340 }
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341 }
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342
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343 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll timer: %d", timer);
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344
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345 ready = poll(event_list, (u_int) nevents, (int) timer);
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346
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347 if (ready == -1) {
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348 err = ngx_errno;
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349 } else {
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350 err = 0;
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351 }
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352
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353 ngx_gettimeofday(&tv);
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354 ngx_time_update(tv.tv_sec);
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355
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356 delta = ngx_elapsed_msec;
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357 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
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358 + tv.tv_usec / 1000 - ngx_start_msec;
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359
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360 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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361 "poll ready %d of %d", ready, nevents);
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362
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363 if (err) {
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364 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
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365 cycle->log, err, "poll() failed");
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366 ngx_accept_mutex_unlock();
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367 return NGX_ERROR;
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368 }
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369
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370 if (timer != NGX_TIMER_INFINITE) {
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371 delta = ngx_elapsed_msec - delta;
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372
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373 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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374 "poll timer: %d, delta: %d", timer, (int) delta);
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375 } else {
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376 if (ready == 0) {
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377 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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378 "poll() returned no events without timeout");
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379 ngx_accept_mutex_unlock();
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380 return NGX_ERROR;
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381 }
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382 }
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383
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384 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
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385 ngx_accept_mutex_unlock();
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386 return NGX_ERROR;
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387 }
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388
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389 lock = 1;
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390 nready = 0;
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391
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392 for (i = 0; i < nevents && ready; i++) {
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393
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32
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394 revents = event_list[i].revents;
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395
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0
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396 #if 0
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397 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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398 "poll: %d: fd:%d ev:%04Xd rev:%04Xd",
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32
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399 i, event_list[i].fd, event_list[i].events, revents);
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0
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400 #else
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32
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401 if (revents) {
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0
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402 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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403 "poll: %d: fd:%d ev:%04Xd rev:%04Xd",
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32
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404 i, event_list[i].fd, event_list[i].events, revents);
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0
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405 }
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406 #endif
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407
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32
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408 if (revents & POLLNVAL) {
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0
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409 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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10
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410 "poll() error fd:%d ev:%04Xd rev:%04Xd",
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32
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411 event_list[i].fd, event_list[i].events, revents);
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0
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412 }
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413
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32
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414 if (revents & ~(POLLIN|POLLOUT|POLLERR|POLLHUP|POLLNVAL)) {
|
|
0
|
415 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
10
|
416 "strange poll() events fd:%d ev:%04Xd rev:%04Xd",
|
|
32
|
417 event_list[i].fd, event_list[i].events, revents);
|
|
0
|
418 }
|
|
|
419
|
|
|
420 if (event_list[i].fd == -1) {
|
|
|
421 /*
|
|
|
422 * the disabled event, a workaround for our possible bug,
|
|
|
423 * see the comment below
|
|
|
424 */
|
|
|
425 continue;
|
|
|
426 }
|
|
|
427
|
|
|
428 c = &ngx_cycle->connections[event_list[i].fd];
|
|
|
429
|
|
|
430 if (c->fd == -1) {
|
|
|
431 old_cycle = ngx_old_cycles.elts;
|
|
|
432 for (n = 0; n < ngx_old_cycles.nelts; n++) {
|
|
|
433 if (old_cycle[n] == NULL) {
|
|
|
434 continue;
|
|
|
435 }
|
|
|
436 c = &old_cycle[n]->connections[event_list[i].fd];
|
|
|
437 if (c->fd != -1) {
|
|
|
438 break;
|
|
|
439 }
|
|
|
440 }
|
|
|
441 }
|
|
|
442
|
|
|
443 if (c->fd == -1) {
|
|
|
444 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "unexpected event");
|
|
|
445
|
|
|
446 /*
|
|
|
447 * it is certainly our fault and it should be investigated,
|
|
|
448 * in the meantime we disable this event to avoid a CPU spinning
|
|
|
449 */
|
|
|
450
|
|
|
451 if (i == nevents - 1) {
|
|
|
452 nevents--;
|
|
|
453 } else {
|
|
|
454 event_list[i].fd = -1;
|
|
|
455 }
|
|
|
456
|
|
|
457 continue;
|
|
|
458 }
|
|
|
459
|
|
32
|
460 if ((revents & (POLLERR|POLLHUP|POLLNVAL))
|
|
|
461 && (revents & (POLLIN|POLLOUT)) == 0)
|
|
|
462 {
|
|
|
463 /*
|
|
|
464 * if the error events were returned without POLLIN or POLLOUT,
|
|
|
465 * then add these flags to handle the events at least in one
|
|
|
466 * active handler
|
|
|
467 */
|
|
|
468
|
|
|
469 revents |= POLLIN|POLLOUT;
|
|
|
470 }
|
|
|
471
|
|
0
|
472 found = 0;
|
|
|
473
|
|
32
|
474 if (revents & POLLIN) {
|
|
0
|
475 found = 1;
|
|
|
476
|
|
|
477 ev = c->read;
|
|
|
478 ev->ready = 1;
|
|
|
479
|
|
|
480 if (ev->oneshot) {
|
|
|
481 if (ev->timer_set) {
|
|
|
482 ngx_del_timer(ev);
|
|
|
483 }
|
|
|
484 ngx_poll_del_event(ev, NGX_READ_EVENT, 0);
|
|
|
485 }
|
|
|
486
|
|
|
487 if (ev->accept) {
|
|
|
488 ev->next = accept_events;
|
|
|
489 accept_events = ev;
|
|
|
490 } else {
|
|
|
491 ngx_post_event(ev);
|
|
|
492 }
|
|
|
493
|
|
|
494 #if 0
|
|
|
495 ready_index[nready++] = c->read;
|
|
|
496 #endif
|
|
|
497 }
|
|
|
498
|
|
32
|
499 if (revents & POLLOUT) {
|
|
0
|
500 found = 1;
|
|
|
501 ev = c->write;
|
|
|
502 ev->ready = 1;
|
|
|
503
|
|
|
504 if (ev->oneshot) {
|
|
|
505 if (ev->timer_set) {
|
|
|
506 ngx_del_timer(ev);
|
|
|
507 }
|
|
|
508 ngx_poll_del_event(ev, NGX_WRITE_EVENT, 0);
|
|
|
509 }
|
|
|
510
|
|
|
511 ngx_post_event(ev);
|
|
|
512 #if 0
|
|
|
513 ready_index[nready++] = c->write;
|
|
|
514 #endif
|
|
|
515 }
|
|
|
516
|
|
|
517 if (found) {
|
|
|
518 ready--;
|
|
|
519 continue;
|
|
|
520 }
|
|
|
521 }
|
|
|
522
|
|
|
523 #if 0
|
|
|
524 for (i = 0; i < nready; i++) {
|
|
|
525 ev = ready_index[i];
|
|
|
526
|
|
|
527 if (!ev->active) {
|
|
|
528 continue;
|
|
|
529 }
|
|
|
530
|
|
|
531 ev->ready = 1;
|
|
|
532
|
|
|
533 if (ev->oneshot) {
|
|
|
534 if (ev->timer_set) {
|
|
|
535 ngx_del_timer(ev);
|
|
|
536 }
|
|
|
537
|
|
|
538 if (ev->write) {
|
|
|
539 ngx_poll_del_event(ev, NGX_WRITE_EVENT, 0);
|
|
|
540 } else {
|
|
|
541 ngx_poll_del_event(ev, NGX_READ_EVENT, 0);
|
|
|
542 }
|
|
|
543 }
|
|
|
544
|
|
58
|
545 ev->handler(ev);
|
|
0
|
546 }
|
|
|
547 #endif
|
|
|
548
|
|
|
549 ev = accept_events;
|
|
|
550
|
|
|
551 for ( ;; ) {
|
|
|
552
|
|
|
553 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
10
|
554 "accept event %p", ev);
|
|
0
|
555
|
|
|
556 if (ev == NULL) {
|
|
|
557 break;
|
|
|
558 }
|
|
|
559
|
|
|
560 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
561
|
|
58
|
562 ev->handler(ev);
|
|
0
|
563
|
|
|
564 if (ngx_accept_disabled > 0) {
|
|
|
565 lock = 0;
|
|
|
566 break;
|
|
|
567 }
|
|
|
568
|
|
|
569 ev = ev->next;
|
|
|
570
|
|
|
571 if (ev == NULL) {
|
|
|
572 lock = 0;
|
|
|
573 break;
|
|
|
574 }
|
|
|
575
|
|
|
576 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
577 ngx_accept_mutex_unlock();
|
|
|
578 return NGX_ERROR;
|
|
|
579 }
|
|
|
580
|
|
|
581 }
|
|
|
582
|
|
|
583 ngx_accept_mutex_unlock();
|
|
|
584 accept_events = NULL;
|
|
|
585
|
|
|
586 if (lock) {
|
|
|
587 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
588 }
|
|
|
589
|
|
|
590 if (ready != 0) {
|
|
|
591 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "poll ready != events");
|
|
|
592 }
|
|
|
593
|
|
|
594 if (expire && delta) {
|
|
|
595 ngx_event_expire_timers((ngx_msec_t) delta);
|
|
|
596 }
|
|
|
597
|
|
|
598 if (!ngx_threaded) {
|
|
|
599 ngx_event_process_posted(cycle);
|
|
|
600 }
|
|
|
601
|
|
|
602 return nready;
|
|
|
603 }
|
|
|
604
|
|
|
605
|
|
48
|
606 static char *
|
|
|
607 ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
0
|
608 {
|
|
|
609 ngx_event_conf_t *ecf;
|
|
|
610
|
|
|
611 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
|
|
|
612
|
|
|
613 if (ecf->use != ngx_poll_module.ctx_index) {
|
|
|
614 return NGX_CONF_OK;
|
|
|
615 }
|
|
|
616
|
|
|
617 #if (NGX_THREADS)
|
|
|
618
|
|
|
619 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
|
620 "poll() is not supported in the threaded mode");
|
|
|
621 return NGX_CONF_ERROR;
|
|
|
622
|
|
|
623 #else
|
|
|
624
|
|
|
625 return NGX_CONF_OK;
|
|
|
626
|
|
|
627 #endif
|
|
|
628 }
|
