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