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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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92
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112 ngx_event_flags = NGX_USE_LEVEL_EVENT
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113 |NGX_USE_ONESHOT_EVENT
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114 |NGX_USE_FD_EVENT;
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0
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115
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116 return NGX_OK;
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117 }
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118
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119
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48
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120 static void
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121 ngx_poll_done(ngx_cycle_t *cycle)
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0
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122 {
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123 ngx_free(event_list);
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124 #if 0
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125 ngx_free(ready_index);
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126 #endif
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127
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128 event_list = NULL;
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129 #if 0
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130 ready_index = NULL;
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131 #endif
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132 }
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133
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134
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48
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135 static ngx_int_t
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136 ngx_poll_add_event(ngx_event_t *ev, int event, u_int flags)
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0
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137 {
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138 ngx_event_t *e;
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139 ngx_connection_t *c;
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140
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141 c = ev->data;
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142
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143 ev->active = 1;
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144
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145 if (ev->index != NGX_INVALID_INDEX) {
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146 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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147 "poll event fd:%d ev:%d is already set", c->fd, event);
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148 return NGX_OK;
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149 }
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150
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151 if (event == NGX_READ_EVENT) {
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152 e = c->write;
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153 #if (NGX_READ_EVENT != POLLIN)
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154 event = POLLIN;
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155 #endif
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156
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157 } else {
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158 e = c->read;
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159 #if (NGX_WRITE_EVENT != POLLOUT)
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160 event = POLLOUT;
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161 #endif
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162 }
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163
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164 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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165 "poll add event: fd:%d ev:%d", c->fd, event);
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166
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167 if (e == NULL || e->index == NGX_INVALID_INDEX) {
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168 event_list[nevents].fd = c->fd;
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169 event_list[nevents].events = event;
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170 event_list[nevents].revents = 0;
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171
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172 ev->index = nevents;
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173 nevents++;
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174
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175 } else {
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176 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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177 "poll add index: %d", e->index);
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178
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179 event_list[e->index].events |= event;
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180 ev->index = e->index;
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181 }
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182
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183 ev->oneshot = (flags & NGX_ONESHOT_EVENT) ? 1 : 0;
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184
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185 return NGX_OK;
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186 }
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187
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188
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48
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189 static ngx_int_t
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190 ngx_poll_del_event(ngx_event_t *ev, int event, u_int flags)
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0
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191 {
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192 ngx_uint_t i;
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193 ngx_cycle_t **cycle;
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194 ngx_event_t *e;
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195 ngx_connection_t *c;
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196
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197 c = ev->data;
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198
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199 ev->active = 0;
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200
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201 if (ev->index == NGX_INVALID_INDEX) {
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202 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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203 "poll event fd:%d ev:%d is already deleted",
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204 c->fd, event);
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205 return NGX_OK;
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206 }
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207
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208 if (event == NGX_READ_EVENT) {
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209 e = c->write;
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210 #if (NGX_READ_EVENT != POLLIN)
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211 event = POLLIN;
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212 #endif
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213
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214 } else {
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215 e = c->read;
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216 #if (NGX_WRITE_EVENT != POLLOUT)
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217 event = POLLOUT;
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218 #endif
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219 }
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220
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221 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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222 "poll del event: fd:%d ev:%d", c->fd, event);
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223
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224 if (e == NULL || e->index == NGX_INVALID_INDEX) {
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225 nevents--;
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226
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227 if (ev->index < (u_int) nevents) {
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228
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229 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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230 "index: copy event %d to %d", nevents, ev->index);
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231
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232 event_list[ev->index] = event_list[nevents];
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233
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92
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234 c = ngx_cycle->files[event_list[nevents].fd];
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0
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235
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236 if (c->fd == -1) {
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237 cycle = ngx_old_cycles.elts;
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238 for (i = 0; i < ngx_old_cycles.nelts; i++) {
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239 if (cycle[i] == NULL) {
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240 continue;
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241 }
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92
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242 c = cycle[i]->files[event_list[nevents].fd];
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0
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243 if (c->fd != -1) {
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244 break;
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245 }
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246 }
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247 }
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248
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249 if (c->fd == -1) {
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250 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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251 "unexpected last event");
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252
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253 } else {
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254 if (c->read->index == (u_int) nevents) {
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255 c->read->index = ev->index;
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256 }
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257
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258 if (c->write->index == (u_int) nevents) {
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259 c->write->index = ev->index;
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260 }
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261 }
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262 }
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263
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264 } else {
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265 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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266 "poll del index: %d", e->index);
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267
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268 event_list[e->index].events &= ~event;
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269 }
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270
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271 ev->index = NGX_INVALID_INDEX;
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272
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273 return NGX_OK;
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274 }
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275
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276
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48
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277 static ngx_int_t
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278 ngx_poll_process_events(ngx_cycle_t *cycle)
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0
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279 {
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32
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280 int ready, revents;
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0
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281 ngx_int_t i, nready;
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282 ngx_uint_t n, found, lock, expire;
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283 ngx_msec_t timer;
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284 ngx_err_t err;
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285 ngx_cycle_t **old_cycle;
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286 ngx_event_t *ev;
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287 ngx_epoch_msec_t delta;
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288 ngx_connection_t *c;
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289 struct timeval tv;
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290
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291 for ( ;; ) {
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292 timer = ngx_event_find_timer();
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293
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294 if (timer != 0) {
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295 break;
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296 }
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297
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298 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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299 "poll expired timer");
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300
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301 ngx_event_expire_timers((ngx_msec_t)
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302 (ngx_elapsed_msec - ngx_old_elapsed_msec));
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303 }
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304
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305 /* NGX_TIMER_INFINITE == INFTIM */
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306
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307 if (timer == NGX_TIMER_INFINITE) {
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308 expire = 0;
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309
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310 } else {
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311 expire = 1;
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312 }
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313
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314 ngx_old_elapsed_msec = ngx_elapsed_msec;
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315
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316 #if (NGX_DEBUG0)
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317 if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
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318 for (i = 0; i < nevents; i++) {
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319 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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320 "poll: %d: fd:%d ev:%04Xd",
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0
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321 i, event_list[i].fd, event_list[i].events);
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322 }
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323 }
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324 #endif
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325
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326 if (ngx_accept_mutex) {
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327 if (ngx_accept_disabled > 0) {
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328 ngx_accept_disabled--;
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329
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330 } else {
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331 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
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332 return NGX_ERROR;
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333 }
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334
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335 if (ngx_accept_mutex_held == 0
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336 && (timer == NGX_TIMER_INFINITE
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337 || timer > ngx_accept_mutex_delay))
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338 {
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339 timer = ngx_accept_mutex_delay;
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340 expire = 0;
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341 }
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342 }
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343 }
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344
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345 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll timer: %d", timer);
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346
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347 ready = poll(event_list, (u_int) nevents, (int) timer);
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348
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349 if (ready == -1) {
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350 err = ngx_errno;
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351 } else {
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352 err = 0;
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353 }
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354
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355 ngx_gettimeofday(&tv);
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356 ngx_time_update(tv.tv_sec);
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357
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358 delta = ngx_elapsed_msec;
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359 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
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360 + tv.tv_usec / 1000 - ngx_start_msec;
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361
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362 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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363 "poll ready %d of %d", ready, nevents);
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364
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365 if (err) {
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366 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
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367 cycle->log, err, "poll() failed");
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368 ngx_accept_mutex_unlock();
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369 return NGX_ERROR;
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370 }
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371
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372 if (timer != NGX_TIMER_INFINITE) {
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373 delta = ngx_elapsed_msec - delta;
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374
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375 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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376 "poll timer: %d, delta: %d", timer, (int) delta);
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377 } else {
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378 if (ready == 0) {
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379 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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380 "poll() returned no events without timeout");
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381 ngx_accept_mutex_unlock();
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382 return NGX_ERROR;
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383 }
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384 }
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385
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386 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
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387 ngx_accept_mutex_unlock();
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388 return NGX_ERROR;
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389 }
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390
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391 lock = 1;
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392 nready = 0;
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393
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394 for (i = 0; i < nevents && ready; i++) {
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395
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32
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396 revents = event_list[i].revents;
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397
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0
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398 #if 0
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399 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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400 "poll: %d: fd:%d ev:%04Xd rev:%04Xd",
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32
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401 i, event_list[i].fd, event_list[i].events, revents);
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0
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402 #else
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32
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403 if (revents) {
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0
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404 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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405 "poll: %d: fd:%d ev:%04Xd rev:%04Xd",
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32
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406 i, event_list[i].fd, event_list[i].events, revents);
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0
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407 }
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408 #endif
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409
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32
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410 if (revents & POLLNVAL) {
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0
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411 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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10
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412 "poll() error fd:%d ev:%04Xd rev:%04Xd",
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32
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413 event_list[i].fd, event_list[i].events, revents);
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0
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414 }
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|
415
|
|
32
|
416 if (revents & ~(POLLIN|POLLOUT|POLLERR|POLLHUP|POLLNVAL)) {
|
|
0
|
417 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
10
|
418 "strange poll() events fd:%d ev:%04Xd rev:%04Xd",
|
|
32
|
419 event_list[i].fd, event_list[i].events, revents);
|
|
0
|
420 }
|
|
|
421
|
|
|
422 if (event_list[i].fd == -1) {
|
|
|
423 /*
|
|
|
424 * the disabled event, a workaround for our possible bug,
|
|
|
425 * see the comment below
|
|
|
426 */
|
|
|
427 continue;
|
|
|
428 }
|
|
|
429
|
|
92
|
430 c = ngx_cycle->files[event_list[i].fd];
|
|
0
|
431
|
|
|
432 if (c->fd == -1) {
|
|
|
433 old_cycle = ngx_old_cycles.elts;
|
|
|
434 for (n = 0; n < ngx_old_cycles.nelts; n++) {
|
|
|
435 if (old_cycle[n] == NULL) {
|
|
|
436 continue;
|
|
|
437 }
|
|
92
|
438 c = old_cycle[n]->files[event_list[i].fd];
|
|
0
|
439 if (c->fd != -1) {
|
|
|
440 break;
|
|
|
441 }
|
|
|
442 }
|
|
|
443 }
|
|
|
444
|
|
|
445 if (c->fd == -1) {
|
|
|
446 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "unexpected event");
|
|
|
447
|
|
|
448 /*
|
|
|
449 * it is certainly our fault and it should be investigated,
|
|
|
450 * in the meantime we disable this event to avoid a CPU spinning
|
|
|
451 */
|
|
|
452
|
|
|
453 if (i == nevents - 1) {
|
|
|
454 nevents--;
|
|
|
455 } else {
|
|
|
456 event_list[i].fd = -1;
|
|
|
457 }
|
|
|
458
|
|
|
459 continue;
|
|
|
460 }
|
|
|
461
|
|
32
|
462 if ((revents & (POLLERR|POLLHUP|POLLNVAL))
|
|
|
463 && (revents & (POLLIN|POLLOUT)) == 0)
|
|
|
464 {
|
|
|
465 /*
|
|
|
466 * if the error events were returned without POLLIN or POLLOUT,
|
|
|
467 * then add these flags to handle the events at least in one
|
|
|
468 * active handler
|
|
|
469 */
|
|
|
470
|
|
|
471 revents |= POLLIN|POLLOUT;
|
|
|
472 }
|
|
|
473
|
|
0
|
474 found = 0;
|
|
|
475
|
|
32
|
476 if (revents & POLLIN) {
|
|
0
|
477 found = 1;
|
|
|
478
|
|
|
479 ev = c->read;
|
|
|
480 ev->ready = 1;
|
|
|
481
|
|
|
482 if (ev->oneshot) {
|
|
|
483 if (ev->timer_set) {
|
|
|
484 ngx_del_timer(ev);
|
|
|
485 }
|
|
|
486 ngx_poll_del_event(ev, NGX_READ_EVENT, 0);
|
|
|
487 }
|
|
|
488
|
|
|
489 if (ev->accept) {
|
|
|
490 ev->next = accept_events;
|
|
|
491 accept_events = ev;
|
|
|
492 } else {
|
|
|
493 ngx_post_event(ev);
|
|
|
494 }
|
|
|
495
|
|
|
496 #if 0
|
|
|
497 ready_index[nready++] = c->read;
|
|
|
498 #endif
|
|
|
499 }
|
|
|
500
|
|
32
|
501 if (revents & POLLOUT) {
|
|
0
|
502 found = 1;
|
|
|
503 ev = c->write;
|
|
|
504 ev->ready = 1;
|
|
|
505
|
|
|
506 if (ev->oneshot) {
|
|
|
507 if (ev->timer_set) {
|
|
|
508 ngx_del_timer(ev);
|
|
|
509 }
|
|
|
510 ngx_poll_del_event(ev, NGX_WRITE_EVENT, 0);
|
|
|
511 }
|
|
|
512
|
|
|
513 ngx_post_event(ev);
|
|
|
514 #if 0
|
|
|
515 ready_index[nready++] = c->write;
|
|
|
516 #endif
|
|
|
517 }
|
|
|
518
|
|
|
519 if (found) {
|
|
|
520 ready--;
|
|
|
521 continue;
|
|
|
522 }
|
|
|
523 }
|
|
|
524
|
|
|
525 #if 0
|
|
|
526 for (i = 0; i < nready; i++) {
|
|
|
527 ev = ready_index[i];
|
|
|
528
|
|
|
529 if (!ev->active) {
|
|
|
530 continue;
|
|
|
531 }
|
|
|
532
|
|
|
533 ev->ready = 1;
|
|
|
534
|
|
|
535 if (ev->oneshot) {
|
|
|
536 if (ev->timer_set) {
|
|
|
537 ngx_del_timer(ev);
|
|
|
538 }
|
|
|
539
|
|
|
540 if (ev->write) {
|
|
|
541 ngx_poll_del_event(ev, NGX_WRITE_EVENT, 0);
|
|
|
542 } else {
|
|
|
543 ngx_poll_del_event(ev, NGX_READ_EVENT, 0);
|
|
|
544 }
|
|
|
545 }
|
|
|
546
|
|
58
|
547 ev->handler(ev);
|
|
0
|
548 }
|
|
|
549 #endif
|
|
|
550
|
|
|
551 ev = accept_events;
|
|
|
552
|
|
|
553 for ( ;; ) {
|
|
|
554
|
|
|
555 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
10
|
556 "accept event %p", ev);
|
|
0
|
557
|
|
|
558 if (ev == NULL) {
|
|
|
559 break;
|
|
|
560 }
|
|
|
561
|
|
|
562 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
563
|
|
58
|
564 ev->handler(ev);
|
|
0
|
565
|
|
|
566 if (ngx_accept_disabled > 0) {
|
|
|
567 lock = 0;
|
|
|
568 break;
|
|
|
569 }
|
|
|
570
|
|
|
571 ev = ev->next;
|
|
|
572
|
|
|
573 if (ev == NULL) {
|
|
|
574 lock = 0;
|
|
|
575 break;
|
|
|
576 }
|
|
|
577
|
|
|
578 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
579 ngx_accept_mutex_unlock();
|
|
|
580 return NGX_ERROR;
|
|
|
581 }
|
|
|
582
|
|
|
583 }
|
|
|
584
|
|
|
585 ngx_accept_mutex_unlock();
|
|
|
586 accept_events = NULL;
|
|
|
587
|
|
|
588 if (lock) {
|
|
|
589 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
590 }
|
|
|
591
|
|
|
592 if (ready != 0) {
|
|
|
593 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "poll ready != events");
|
|
|
594 }
|
|
|
595
|
|
|
596 if (expire && delta) {
|
|
|
597 ngx_event_expire_timers((ngx_msec_t) delta);
|
|
|
598 }
|
|
|
599
|
|
|
600 if (!ngx_threaded) {
|
|
|
601 ngx_event_process_posted(cycle);
|
|
|
602 }
|
|
|
603
|
|
|
604 return nready;
|
|
|
605 }
|
|
|
606
|
|
|
607
|
|
48
|
608 static char *
|
|
|
609 ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
0
|
610 {
|
|
|
611 ngx_event_conf_t *ecf;
|
|
|
612
|
|
|
613 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
|
|
|
614
|
|
|
615 if (ecf->use != ngx_poll_module.ctx_index) {
|
|
|
616 return NGX_CONF_OK;
|
|
|
617 }
|
|
|
618
|
|
|
619 #if (NGX_THREADS)
|
|
|
620
|
|
|
621 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
|
622 "poll() is not supported in the threaded mode");
|
|
|
623 return NGX_CONF_ERROR;
|
|
|
624
|
|
|
625 #else
|
|
|
626
|
|
|
627 return NGX_CONF_OK;
|
|
|
628
|
|
|
629 #endif
|
|
|
630 }
|
