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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 #if (TEST_BUILD_EPOLL)
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13
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14 /* epoll declarations */
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15
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16 #define EPOLLIN 0x001
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17 #define EPOLLPRI 0x002
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18 #define EPOLLOUT 0x004
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19 #define EPOLLRDNORM 0x040
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20 #define EPOLLRDBAND 0x080
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21 #define EPOLLWRNORM 0x100
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22 #define EPOLLWRBAND 0x200
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23 #define EPOLLMSG 0x400
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24 #define EPOLLERR 0x008
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25 #define EPOLLHUP 0x010
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26
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27 #define EPOLLET 0x80000000
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28 #define EPOLLONESHOT 0x40000000
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29
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30 #define EPOLL_CTL_ADD 1
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31 #define EPOLL_CTL_DEL 2
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32 #define EPOLL_CTL_MOD 3
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33
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34 typedef union epoll_data {
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35 void *ptr;
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36 int fd;
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37 uint32_t u32;
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38 uint64_t u64;
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39 } epoll_data_t;
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40
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41 struct epoll_event {
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42 uint32_t events;
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43 epoll_data_t data;
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44 };
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45
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46 int epoll_create(int size);
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47 int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event);
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48 int epoll_wait(int epfd, struct epoll_event *events, int nevents, int timeout);
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49
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50 int epoll_create(int size)
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51 {
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52 return -1;
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53 }
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54
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55 int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event)
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56 {
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57 return -1;
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58 }
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59
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60 int epoll_wait(int epfd, struct epoll_event *events, int nevents, int timeout)
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61 {
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62 return -1;
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63 }
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64
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65 #endif
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66
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67
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68 typedef struct {
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69 u_int events;
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70 } ngx_epoll_conf_t;
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71
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72
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73 static int ngx_epoll_init(ngx_cycle_t *cycle);
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74 static void ngx_epoll_done(ngx_cycle_t *cycle);
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75 static int ngx_epoll_add_event(ngx_event_t *ev, int event, u_int flags);
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76 static int ngx_epoll_del_event(ngx_event_t *ev, int event, u_int flags);
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77 static int ngx_epoll_add_connection(ngx_connection_t *c);
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78 static int ngx_epoll_del_connection(ngx_connection_t *c, u_int flags);
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79 static int ngx_epoll_process_events(ngx_cycle_t *cycle);
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80
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81 static void *ngx_epoll_create_conf(ngx_cycle_t *cycle);
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82 static char *ngx_epoll_init_conf(ngx_cycle_t *cycle, void *conf);
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83
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84 static int ep = -1;
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85 static struct epoll_event *event_list;
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86 static u_int nevents;
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87
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88
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89 static ngx_str_t epoll_name = ngx_string("epoll");
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90
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91 static ngx_command_t ngx_epoll_commands[] = {
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92
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93 {ngx_string("epoll_events"),
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94 NGX_EVENT_CONF|NGX_CONF_TAKE1,
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95 ngx_conf_set_num_slot,
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96 0,
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97 offsetof(ngx_epoll_conf_t, events),
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98 NULL},
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99
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100 ngx_null_command
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101 };
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102
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103
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104 ngx_event_module_t ngx_epoll_module_ctx = {
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105 &epoll_name,
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106 ngx_epoll_create_conf, /* create configuration */
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107 ngx_epoll_init_conf, /* init configuration */
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108
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109 {
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110 ngx_epoll_add_event, /* add an event */
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111 ngx_epoll_del_event, /* delete an event */
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112 ngx_epoll_add_event, /* enable an event */
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113 ngx_epoll_del_event, /* disable an event */
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114 ngx_epoll_add_connection, /* add an connection */
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115 ngx_epoll_del_connection, /* delete an connection */
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116 NULL, /* process the changes */
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117 ngx_epoll_process_events, /* process the events */
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118 ngx_epoll_init, /* init the events */
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119 ngx_epoll_done, /* done the events */
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120 }
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121 };
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122
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123 ngx_module_t ngx_epoll_module = {
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124 NGX_MODULE,
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125 &ngx_epoll_module_ctx, /* module context */
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126 ngx_epoll_commands, /* module directives */
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127 NGX_EVENT_MODULE, /* module type */
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128 NULL, /* init module */
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129 NULL /* init process */
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130 };
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131
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132
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133 static int ngx_epoll_init(ngx_cycle_t *cycle)
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134 {
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135 size_t n;
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136 ngx_event_conf_t *ecf;
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137 ngx_epoll_conf_t *epcf;
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138
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139 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
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140
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141 epcf = ngx_event_get_conf(cycle->conf_ctx, ngx_epoll_module);
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142
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143 if (ep == -1) {
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144 ep = epoll_create(ecf->connections / 2);
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145
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146 if (ep == -1) {
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147 ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
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148 "epoll_create() failed");
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149 return NGX_ERROR;
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150 }
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151 }
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152
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153 if (nevents < epcf->events) {
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154 if (event_list) {
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155 ngx_free(event_list);
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156 }
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157
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158 event_list = ngx_alloc(sizeof(struct epoll_event) * epcf->events,
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159 cycle->log);
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160 if (event_list == NULL) {
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161 return NGX_ERROR;
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162 }
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163 }
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164
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165 nevents = epcf->events;
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166
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167 ngx_io = ngx_os_io;
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168
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169 ngx_event_actions = ngx_epoll_module_ctx.actions;
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170
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171 #if (HAVE_CLEAR_EVENT)
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172 ngx_event_flags = NGX_USE_CLEAR_EVENT
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173 #else
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174 ngx_event_flags = NGX_USE_LEVEL_EVENT
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175 #endif
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4
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176 |NGX_USE_GREEDY_EVENT
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0
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177 |NGX_USE_EPOLL_EVENT;
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178
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179 return NGX_OK;
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180 }
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181
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182
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183 static void ngx_epoll_done(ngx_cycle_t *cycle)
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184 {
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185 if (close(ep) == -1) {
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186 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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187 "epoll close() failed");
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188 }
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189
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190 ep = -1;
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191
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192 ngx_free(event_list);
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193
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194 event_list = NULL;
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195 nevents = 0;
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196 }
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197
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198
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199 static int ngx_epoll_add_event(ngx_event_t *ev, int event, u_int flags)
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200 {
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201 int op, prev;
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202 ngx_event_t *e;
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203 ngx_connection_t *c;
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204 struct epoll_event ee;
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205
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206 c = ev->data;
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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 prev = EPOLLOUT;
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211 #if (NGX_READ_EVENT != EPOLLIN)
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212 event = EPOLLIN;
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213 #endif
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214
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215 } else {
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216 e = c->read;
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217 prev = EPOLLIN;
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218 #if (NGX_WRITE_EVENT != EPOLLOUT)
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219 event = EPOLLOUT;
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220 #endif
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221 }
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222
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223 if (e->active) {
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224 op = EPOLL_CTL_MOD;
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225 event |= prev;
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226
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227 } else {
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228 op = EPOLL_CTL_ADD;
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229 }
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230
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231 ee.events = event | flags;
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232 ee.data.ptr = (void *) ((uintptr_t) c | ev->instance);
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233
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234 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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235 "epoll add event: fd:%d op:%d ev:%08X",
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236 c->fd, op, ee.events);
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237
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238 if (epoll_ctl(ep, op, c->fd, &ee) == -1) {
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239 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
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240 "epoll_ctl(%d, %d) failed", op, c->fd);
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241 return NGX_ERROR;
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242 }
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243
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244 ev->active = 1;
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245 #if 0
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246 ev->oneshot = (flags & NGX_ONESHOT_EVENT) ? 1 : 0;
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247 #endif
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248
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249 return NGX_OK;
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250 }
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251
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252
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253 static int ngx_epoll_del_event(ngx_event_t *ev, int event, u_int flags)
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254 {
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255 int op, prev;
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256 ngx_event_t *e;
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257 ngx_connection_t *c;
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258 struct epoll_event ee;
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259
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260 /*
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261 * when the file descriptor is closed the epoll automatically deletes
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262 * it from its queue so we do not need to delete explicity the event
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263 * before the closing the file descriptor
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264 */
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265
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266 if (flags & NGX_CLOSE_EVENT) {
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267 ev->active = 0;
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268 return NGX_OK;
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269 }
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270
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271 c = ev->data;
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272
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273 if (event == NGX_READ_EVENT) {
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274 e = c->write;
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275 prev = EPOLLOUT;
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276
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277 } else {
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278 e = c->read;
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279 prev = EPOLLIN;
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280 }
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281
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282 if (e->active) {
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283 op = EPOLL_CTL_MOD;
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284 ee.events = prev | flags;
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285 ee.data.ptr = (void *) ((uintptr_t) c | ev->instance);
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286
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287 } else {
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288 op = EPOLL_CTL_DEL;
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289 ee.events = 0;
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290 ee.data.ptr = NULL;
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291 }
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292
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293 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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294 "epoll del event: fd:%d op:%d ev:%08X",
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295 c->fd, op, ee.events);
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296
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297 if (epoll_ctl(ep, op, c->fd, &ee) == -1) {
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298 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
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299 "epoll_ctl(%d, %d) failed", op, c->fd);
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300 return NGX_ERROR;
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301 }
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302
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303 ev->active = 0;
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304
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305 return NGX_OK;
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306 }
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307
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308
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309 static int ngx_epoll_add_connection(ngx_connection_t *c)
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310 {
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311 struct epoll_event ee;
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312
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313 ee.events = EPOLLIN|EPOLLOUT|EPOLLET;
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314 ee.data.ptr = (void *) ((uintptr_t) c | c->read->instance);
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315
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316 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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317 "epoll add connection: fd:%d ev:%08X", c->fd, ee.events);
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318
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319 if (epoll_ctl(ep, EPOLL_CTL_ADD, c->fd, &ee) == -1) {
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320 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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321 "epoll_ctl(EPOLL_CTL_ADD, %d) failed", c->fd);
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322 return NGX_ERROR;
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323 }
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324
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325 c->read->active = 1;
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326 c->write->active = 1;
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327
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328 return NGX_OK;
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329 }
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330
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331
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332 static int ngx_epoll_del_connection(ngx_connection_t *c, u_int flags)
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333 {
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334 int op;
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335 struct epoll_event ee;
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336
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337 /*
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338 * when the file descriptor is closed the epoll automatically deletes
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339 * it from its queue so we do not need to delete explicity the event
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340 * before the closing the file descriptor
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341 */
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342
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343 if (flags & NGX_CLOSE_EVENT) {
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344 c->read->active = 0;
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345 c->write->active = 0;
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346 return NGX_OK;
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347 }
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348
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349 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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350 "epoll del connection: fd:%d", c->fd);
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351
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352 op = EPOLL_CTL_DEL;
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353 ee.events = 0;
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354 ee.data.ptr = NULL;
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355
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356 if (epoll_ctl(ep, op, c->fd, &ee) == -1) {
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357 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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358 "epoll_ctl(%d, %d) failed", op, c->fd);
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359 return NGX_ERROR;
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360 }
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361
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362 c->read->active = 0;
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363 c->write->active = 0;
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364
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365 return NGX_OK;
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366 }
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367
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368
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369 int ngx_epoll_process_events(ngx_cycle_t *cycle)
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370 {
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371 int events;
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372 size_t n;
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373 ngx_int_t instance, i;
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374 ngx_uint_t lock, accept_lock, expire;
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375 ngx_err_t err;
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376 ngx_log_t *log;
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377 ngx_msec_t timer;
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378 ngx_event_t *rev, *wev;
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379 struct timeval tv;
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380 ngx_connection_t *c;
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381 ngx_epoch_msec_t delta;
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382
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383 for ( ;; ) {
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384 timer = ngx_event_find_timer();
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385
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386 #if (NGX_THREADS)
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387
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388 if (timer == NGX_TIMER_ERROR) {
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389 return NGX_ERROR;
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390 }
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391
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392 if (timer == NGX_TIMER_INFINITE || timer > 500) {
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393 timer = 500;
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394 break;
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395 }
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396
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397 #endif
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398
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399 if (timer != 0) {
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400 break;
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401 }
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402
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403 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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404 "epoll expired timer");
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405
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406 ngx_event_expire_timers((ngx_msec_t)
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407 (ngx_elapsed_msec - ngx_old_elapsed_msec));
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408
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409 if (ngx_posted_events && ngx_threaded) {
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410 ngx_wakeup_worker_thread(cycle);
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411 }
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412 }
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413
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414 /* NGX_TIMER_INFINITE == INFTIM */
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415
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416 if (timer == NGX_TIMER_INFINITE) {
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417 expire = 0;
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418
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419 } else {
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420 expire = 1;
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421 }
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422
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423 ngx_old_elapsed_msec = ngx_elapsed_msec;
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|
|
424 accept_lock = 0;
|
|
|
425
|
|
|
426 if (ngx_accept_mutex) {
|
|
|
427 if (ngx_accept_disabled > 0) {
|
|
|
428 ngx_accept_disabled--;
|
|
|
429
|
|
|
430 } else {
|
|
|
431 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
|
|
|
432 return NGX_ERROR;
|
|
|
433 }
|
|
|
434
|
|
|
435 if (ngx_accept_mutex_held) {
|
|
|
436 accept_lock = 1;
|
|
|
437
|
|
|
438 } else if (timer == NGX_TIMER_INFINITE
|
|
|
439 || timer > ngx_accept_mutex_delay)
|
|
|
440 {
|
|
|
441 timer = ngx_accept_mutex_delay;
|
|
|
442 expire = 0;
|
|
|
443 }
|
|
|
444 }
|
|
|
445 }
|
|
|
446
|
|
|
447 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
448 "epoll timer: %d", timer);
|
|
|
449
|
|
|
450 events = epoll_wait(ep, event_list, nevents, timer);
|
|
|
451
|
|
|
452 if (events == -1) {
|
|
|
453 err = ngx_errno;
|
|
|
454 } else {
|
|
|
455 err = 0;
|
|
|
456 }
|
|
|
457
|
|
|
458 ngx_gettimeofday(&tv);
|
|
|
459 ngx_time_update(tv.tv_sec);
|
|
|
460
|
|
|
461 delta = ngx_elapsed_msec;
|
|
|
462 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
|
|
|
463 + tv.tv_usec / 1000 - ngx_start_msec;
|
|
|
464
|
|
|
465 if (timer != NGX_TIMER_INFINITE) {
|
|
|
466 delta = ngx_elapsed_msec - delta;
|
|
|
467
|
|
|
468 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
469 "epoll timer: %d, delta: %d", timer, (int) delta);
|
|
|
470 } else {
|
|
|
471 if (events == 0) {
|
|
|
472 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
473 "epoll_wait() returned no events without timeout");
|
|
|
474 ngx_accept_mutex_unlock();
|
|
|
475 return NGX_ERROR;
|
|
|
476 }
|
|
|
477 }
|
|
|
478
|
|
|
479 if (err) {
|
|
|
480 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
|
|
481 cycle->log, err, "epoll_wait() failed");
|
|
|
482 ngx_accept_mutex_unlock();
|
|
|
483 return NGX_ERROR;
|
|
|
484 }
|
|
|
485
|
|
|
486 if (events > 0) {
|
|
|
487 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
488 ngx_accept_mutex_unlock();
|
|
|
489 return NGX_ERROR;
|
|
|
490 }
|
|
|
491
|
|
|
492 lock = 1;
|
|
|
493
|
|
|
494 } else {
|
|
|
495 lock =0;
|
|
|
496 }
|
|
|
497
|
|
|
498 log = cycle->log;
|
|
|
499
|
|
|
500 for (i = 0; i < events; i++) {
|
|
|
501 c = event_list[i].data.ptr;
|
|
|
502
|
|
|
503 instance = (uintptr_t) c & 1;
|
|
|
504 c = (ngx_connection_t *) ((uintptr_t) c & (uintptr_t) ~1);
|
|
|
505
|
|
|
506 rev = c->read;
|
|
|
507
|
|
|
508 if (c->fd == -1 || rev->instance != instance) {
|
|
|
509
|
|
|
510 /*
|
|
|
511 * the stale event from a file descriptor
|
|
|
512 * that was just closed in this iteration
|
|
|
513 */
|
|
|
514
|
|
|
515 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
516 "epoll: stale event " PTR_FMT, c);
|
|
|
517 continue;
|
|
|
518 }
|
|
|
519
|
|
|
520 #if (NGX_DEBUG0)
|
|
|
521 log = c->log ? c->log : cycle->log;
|
|
|
522 #endif
|
|
|
523
|
|
|
524 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0,
|
|
|
525 "epoll: fd:%d ev:%04X d:" PTR_FMT,
|
|
|
526 c->fd, event_list[i].events, event_list[i].data);
|
|
|
527
|
|
|
528 if (event_list[i].events & (EPOLLERR|EPOLLHUP)) {
|
|
|
529 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, log, 0,
|
|
|
530 "epoll_wait() error on fd:%d ev:%04X",
|
|
|
531 c->fd, event_list[i].events);
|
|
|
532 }
|
|
|
533
|
|
|
534 if (event_list[i].events & ~(EPOLLIN|EPOLLOUT|EPOLLERR|EPOLLHUP)) {
|
|
|
535 ngx_log_error(NGX_LOG_ALERT, log, 0,
|
|
|
536 "strange epoll_wait() events fd:%d ev:%04X",
|
|
|
537 c->fd, event_list[i].events);
|
|
|
538 }
|
|
|
539
|
|
|
540 wev = c->write;
|
|
|
541
|
|
|
542 if ((event_list[i].events & (EPOLLOUT|EPOLLERR|EPOLLHUP))
|
|
|
543 && wev->active)
|
|
|
544 {
|
|
|
545 if (ngx_threaded) {
|
|
|
546 wev->posted_ready = 1;
|
|
|
547 ngx_post_event(wev);
|
|
|
548
|
|
|
549 } else {
|
|
|
550 wev->ready = 1;
|
|
|
551
|
|
|
552 if (!ngx_accept_mutex_held) {
|
|
|
553 wev->event_handler(wev);
|
|
|
554
|
|
|
555 } else {
|
|
|
556 ngx_post_event(wev);
|
|
|
557 }
|
|
|
558 }
|
|
|
559 }
|
|
|
560
|
|
|
561 /*
|
|
|
562 * EPOLLIN must be handled after EPOLLOUT because we use
|
|
|
563 * the optimization to avoid the unnecessary mutex locking/unlocking
|
|
|
564 * if the accept event is the last one.
|
|
|
565 */
|
|
|
566
|
|
|
567 if ((event_list[i].events & (EPOLLIN|EPOLLERR|EPOLLHUP))
|
|
|
568 && rev->active)
|
|
|
569 {
|
|
|
570 if (ngx_threaded && !rev->accept) {
|
|
|
571 rev->posted_ready = 1;
|
|
|
572
|
|
|
573 ngx_post_event(rev);
|
|
|
574
|
|
|
575 continue;
|
|
|
576 }
|
|
|
577
|
|
|
578 rev->ready = 1;
|
|
|
579
|
|
|
580 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
|
581 rev->event_handler(rev);
|
|
|
582
|
|
|
583 } else if (!rev->accept) {
|
|
|
584 ngx_post_event(rev);
|
|
|
585
|
|
|
586 } else if (ngx_accept_disabled <= 0) {
|
|
|
587
|
|
|
588 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
589
|
|
|
590 rev->event_handler(rev);
|
|
|
591
|
|
|
592 if (ngx_accept_disabled > 0) {
|
|
|
593 ngx_accept_mutex_unlock();
|
|
|
594 accept_lock = 0;
|
|
|
595 }
|
|
|
596
|
|
|
597 if (i + 1 == events) {
|
|
|
598 lock = 0;
|
|
|
599 break;
|
|
|
600 }
|
|
|
601
|
|
|
602 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
603 if (accept_lock) {
|
|
|
604 ngx_accept_mutex_unlock();
|
|
|
605 }
|
|
|
606 return NGX_ERROR;
|
|
|
607 }
|
|
|
608 }
|
|
|
609 }
|
|
|
610 }
|
|
|
611
|
|
|
612 if (accept_lock) {
|
|
|
613 ngx_accept_mutex_unlock();
|
|
|
614 }
|
|
|
615
|
|
|
616 if (lock) {
|
|
|
617 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
618 }
|
|
|
619
|
|
|
620 if (expire && delta) {
|
|
|
621 ngx_event_expire_timers((ngx_msec_t) delta);
|
|
|
622 }
|
|
|
623
|
|
|
624 if (ngx_posted_events) {
|
|
|
625 if (ngx_threaded) {
|
|
|
626 ngx_wakeup_worker_thread(cycle);
|
|
|
627
|
|
|
628 } else {
|
|
|
629 ngx_event_process_posted(cycle);
|
|
|
630 }
|
|
|
631 }
|
|
|
632
|
|
|
633 return NGX_OK;
|
|
|
634 }
|
|
|
635
|
|
|
636
|
|
|
637 static void *ngx_epoll_create_conf(ngx_cycle_t *cycle)
|
|
|
638 {
|
|
|
639 ngx_epoll_conf_t *epcf;
|
|
|
640
|
|
|
641 ngx_test_null(epcf, ngx_palloc(cycle->pool, sizeof(ngx_epoll_conf_t)),
|
|
|
642 NGX_CONF_ERROR);
|
|
|
643
|
|
|
644 epcf->events = NGX_CONF_UNSET;
|
|
|
645
|
|
|
646 return epcf;
|
|
|
647 }
|
|
|
648
|
|
|
649
|
|
|
650 static char *ngx_epoll_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
|
651 {
|
|
|
652 ngx_epoll_conf_t *epcf = conf;
|
|
|
653
|
|
|
654 ngx_conf_init_unsigned_value(epcf->events, 512);
|
|
|
655
|
|
|
656 return NGX_CONF_OK;
|
|
|
657 }
|
