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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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18
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12 #if (NGX_TEST_BUILD_EPOLL)
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0
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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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48
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73 static ngx_int_t ngx_epoll_init(ngx_cycle_t *cycle);
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0
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74 static void ngx_epoll_done(ngx_cycle_t *cycle);
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48
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75 static ngx_int_t ngx_epoll_add_event(ngx_event_t *ev, int event, u_int flags);
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76 static ngx_int_t ngx_epoll_del_event(ngx_event_t *ev, int event, u_int flags);
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77 static ngx_int_t ngx_epoll_add_connection(ngx_connection_t *c);
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78 static ngx_int_t ngx_epoll_del_connection(ngx_connection_t *c, u_int flags);
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79 static ngx_int_t ngx_epoll_process_events(ngx_cycle_t *cycle);
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0
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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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48
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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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0
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99
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48
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100 ngx_null_command
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0
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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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58
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124 NGX_MODULE_V1,
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0
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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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90
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128 NULL, /* init master */
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0
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129 NULL, /* init module */
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90
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130 NULL, /* init process */
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131 NULL, /* init thread */
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132 NULL, /* exit thread */
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133 NULL, /* exit process */
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134 NULL, /* exit master */
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135 NGX_MODULE_V1_PADDING
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0
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136 };
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137
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138
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48
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139 static ngx_int_t
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140 ngx_epoll_init(ngx_cycle_t *cycle)
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0
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141 {
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142 ngx_event_conf_t *ecf;
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143 ngx_epoll_conf_t *epcf;
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144
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145 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
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146
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147 epcf = ngx_event_get_conf(cycle->conf_ctx, ngx_epoll_module);
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148
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149 if (ep == -1) {
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150 ep = epoll_create(ecf->connections / 2);
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151
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152 if (ep == -1) {
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153 ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
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154 "epoll_create() failed");
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155 return NGX_ERROR;
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156 }
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157 }
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158
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159 if (nevents < epcf->events) {
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160 if (event_list) {
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161 ngx_free(event_list);
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162 }
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163
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164 event_list = ngx_alloc(sizeof(struct epoll_event) * epcf->events,
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165 cycle->log);
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166 if (event_list == NULL) {
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167 return NGX_ERROR;
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168 }
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169 }
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170
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171 nevents = epcf->events;
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172
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173 ngx_io = ngx_os_io;
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174
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175 ngx_event_actions = ngx_epoll_module_ctx.actions;
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176
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18
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177 #if (NGX_HAVE_CLEAR_EVENT)
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0
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178 ngx_event_flags = NGX_USE_CLEAR_EVENT
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179 #else
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180 ngx_event_flags = NGX_USE_LEVEL_EVENT
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181 #endif
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4
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182 |NGX_USE_GREEDY_EVENT
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0
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183 |NGX_USE_EPOLL_EVENT;
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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 void
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190 ngx_epoll_done(ngx_cycle_t *cycle)
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0
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191 {
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192 if (close(ep) == -1) {
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193 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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194 "epoll close() failed");
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195 }
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196
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197 ep = -1;
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198
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199 ngx_free(event_list);
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200
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201 event_list = NULL;
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202 nevents = 0;
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203 }
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204
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205
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48
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206 static ngx_int_t
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207 ngx_epoll_add_event(ngx_event_t *ev, int event, u_int flags)
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0
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208 {
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32
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209 int op;
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210 uint32_t events, prev;
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0
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211 ngx_event_t *e;
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212 ngx_connection_t *c;
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213 struct epoll_event ee;
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214
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215 c = ev->data;
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216
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32
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217 events = (uint32_t) event;
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218
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0
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219 if (event == NGX_READ_EVENT) {
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220 e = c->write;
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221 prev = EPOLLOUT;
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222 #if (NGX_READ_EVENT != EPOLLIN)
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32
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223 events = EPOLLIN;
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0
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224 #endif
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225
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226 } else {
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227 e = c->read;
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228 prev = EPOLLIN;
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229 #if (NGX_WRITE_EVENT != EPOLLOUT)
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32
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230 events = EPOLLOUT;
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0
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231 #endif
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232 }
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233
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234 if (e->active) {
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235 op = EPOLL_CTL_MOD;
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32
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236 events |= prev;
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0
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237
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238 } else {
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239 op = EPOLL_CTL_ADD;
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240 }
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241
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32
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242 ee.events = events | flags;
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30
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243 ee.data.u64 = (uintptr_t) c | ev->instance;
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0
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244
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245 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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246 "epoll add event: fd:%d op:%d ev:%08XD",
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0
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247 c->fd, op, ee.events);
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248
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249 if (epoll_ctl(ep, op, c->fd, &ee) == -1) {
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250 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
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251 "epoll_ctl(%d, %d) failed", op, c->fd);
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252 return NGX_ERROR;
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253 }
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254
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255 ev->active = 1;
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256 #if 0
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257 ev->oneshot = (flags & NGX_ONESHOT_EVENT) ? 1 : 0;
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258 #endif
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259
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260 return NGX_OK;
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261 }
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262
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263
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48
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264 static ngx_int_t
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265 ngx_epoll_del_event(ngx_event_t *ev, int event, u_int flags)
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0
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266 {
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32
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267 int op;
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268 uint32_t prev;
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0
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269 ngx_event_t *e;
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270 ngx_connection_t *c;
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271 struct epoll_event ee;
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272
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273 /*
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32
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274 * when the file descriptor is closed, the epoll automatically deletes
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275 * it from its queue, so we do not need to delete explicity the event
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0
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276 * before the closing the file descriptor
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277 */
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278
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279 if (flags & NGX_CLOSE_EVENT) {
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280 ev->active = 0;
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281 return NGX_OK;
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282 }
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283
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284 c = ev->data;
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285
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286 if (event == NGX_READ_EVENT) {
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287 e = c->write;
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288 prev = EPOLLOUT;
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289
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290 } else {
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291 e = c->read;
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292 prev = EPOLLIN;
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293 }
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294
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295 if (e->active) {
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296 op = EPOLL_CTL_MOD;
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297 ee.events = prev | flags;
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30
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298 ee.data.u64 = (uintptr_t) c | ev->instance;
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0
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299
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300 } else {
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301 op = EPOLL_CTL_DEL;
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302 ee.events = 0;
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303 ee.data.ptr = NULL;
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304 }
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305
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306 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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307 "epoll del event: fd:%d op:%d ev:%08XD",
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0
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308 c->fd, op, ee.events);
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309
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310 if (epoll_ctl(ep, op, c->fd, &ee) == -1) {
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311 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
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312 "epoll_ctl(%d, %d) failed", op, c->fd);
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313 return NGX_ERROR;
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314 }
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315
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316 ev->active = 0;
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317
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318 return NGX_OK;
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319 }
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320
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321
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48
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322 static ngx_int_t
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323 ngx_epoll_add_connection(ngx_connection_t *c)
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0
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324 {
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325 struct epoll_event ee;
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326
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327 ee.events = EPOLLIN|EPOLLOUT|EPOLLET;
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30
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328 ee.data.u64 = (uintptr_t) c | c->read->instance;
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0
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329
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330 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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10
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331 "epoll add connection: fd:%d ev:%08XD", c->fd, ee.events);
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0
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332
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333 if (epoll_ctl(ep, EPOLL_CTL_ADD, c->fd, &ee) == -1) {
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334 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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335 "epoll_ctl(EPOLL_CTL_ADD, %d) failed", c->fd);
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336 return NGX_ERROR;
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337 }
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338
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339 c->read->active = 1;
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340 c->write->active = 1;
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341
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342 return NGX_OK;
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343 }
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344
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345
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48
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346 static ngx_int_t
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347 ngx_epoll_del_connection(ngx_connection_t *c, u_int flags)
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0
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348 {
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349 int op;
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350 struct epoll_event ee;
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351
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352 /*
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353 * when the file descriptor is closed the epoll automatically deletes
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354 * it from its queue so we do not need to delete explicity the event
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355 * before the closing the file descriptor
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356 */
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357
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358 if (flags & NGX_CLOSE_EVENT) {
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359 c->read->active = 0;
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360 c->write->active = 0;
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361 return NGX_OK;
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362 }
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363
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364 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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365 "epoll del connection: fd:%d", c->fd);
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366
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367 op = EPOLL_CTL_DEL;
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368 ee.events = 0;
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30
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369 ee.data.u64 = 0;
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0
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370
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371 if (epoll_ctl(ep, op, c->fd, &ee) == -1) {
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372 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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373 "epoll_ctl(%d, %d) failed", op, c->fd);
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374 return NGX_ERROR;
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375 }
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376
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377 c->read->active = 0;
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378 c->write->active = 0;
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379
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380 return NGX_OK;
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381 }
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382
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383
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48
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384 static ngx_int_t
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385 ngx_epoll_process_events(ngx_cycle_t *cycle)
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0
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386 {
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387 int events;
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32
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388 uint32_t revents;
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0
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389 ngx_int_t instance, i;
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106
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390 ngx_uint_t lock, accept_lock;
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0
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391 ngx_err_t err;
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392 ngx_log_t *log;
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106
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393 ngx_msec_t timer, delta;
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0
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394 ngx_event_t *rev, *wev;
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395 struct timeval tv;
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396 ngx_connection_t *c;
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397
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106
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398 timer = ngx_event_find_timer();
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0
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399
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400 #if (NGX_THREADS)
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401
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106
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402 if (timer == NGX_TIMER_ERROR) {
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403 return NGX_ERROR;
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404 }
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0
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405
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106
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406 if (timer == NGX_TIMER_INFINITE || timer > 500) {
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407 timer = 500;
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408 break;
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409 }
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0
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410
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|
|
411 #endif
|
|
|
412
|
|
|
413 /* NGX_TIMER_INFINITE == INFTIM */
|
|
|
414
|
|
|
415 accept_lock = 0;
|
|
|
416
|
|
|
417 if (ngx_accept_mutex) {
|
|
|
418 if (ngx_accept_disabled > 0) {
|
|
|
419 ngx_accept_disabled--;
|
|
|
420
|
|
|
421 } else {
|
|
|
422 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
|
|
|
423 return NGX_ERROR;
|
|
|
424 }
|
|
|
425
|
|
|
426 if (ngx_accept_mutex_held) {
|
|
|
427 accept_lock = 1;
|
|
|
428
|
|
|
429 } else if (timer == NGX_TIMER_INFINITE
|
|
|
430 || timer > ngx_accept_mutex_delay)
|
|
|
431 {
|
|
|
432 timer = ngx_accept_mutex_delay;
|
|
|
433 }
|
|
|
434 }
|
|
|
435 }
|
|
|
436
|
|
|
437 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
106
|
438 "epoll timer: %M", timer);
|
|
0
|
439
|
|
|
440 events = epoll_wait(ep, event_list, nevents, timer);
|
|
|
441
|
|
|
442 if (events == -1) {
|
|
|
443 err = ngx_errno;
|
|
|
444 } else {
|
|
|
445 err = 0;
|
|
|
446 }
|
|
|
447
|
|
|
448 ngx_gettimeofday(&tv);
|
|
|
449 ngx_time_update(tv.tv_sec);
|
|
|
450
|
|
106
|
451 delta = ngx_current_time;
|
|
|
452 ngx_current_time = (ngx_msec_t) tv.tv_sec * 1000 + tv.tv_usec / 1000;
|
|
0
|
453
|
|
|
454 if (timer != NGX_TIMER_INFINITE) {
|
|
106
|
455 delta = ngx_current_time - delta;
|
|
0
|
456
|
|
|
457 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
106
|
458 "epoll timer: %M, delta: %M", timer, delta);
|
|
0
|
459 } else {
|
|
|
460 if (events == 0) {
|
|
|
461 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
462 "epoll_wait() returned no events without timeout");
|
|
|
463 ngx_accept_mutex_unlock();
|
|
|
464 return NGX_ERROR;
|
|
|
465 }
|
|
|
466 }
|
|
|
467
|
|
|
468 if (err) {
|
|
|
469 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
|
|
470 cycle->log, err, "epoll_wait() failed");
|
|
|
471 ngx_accept_mutex_unlock();
|
|
|
472 return NGX_ERROR;
|
|
|
473 }
|
|
|
474
|
|
|
475 if (events > 0) {
|
|
|
476 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
477 ngx_accept_mutex_unlock();
|
|
|
478 return NGX_ERROR;
|
|
|
479 }
|
|
|
480
|
|
|
481 lock = 1;
|
|
|
482
|
|
|
483 } else {
|
|
|
484 lock =0;
|
|
|
485 }
|
|
|
486
|
|
|
487 log = cycle->log;
|
|
|
488
|
|
|
489 for (i = 0; i < events; i++) {
|
|
|
490 c = event_list[i].data.ptr;
|
|
|
491
|
|
|
492 instance = (uintptr_t) c & 1;
|
|
|
493 c = (ngx_connection_t *) ((uintptr_t) c & (uintptr_t) ~1);
|
|
|
494
|
|
|
495 rev = c->read;
|
|
|
496
|
|
|
497 if (c->fd == -1 || rev->instance != instance) {
|
|
|
498
|
|
|
499 /*
|
|
|
500 * the stale event from a file descriptor
|
|
|
501 * that was just closed in this iteration
|
|
|
502 */
|
|
|
503
|
|
|
504 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
10
|
505 "epoll: stale event %p", c);
|
|
0
|
506 continue;
|
|
|
507 }
|
|
|
508
|
|
|
509 #if (NGX_DEBUG0)
|
|
|
510 log = c->log ? c->log : cycle->log;
|
|
|
511 #endif
|
|
|
512
|
|
32
|
513 revents = event_list[i].events;
|
|
|
514
|
|
0
|
515 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0,
|
|
10
|
516 "epoll: fd:%d ev:%04XD d:%p",
|
|
32
|
517 c->fd, revents, event_list[i].data);
|
|
0
|
518
|
|
32
|
519 if (revents & (EPOLLERR|EPOLLHUP)) {
|
|
0
|
520 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, log, 0,
|
|
10
|
521 "epoll_wait() error on fd:%d ev:%04XD",
|
|
32
|
522 c->fd, revents);
|
|
|
523 }
|
|
|
524
|
|
|
525 if (revents & ~(EPOLLIN|EPOLLOUT|EPOLLERR|EPOLLHUP)) {
|
|
|
526 ngx_log_error(NGX_LOG_ALERT, log, 0,
|
|
|
527 "strange epoll_wait() events fd:%d ev:%04XD",
|
|
|
528 c->fd, revents);
|
|
0
|
529 }
|
|
|
530
|
|
32
|
531 if ((revents & (EPOLLERR|EPOLLHUP))
|
|
|
532 && (revents & (EPOLLIN|EPOLLOUT)) == 0)
|
|
|
533 {
|
|
|
534 /*
|
|
|
535 * if the error events were returned without EPOLLIN or EPOLLOUT,
|
|
|
536 * then add these flags to handle the events at least in one
|
|
|
537 * active handler
|
|
|
538 */
|
|
|
539
|
|
|
540 revents |= EPOLLIN|EPOLLOUT;
|
|
0
|
541 }
|
|
|
542
|
|
|
543 wev = c->write;
|
|
|
544
|
|
32
|
545 if ((revents & EPOLLOUT) && wev->active) {
|
|
|
546
|
|
0
|
547 if (ngx_threaded) {
|
|
|
548 wev->posted_ready = 1;
|
|
|
549 ngx_post_event(wev);
|
|
|
550
|
|
|
551 } else {
|
|
|
552 wev->ready = 1;
|
|
|
553
|
|
|
554 if (!ngx_accept_mutex_held) {
|
|
58
|
555 wev->handler(wev);
|
|
0
|
556
|
|
|
557 } else {
|
|
|
558 ngx_post_event(wev);
|
|
|
559 }
|
|
|
560 }
|
|
|
561 }
|
|
|
562
|
|
|
563 /*
|
|
|
564 * EPOLLIN must be handled after EPOLLOUT because we use
|
|
|
565 * the optimization to avoid the unnecessary mutex locking/unlocking
|
|
|
566 * if the accept event is the last one.
|
|
|
567 */
|
|
|
568
|
|
32
|
569 if ((revents & EPOLLIN) && rev->active) {
|
|
|
570
|
|
0
|
571 if (ngx_threaded && !rev->accept) {
|
|
|
572 rev->posted_ready = 1;
|
|
|
573
|
|
|
574 ngx_post_event(rev);
|
|
|
575
|
|
|
576 continue;
|
|
|
577 }
|
|
|
578
|
|
|
579 rev->ready = 1;
|
|
|
580
|
|
|
581 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
58
|
582 rev->handler(rev);
|
|
0
|
583
|
|
|
584 } else if (!rev->accept) {
|
|
|
585 ngx_post_event(rev);
|
|
|
586
|
|
|
587 } else if (ngx_accept_disabled <= 0) {
|
|
|
588
|
|
|
589 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
590
|
|
58
|
591 rev->handler(rev);
|
|
0
|
592
|
|
|
593 if (ngx_accept_disabled > 0) {
|
|
|
594 ngx_accept_mutex_unlock();
|
|
|
595 accept_lock = 0;
|
|
|
596 }
|
|
|
597
|
|
|
598 if (i + 1 == events) {
|
|
|
599 lock = 0;
|
|
|
600 break;
|
|
|
601 }
|
|
|
602
|
|
|
603 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
604 if (accept_lock) {
|
|
|
605 ngx_accept_mutex_unlock();
|
|
|
606 }
|
|
|
607 return NGX_ERROR;
|
|
|
608 }
|
|
|
609 }
|
|
|
610 }
|
|
|
611 }
|
|
|
612
|
|
|
613 if (accept_lock) {
|
|
|
614 ngx_accept_mutex_unlock();
|
|
|
615 }
|
|
|
616
|
|
|
617 if (lock) {
|
|
|
618 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
619 }
|
|
|
620
|
|
106
|
621 ngx_event_expire_timers();
|
|
0
|
622
|
|
|
623 if (ngx_posted_events) {
|
|
|
624 if (ngx_threaded) {
|
|
|
625 ngx_wakeup_worker_thread(cycle);
|
|
|
626
|
|
|
627 } else {
|
|
|
628 ngx_event_process_posted(cycle);
|
|
|
629 }
|
|
|
630 }
|
|
|
631
|
|
|
632 return NGX_OK;
|
|
|
633 }
|
|
|
634
|
|
|
635
|
|
48
|
636 static void *
|
|
|
637 ngx_epoll_create_conf(ngx_cycle_t *cycle)
|
|
0
|
638 {
|
|
|
639 ngx_epoll_conf_t *epcf;
|
|
|
640
|
|
50
|
641 epcf = ngx_palloc(cycle->pool, sizeof(ngx_epoll_conf_t));
|
|
|
642 if (epcf == NULL) {
|
|
|
643 return NGX_CONF_ERROR;
|
|
|
644 }
|
|
0
|
645
|
|
|
646 epcf->events = NGX_CONF_UNSET;
|
|
|
647
|
|
|
648 return epcf;
|
|
|
649 }
|
|
|
650
|
|
|
651
|
|
48
|
652 static char *
|
|
|
653 ngx_epoll_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
0
|
654 {
|
|
|
655 ngx_epoll_conf_t *epcf = conf;
|
|
|
656
|
|
|
657 ngx_conf_init_unsigned_value(epcf->events, 512);
|
|
|
658
|
|
|
659 return NGX_CONF_OK;
|
|
|
660 }
|
