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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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324
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69 ngx_uint_t events;
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0
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70 } ngx_epoll_conf_t;
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71
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72
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112
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73 static ngx_int_t ngx_epoll_init(ngx_cycle_t *cycle, ngx_msec_t timer);
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0
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74 static void ngx_epoll_done(ngx_cycle_t *cycle);
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324
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75 static ngx_int_t ngx_epoll_add_event(ngx_event_t *ev, ngx_int_t event,
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76 ngx_uint_t flags);
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77 static ngx_int_t ngx_epoll_del_event(ngx_event_t *ev, ngx_int_t event,
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78 ngx_uint_t flags);
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48
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79 static ngx_int_t ngx_epoll_add_connection(ngx_connection_t *c);
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324
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80 static ngx_int_t ngx_epoll_del_connection(ngx_connection_t *c,
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81 ngx_uint_t flags);
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112
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82 static ngx_int_t ngx_epoll_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
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83 ngx_uint_t flags);
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0
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84
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85 static void *ngx_epoll_create_conf(ngx_cycle_t *cycle);
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86 static char *ngx_epoll_init_conf(ngx_cycle_t *cycle, void *conf);
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87
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88 static int ep = -1;
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89 static struct epoll_event *event_list;
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324
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90 static ngx_uint_t nevents;
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0
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91
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92
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93 static ngx_str_t epoll_name = ngx_string("epoll");
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94
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95 static ngx_command_t ngx_epoll_commands[] = {
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96
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48
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97 { ngx_string("epoll_events"),
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98 NGX_EVENT_CONF|NGX_CONF_TAKE1,
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99 ngx_conf_set_num_slot,
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100 0,
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101 offsetof(ngx_epoll_conf_t, events),
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102 NULL },
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0
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103
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48
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104 ngx_null_command
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0
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105 };
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106
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107
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108 ngx_event_module_t ngx_epoll_module_ctx = {
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109 &epoll_name,
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110 ngx_epoll_create_conf, /* create configuration */
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111 ngx_epoll_init_conf, /* init configuration */
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112
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113 {
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114 ngx_epoll_add_event, /* add an event */
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115 ngx_epoll_del_event, /* delete an event */
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116 ngx_epoll_add_event, /* enable an event */
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117 ngx_epoll_del_event, /* disable an event */
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118 ngx_epoll_add_connection, /* add an connection */
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119 ngx_epoll_del_connection, /* delete an connection */
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120 NULL, /* process the changes */
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121 ngx_epoll_process_events, /* process the events */
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122 ngx_epoll_init, /* init the events */
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123 ngx_epoll_done, /* done the events */
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124 }
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125 };
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126
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127 ngx_module_t ngx_epoll_module = {
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58
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128 NGX_MODULE_V1,
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0
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129 &ngx_epoll_module_ctx, /* module context */
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130 ngx_epoll_commands, /* module directives */
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131 NGX_EVENT_MODULE, /* module type */
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90
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132 NULL, /* init master */
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0
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133 NULL, /* init module */
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90
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134 NULL, /* init process */
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135 NULL, /* init thread */
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136 NULL, /* exit thread */
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137 NULL, /* exit process */
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138 NULL, /* exit master */
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139 NGX_MODULE_V1_PADDING
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0
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140 };
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141
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142
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48
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143 static ngx_int_t
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112
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144 ngx_epoll_init(ngx_cycle_t *cycle, ngx_msec_t timer)
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0
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145 {
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146 ngx_epoll_conf_t *epcf;
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147
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148 epcf = ngx_event_get_conf(cycle->conf_ctx, ngx_epoll_module);
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149
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150 if (ep == -1) {
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384
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151 ep = epoll_create(cycle->connection_n / 2);
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0
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152
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153 if (ep == -1) {
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154 ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
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155 "epoll_create() failed");
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156 return NGX_ERROR;
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157 }
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158 }
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159
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160 if (nevents < epcf->events) {
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161 if (event_list) {
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162 ngx_free(event_list);
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163 }
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164
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165 event_list = ngx_alloc(sizeof(struct epoll_event) * epcf->events,
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166 cycle->log);
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167 if (event_list == NULL) {
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168 return NGX_ERROR;
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169 }
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170 }
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171
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172 nevents = epcf->events;
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173
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174 ngx_io = ngx_os_io;
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175
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176 ngx_event_actions = ngx_epoll_module_ctx.actions;
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177
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18
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178 #if (NGX_HAVE_CLEAR_EVENT)
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0
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179 ngx_event_flags = NGX_USE_CLEAR_EVENT
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180 #else
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181 ngx_event_flags = NGX_USE_LEVEL_EVENT
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182 #endif
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4
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183 |NGX_USE_GREEDY_EVENT
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0
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184 |NGX_USE_EPOLL_EVENT;
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185
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186 return NGX_OK;
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187 }
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188
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189
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48
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190 static void
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191 ngx_epoll_done(ngx_cycle_t *cycle)
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0
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192 {
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193 if (close(ep) == -1) {
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194 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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195 "epoll close() failed");
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196 }
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197
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198 ep = -1;
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199
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200 ngx_free(event_list);
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201
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202 event_list = NULL;
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203 nevents = 0;
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204 }
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205
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206
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48
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207 static ngx_int_t
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324
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208 ngx_epoll_add_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
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0
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209 {
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32
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210 int op;
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211 uint32_t events, prev;
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0
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212 ngx_event_t *e;
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213 ngx_connection_t *c;
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214 struct epoll_event ee;
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215
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216 c = ev->data;
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217
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32
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218 events = (uint32_t) event;
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219
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0
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220 if (event == NGX_READ_EVENT) {
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221 e = c->write;
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222 prev = EPOLLOUT;
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223 #if (NGX_READ_EVENT != EPOLLIN)
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32
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224 events = EPOLLIN;
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0
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225 #endif
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226
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227 } else {
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228 e = c->read;
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229 prev = EPOLLIN;
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230 #if (NGX_WRITE_EVENT != EPOLLOUT)
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32
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231 events = EPOLLOUT;
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0
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232 #endif
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233 }
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234
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235 if (e->active) {
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236 op = EPOLL_CTL_MOD;
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32
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237 events |= prev;
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0
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238
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239 } else {
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240 op = EPOLL_CTL_ADD;
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241 }
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242
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324
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243 ee.events = events | (uint32_t) flags;
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130
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244 ee.data.ptr = (void *) ((uintptr_t) c | ev->instance);
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0
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245
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246 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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247 "epoll add event: fd:%d op:%d ev:%08XD",
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0
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248 c->fd, op, ee.events);
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249
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250 if (epoll_ctl(ep, op, c->fd, &ee) == -1) {
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251 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
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252 "epoll_ctl(%d, %d) failed", op, c->fd);
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253 return NGX_ERROR;
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254 }
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255
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256 ev->active = 1;
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257 #if 0
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258 ev->oneshot = (flags & NGX_ONESHOT_EVENT) ? 1 : 0;
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259 #endif
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260
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261 return NGX_OK;
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262 }
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263
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264
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48
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265 static ngx_int_t
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324
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266 ngx_epoll_del_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
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0
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267 {
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32
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268 int op;
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269 uint32_t prev;
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0
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270 ngx_event_t *e;
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271 ngx_connection_t *c;
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272 struct epoll_event ee;
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273
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274 /*
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32
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275 * when the file descriptor is closed, the epoll automatically deletes
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276 * it from its queue, so we do not need to delete explicity the event
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0
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277 * before the closing the file descriptor
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278 */
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279
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280 if (flags & NGX_CLOSE_EVENT) {
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281 ev->active = 0;
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282 return NGX_OK;
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283 }
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284
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285 c = ev->data;
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286
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287 if (event == NGX_READ_EVENT) {
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288 e = c->write;
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289 prev = EPOLLOUT;
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290
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291 } else {
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292 e = c->read;
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293 prev = EPOLLIN;
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294 }
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295
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296 if (e->active) {
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297 op = EPOLL_CTL_MOD;
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324
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298 ee.events = prev | (uint32_t) flags;
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130
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299 ee.data.ptr = (void *) ((uintptr_t) c | ev->instance);
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0
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300
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301 } else {
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302 op = EPOLL_CTL_DEL;
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303 ee.events = 0;
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304 ee.data.ptr = NULL;
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305 }
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306
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307 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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308 "epoll del event: fd:%d op:%d ev:%08XD",
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309 c->fd, op, ee.events);
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310
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311 if (epoll_ctl(ep, op, c->fd, &ee) == -1) {
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312 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
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313 "epoll_ctl(%d, %d) failed", op, c->fd);
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314 return NGX_ERROR;
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315 }
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316
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317 ev->active = 0;
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318
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319 return NGX_OK;
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320 }
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321
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322
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48
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323 static ngx_int_t
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324 ngx_epoll_add_connection(ngx_connection_t *c)
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0
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325 {
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326 struct epoll_event ee;
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327
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328 ee.events = EPOLLIN|EPOLLOUT|EPOLLET;
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130
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329 ee.data.ptr = (void *) ((uintptr_t) c | c->read->instance);
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0
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330
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331 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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10
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332 "epoll add connection: fd:%d ev:%08XD", c->fd, ee.events);
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0
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333
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334 if (epoll_ctl(ep, EPOLL_CTL_ADD, c->fd, &ee) == -1) {
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335 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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336 "epoll_ctl(EPOLL_CTL_ADD, %d) failed", c->fd);
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337 return NGX_ERROR;
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338 }
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339
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340 c->read->active = 1;
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341 c->write->active = 1;
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342
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343 return NGX_OK;
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344 }
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345
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346
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48
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347 static ngx_int_t
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324
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348 ngx_epoll_del_connection(ngx_connection_t *c, ngx_uint_t flags)
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0
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349 {
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324
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350 int op;
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351 struct epoll_event ee;
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0
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352
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353 /*
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354 * when the file descriptor is closed the epoll automatically deletes
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355 * it from its queue so we do not need to delete explicity the event
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356 * before the closing the file descriptor
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357 */
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358
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359 if (flags & NGX_CLOSE_EVENT) {
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360 c->read->active = 0;
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361 c->write->active = 0;
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362 return NGX_OK;
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363 }
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364
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365 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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366 "epoll del connection: fd:%d", c->fd);
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367
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368 op = EPOLL_CTL_DEL;
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369 ee.events = 0;
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130
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370 ee.data.ptr = NULL;
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0
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371
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372 if (epoll_ctl(ep, op, c->fd, &ee) == -1) {
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373 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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374 "epoll_ctl(%d, %d) failed", op, c->fd);
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375 return NGX_ERROR;
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376 }
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377
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378 c->read->active = 0;
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379 c->write->active = 0;
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380
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381 return NGX_OK;
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382 }
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383
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384
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48
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385 static ngx_int_t
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112
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386 ngx_epoll_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, ngx_uint_t flags)
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0
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387 {
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388 int events;
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32
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389 uint32_t revents;
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0
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390 ngx_int_t instance, i;
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112
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391 ngx_uint_t level;
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0
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392 ngx_err_t err;
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393 ngx_log_t *log;
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112
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394 ngx_event_t *rev, *wev, **queue;
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0
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395 ngx_connection_t *c;
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396
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397 /* NGX_TIMER_INFINITE == INFTIM */
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398
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399 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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106
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400 "epoll timer: %M", timer);
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0
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401
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324
|
402 events = epoll_wait(ep, event_list, (int) nevents, timer);
|
|
0
|
403
|
|
|
404 if (events == -1) {
|
|
|
405 err = ngx_errno;
|
|
|
406 } else {
|
|
|
407 err = 0;
|
|
|
408 }
|
|
|
409
|
|
112
|
410 if (flags & NGX_UPDATE_TIME) {
|
|
|
411 ngx_time_update(0, 0);
|
|
|
412 }
|
|
0
|
413
|
|
|
414 if (err) {
|
|
112
|
415 if (err == NGX_EINTR) {
|
|
|
416
|
|
|
417 if (ngx_event_timer_alarm) {
|
|
|
418 ngx_event_timer_alarm = 0;
|
|
|
419 return NGX_OK;
|
|
|
420 }
|
|
126
|
421
|
|
112
|
422 level = NGX_LOG_INFO;
|
|
126
|
423
|
|
|
424 } else {
|
|
112
|
425 level = NGX_LOG_ALERT;
|
|
|
426 }
|
|
|
427
|
|
|
428 ngx_log_error(level, cycle->log, err, "epoll_wait() failed");
|
|
0
|
429 return NGX_ERROR;
|
|
|
430 }
|
|
|
431
|
|
112
|
432 if (events == 0) {
|
|
116
|
433 if (timer != NGX_TIMER_INFINITE) {
|
|
|
434 return NGX_OK;
|
|
|
435 }
|
|
|
436
|
|
|
437 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
438 "epoll_wait() returned no events without timeout");
|
|
|
439 return NGX_ERROR;
|
|
112
|
440 }
|
|
0
|
441
|
|
112
|
442 ngx_mutex_lock(ngx_posted_events_mutex);
|
|
0
|
443
|
|
|
444 log = cycle->log;
|
|
|
445
|
|
|
446 for (i = 0; i < events; i++) {
|
|
|
447 c = event_list[i].data.ptr;
|
|
|
448
|
|
|
449 instance = (uintptr_t) c & 1;
|
|
|
450 c = (ngx_connection_t *) ((uintptr_t) c & (uintptr_t) ~1);
|
|
|
451
|
|
|
452 rev = c->read;
|
|
|
453
|
|
|
454 if (c->fd == -1 || rev->instance != instance) {
|
|
|
455
|
|
|
456 /*
|
|
|
457 * the stale event from a file descriptor
|
|
|
458 * that was just closed in this iteration
|
|
|
459 */
|
|
|
460
|
|
|
461 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
10
|
462 "epoll: stale event %p", c);
|
|
0
|
463 continue;
|
|
|
464 }
|
|
|
465
|
|
|
466 #if (NGX_DEBUG0)
|
|
|
467 log = c->log ? c->log : cycle->log;
|
|
|
468 #endif
|
|
|
469
|
|
32
|
470 revents = event_list[i].events;
|
|
|
471
|
|
0
|
472 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0,
|
|
10
|
473 "epoll: fd:%d ev:%04XD d:%p",
|
|
126
|
474 c->fd, revents, event_list[i].data.ptr);
|
|
0
|
475
|
|
32
|
476 if (revents & (EPOLLERR|EPOLLHUP)) {
|
|
0
|
477 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, log, 0,
|
|
10
|
478 "epoll_wait() error on fd:%d ev:%04XD",
|
|
32
|
479 c->fd, revents);
|
|
|
480 }
|
|
|
481
|
|
212
|
482 #if 0
|
|
32
|
483 if (revents & ~(EPOLLIN|EPOLLOUT|EPOLLERR|EPOLLHUP)) {
|
|
|
484 ngx_log_error(NGX_LOG_ALERT, log, 0,
|
|
|
485 "strange epoll_wait() events fd:%d ev:%04XD",
|
|
|
486 c->fd, revents);
|
|
0
|
487 }
|
|
212
|
488 #endif
|
|
0
|
489
|
|
32
|
490 if ((revents & (EPOLLERR|EPOLLHUP))
|
|
|
491 && (revents & (EPOLLIN|EPOLLOUT)) == 0)
|
|
|
492 {
|
|
|
493 /*
|
|
|
494 * if the error events were returned without EPOLLIN or EPOLLOUT,
|
|
|
495 * then add these flags to handle the events at least in one
|
|
|
496 * active handler
|
|
|
497 */
|
|
|
498
|
|
|
499 revents |= EPOLLIN|EPOLLOUT;
|
|
0
|
500 }
|
|
|
501
|
|
112
|
502 if ((revents & EPOLLIN) && rev->active) {
|
|
|
503
|
|
|
504 if ((flags & NGX_POST_THREAD_EVENTS) && !rev->accept) {
|
|
|
505 rev->posted_ready = 1;
|
|
|
506
|
|
|
507 } else {
|
|
|
508 rev->ready = 1;
|
|
|
509 }
|
|
|
510
|
|
|
511 if (flags & NGX_POST_EVENTS) {
|
|
|
512 queue = (ngx_event_t **) (rev->accept ?
|
|
|
513 &ngx_posted_accept_events : &ngx_posted_events);
|
|
|
514
|
|
|
515 ngx_locked_post_event(rev, queue);
|
|
|
516
|
|
|
517 } else {
|
|
|
518 rev->handler(rev);
|
|
|
519 }
|
|
|
520 }
|
|
|
521
|
|
0
|
522 wev = c->write;
|
|
|
523
|
|
32
|
524 if ((revents & EPOLLOUT) && wev->active) {
|
|
|
525
|
|
112
|
526 if (flags & NGX_POST_THREAD_EVENTS) {
|
|
0
|
527 wev->posted_ready = 1;
|
|
|
528
|
|
|
529 } else {
|
|
|
530 wev->ready = 1;
|
|
|
531 }
|
|
|
532
|
|
112
|
533 if (flags & NGX_POST_EVENTS) {
|
|
|
534 ngx_locked_post_event(wev, &ngx_posted_events);
|
|
0
|
535
|
|
112
|
536 } else {
|
|
|
537 wev->handler(wev);
|
|
0
|
538 }
|
|
|
539 }
|
|
|
540 }
|
|
|
541
|
|
112
|
542 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
0
|
543
|
|
|
544 return NGX_OK;
|
|
|
545 }
|
|
|
546
|
|
|
547
|
|
48
|
548 static void *
|
|
|
549 ngx_epoll_create_conf(ngx_cycle_t *cycle)
|
|
0
|
550 {
|
|
|
551 ngx_epoll_conf_t *epcf;
|
|
|
552
|
|
50
|
553 epcf = ngx_palloc(cycle->pool, sizeof(ngx_epoll_conf_t));
|
|
|
554 if (epcf == NULL) {
|
|
505
|
555 return NULL;
|
|
50
|
556 }
|
|
0
|
557
|
|
|
558 epcf->events = NGX_CONF_UNSET;
|
|
|
559
|
|
|
560 return epcf;
|
|
|
561 }
|
|
|
562
|
|
|
563
|
|
48
|
564 static char *
|
|
|
565 ngx_epoll_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
0
|
566 {
|
|
|
567 ngx_epoll_conf_t *epcf = conf;
|
|
|
568
|
|
212
|
569 ngx_conf_init_uint_value(epcf->events, 512);
|
|
0
|
570
|
|
|
571 return NGX_CONF_OK;
|
|
|
572 }
|
