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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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112
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12 static ngx_int_t ngx_poll_init(ngx_cycle_t *cycle, ngx_msec_t timer);
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0
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13 static void ngx_poll_done(ngx_cycle_t *cycle);
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324
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14 static ngx_int_t ngx_poll_add_event(ngx_event_t *ev, ngx_int_t event,
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15 ngx_uint_t flags);
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16 static ngx_int_t ngx_poll_del_event(ngx_event_t *ev, ngx_int_t event,
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17 ngx_uint_t flags);
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112
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18 static ngx_int_t ngx_poll_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
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19 ngx_uint_t flags);
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0
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20 static char *ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf);
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21
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22
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23 static struct pollfd *event_list;
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324
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24 static ngx_int_t nevents;
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0
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25
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26
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27 static ngx_str_t poll_name = ngx_string("poll");
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28
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29 ngx_event_module_t ngx_poll_module_ctx = {
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30 &poll_name,
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31 NULL, /* create configuration */
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32 ngx_poll_init_conf, /* init configuration */
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33
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34 {
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35 ngx_poll_add_event, /* add an event */
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36 ngx_poll_del_event, /* delete an event */
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37 ngx_poll_add_event, /* enable an event */
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38 ngx_poll_del_event, /* disable an event */
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39 NULL, /* add an connection */
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40 NULL, /* delete an connection */
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41 NULL, /* process the changes */
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42 ngx_poll_process_events, /* process the events */
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43 ngx_poll_init, /* init the events */
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44 ngx_poll_done /* done the events */
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45 }
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46
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47 };
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48
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49 ngx_module_t ngx_poll_module = {
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58
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50 NGX_MODULE_V1,
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0
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51 &ngx_poll_module_ctx, /* module context */
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52 NULL, /* module directives */
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53 NGX_EVENT_MODULE, /* module type */
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90
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54 NULL, /* init master */
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0
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55 NULL, /* init module */
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90
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56 NULL, /* init process */
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57 NULL, /* init thread */
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58 NULL, /* exit thread */
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59 NULL, /* exit process */
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60 NULL, /* exit master */
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61 NGX_MODULE_V1_PADDING
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0
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62 };
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63
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64
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65
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48
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66 static ngx_int_t
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112
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67 ngx_poll_init(ngx_cycle_t *cycle, ngx_msec_t timer)
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0
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68 {
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69 struct pollfd *list;
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70
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71 if (event_list == NULL) {
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72 nevents = 0;
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73 }
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74
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564
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75 if (ngx_process >= NGX_PROCESS_WORKER
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0
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76 || cycle->old_cycle == NULL
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77 || cycle->old_cycle->connection_n < cycle->connection_n)
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78 {
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50
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79 list = ngx_alloc(sizeof(struct pollfd) * cycle->connection_n,
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80 cycle->log);
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81 if (list == NULL) {
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82 return NGX_ERROR;
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83 }
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0
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84
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85 if (event_list) {
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86 ngx_memcpy(list, event_list, sizeof(ngx_event_t *) * nevents);
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87 ngx_free(event_list);
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88 }
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89
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90 event_list = list;
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91 }
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92
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93 ngx_io = ngx_os_io;
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94
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95 ngx_event_actions = ngx_poll_module_ctx.actions;
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96
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112
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97 ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_FD_EVENT;
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0
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98
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99 return NGX_OK;
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100 }
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101
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102
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48
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103 static void
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104 ngx_poll_done(ngx_cycle_t *cycle)
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0
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105 {
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106 ngx_free(event_list);
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107
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108 event_list = NULL;
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109 }
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110
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111
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48
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112 static ngx_int_t
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324
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113 ngx_poll_add_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
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0
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114 {
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115 ngx_event_t *e;
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116 ngx_connection_t *c;
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117
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118 c = ev->data;
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119
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120 ev->active = 1;
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121
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122 if (ev->index != NGX_INVALID_INDEX) {
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123 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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324
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124 "poll event fd:%d ev:%i is already set", c->fd, event);
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0
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125 return NGX_OK;
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126 }
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127
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128 if (event == NGX_READ_EVENT) {
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129 e = c->write;
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130 #if (NGX_READ_EVENT != POLLIN)
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131 event = POLLIN;
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132 #endif
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133
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134 } else {
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135 e = c->read;
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136 #if (NGX_WRITE_EVENT != POLLOUT)
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137 event = POLLOUT;
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138 #endif
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139 }
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140
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141 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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324
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142 "poll add event: fd:%d ev:%i", c->fd, event);
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0
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143
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144 if (e == NULL || e->index == NGX_INVALID_INDEX) {
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145 event_list[nevents].fd = c->fd;
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324
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146 event_list[nevents].events = (short) event;
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0
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147 event_list[nevents].revents = 0;
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148
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149 ev->index = nevents;
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150 nevents++;
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151
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152 } else {
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153 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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324
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154 "poll add index: %i", e->index);
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0
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155
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324
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156 event_list[e->index].events |= (short) event;
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0
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157 ev->index = e->index;
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158 }
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159
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160 return NGX_OK;
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161 }
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162
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163
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48
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164 static ngx_int_t
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324
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165 ngx_poll_del_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
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0
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166 {
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112
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167 ngx_event_t *e;
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168 ngx_connection_t *c;
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0
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169
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170 c = ev->data;
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171
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172 ev->active = 0;
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173
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174 if (ev->index == NGX_INVALID_INDEX) {
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175 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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324
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176 "poll event fd:%d ev:%i is already deleted",
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0
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177 c->fd, event);
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178 return NGX_OK;
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179 }
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180
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181 if (event == NGX_READ_EVENT) {
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182 e = c->write;
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183 #if (NGX_READ_EVENT != POLLIN)
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184 event = POLLIN;
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185 #endif
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186
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187 } else {
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188 e = c->read;
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189 #if (NGX_WRITE_EVENT != POLLOUT)
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190 event = POLLOUT;
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191 #endif
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192 }
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193
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194 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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324
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195 "poll del event: fd:%d ev:%i", c->fd, event);
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0
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196
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197 if (e == NULL || e->index == NGX_INVALID_INDEX) {
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198 nevents--;
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199
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324
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200 if (ev->index < (ngx_uint_t) nevents) {
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0
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201
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202 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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324
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203 "index: copy event %ui to %i", nevents, ev->index);
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0
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204
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205 event_list[ev->index] = event_list[nevents];
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206
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92
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207 c = ngx_cycle->files[event_list[nevents].fd];
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0
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208
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209 if (c->fd == -1) {
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210 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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211 "unexpected last event");
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212
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213 } else {
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324
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214 if (c->read->index == (ngx_uint_t) nevents) {
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0
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215 c->read->index = ev->index;
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216 }
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217
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324
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218 if (c->write->index == (ngx_uint_t) nevents) {
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0
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219 c->write->index = ev->index;
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220 }
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221 }
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222 }
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223
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224 } else {
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225 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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324
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226 "poll del index: %i", e->index);
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0
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227
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324
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228 event_list[e->index].events &= (short) ~event;
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0
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229 }
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230
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231 ev->index = NGX_INVALID_INDEX;
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232
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233 return NGX_OK;
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234 }
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235
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236
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48
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237 static ngx_int_t
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112
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238 ngx_poll_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, ngx_uint_t flags)
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0
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239 {
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32
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240 int ready, revents;
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106
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241 ngx_err_t err;
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0
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242 ngx_int_t i, nready;
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112
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243 ngx_uint_t found, level;
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244 ngx_event_t *ev, **queue;
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0
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245 ngx_connection_t *c;
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246
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247 /* NGX_TIMER_INFINITE == INFTIM */
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248
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249 #if (NGX_DEBUG0)
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250 if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
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251 for (i = 0; i < nevents; i++) {
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252 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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253 "poll: %d: fd:%d ev:%04Xd",
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0
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254 i, event_list[i].fd, event_list[i].events);
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255 }
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256 }
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257 #endif
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258
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106
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259 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll timer: %M", timer);
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0
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260
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261 ready = poll(event_list, (u_int) nevents, (int) timer);
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262
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529
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263 err = (ready == -1) ? ngx_errno : 0;
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0
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264
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579
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265 if (flags & NGX_UPDATE_TIME || ngx_event_timer_alarm) {
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266 ngx_time_update();
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112
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267 }
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0
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268
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269 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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270 "poll ready %d of %d", ready, nevents);
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271
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272 if (err) {
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112
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273 if (err == NGX_EINTR) {
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274
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275 if (ngx_event_timer_alarm) {
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276 ngx_event_timer_alarm = 0;
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277 return NGX_OK;
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278 }
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126
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279
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112
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280 level = NGX_LOG_INFO;
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126
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281
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282 } else {
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112
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283 level = NGX_LOG_ALERT;
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284 }
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285
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286 ngx_log_error(level, cycle->log, err, "poll() failed");
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0
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287 return NGX_ERROR;
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288 }
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289
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116
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290 if (ready == 0) {
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291 if (timer != NGX_TIMER_INFINITE) {
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292 return NGX_OK;
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293 }
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0
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294
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116
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295 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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296 "poll() returned no events without timeout");
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297 return NGX_ERROR;
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0
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298 }
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299
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112
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300 ngx_mutex_lock(ngx_posted_events_mutex);
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301
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0
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302 nready = 0;
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303
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304 for (i = 0; i < nevents && ready; i++) {
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305
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32
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306 revents = event_list[i].revents;
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307
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112
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308 #if 1
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0
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309 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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310 "poll: %d: fd:%d ev:%04Xd rev:%04Xd",
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32
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311 i, event_list[i].fd, event_list[i].events, revents);
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0
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312 #else
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32
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313 if (revents) {
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0
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314 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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315 "poll: %d: fd:%d ev:%04Xd rev:%04Xd",
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32
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316 i, event_list[i].fd, event_list[i].events, revents);
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0
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317 }
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318 #endif
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319
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32
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320 if (revents & POLLNVAL) {
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0
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321 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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10
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322 "poll() error fd:%d ev:%04Xd rev:%04Xd",
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32
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323 event_list[i].fd, event_list[i].events, revents);
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0
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324 }
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325
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32
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326 if (revents & ~(POLLIN|POLLOUT|POLLERR|POLLHUP|POLLNVAL)) {
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0
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327 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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10
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328 "strange poll() events fd:%d ev:%04Xd rev:%04Xd",
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32
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329 event_list[i].fd, event_list[i].events, revents);
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0
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330 }
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331
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332 if (event_list[i].fd == -1) {
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333 /*
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334 * the disabled event, a workaround for our possible bug,
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335 * see the comment below
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336 */
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337 continue;
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338 }
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339
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92
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340 c = ngx_cycle->files[event_list[i].fd];
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0
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341
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342 if (c->fd == -1) {
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343 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "unexpected event");
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344
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345 /*
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346 * it is certainly our fault and it should be investigated,
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347 * in the meantime we disable this event to avoid a CPU spinning
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348 */
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349
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350 if (i == nevents - 1) {
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351 nevents--;
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352 } else {
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353 event_list[i].fd = -1;
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354 }
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355
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356 continue;
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357 }
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358
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32
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359 if ((revents & (POLLERR|POLLHUP|POLLNVAL))
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360 && (revents & (POLLIN|POLLOUT)) == 0)
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361 {
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362 /*
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363 * if the error events were returned without POLLIN or POLLOUT,
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364 * then add these flags to handle the events at least in one
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365 * active handler
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366 */
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367
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368 revents |= POLLIN|POLLOUT;
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369 }
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370
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0
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371 found = 0;
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372
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32
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373 if (revents & POLLIN) {
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0
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374 found = 1;
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375
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376 ev = c->read;
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377
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112
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378 if ((flags & NGX_POST_THREAD_EVENTS) && !ev->accept) {
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379 ev->posted_ready = 1;
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380
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381 } else {
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382 ev->ready = 1;
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0
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383 }
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384
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112
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385 queue = (ngx_event_t **) (ev->accept ? &ngx_posted_accept_events:
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386 &ngx_posted_events);
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126
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387 ngx_locked_post_event(ev, queue);
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0
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388 }
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389
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32
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390 if (revents & POLLOUT) {
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0
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391 found = 1;
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392 ev = c->write;
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393
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112
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394 if (flags & NGX_POST_THREAD_EVENTS) {
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395 ev->posted_ready = 1;
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396
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397 } else {
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398 ev->ready = 1;
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0
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399 }
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400
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112
|
401 ngx_locked_post_event(ev, &ngx_posted_events);
|
|
0
|
402 }
|
|
|
403
|
|
|
404 if (found) {
|
|
|
405 ready--;
|
|
|
406 continue;
|
|
|
407 }
|
|
|
408 }
|
|
|
409
|
|
112
|
410 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
0
|
411
|
|
|
412 if (ready != 0) {
|
|
|
413 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "poll ready != events");
|
|
|
414 }
|
|
|
415
|
|
|
416 return nready;
|
|
|
417 }
|
|
|
418
|
|
|
419
|
|
48
|
420 static char *
|
|
|
421 ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
0
|
422 {
|
|
|
423 ngx_event_conf_t *ecf;
|
|
|
424
|
|
|
425 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
|
|
|
426
|
|
|
427 if (ecf->use != ngx_poll_module.ctx_index) {
|
|
|
428 return NGX_CONF_OK;
|
|
|
429 }
|
|
|
430
|
|
|
431 #if (NGX_THREADS)
|
|
|
432
|
|
|
433 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
|
434 "poll() is not supported in the threaded mode");
|
|
|
435 return NGX_CONF_ERROR;
|
|
|
436
|
|
|
437 #else
|
|
|
438
|
|
|
439 return NGX_CONF_OK;
|
|
|
440
|
|
|
441 #endif
|
|
|
442 }
|
