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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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660
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4 * Copyright (C) Nginx, Inc.
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0
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_event.h>
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11
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12
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112
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13 static ngx_int_t ngx_poll_init(ngx_cycle_t *cycle, ngx_msec_t timer);
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0
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14 static void ngx_poll_done(ngx_cycle_t *cycle);
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324
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15 static ngx_int_t ngx_poll_add_event(ngx_event_t *ev, ngx_int_t event,
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16 ngx_uint_t flags);
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17 static ngx_int_t ngx_poll_del_event(ngx_event_t *ev, ngx_int_t event,
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18 ngx_uint_t flags);
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112
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19 static ngx_int_t ngx_poll_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
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20 ngx_uint_t flags);
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0
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21 static char *ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf);
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22
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23
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24 static struct pollfd *event_list;
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324
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25 static ngx_int_t nevents;
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0
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26
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27
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28 static ngx_str_t poll_name = ngx_string("poll");
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29
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30 ngx_event_module_t ngx_poll_module_ctx = {
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31 &poll_name,
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32 NULL, /* create configuration */
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33 ngx_poll_init_conf, /* init configuration */
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34
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35 {
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36 ngx_poll_add_event, /* add an event */
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37 ngx_poll_del_event, /* delete an event */
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38 ngx_poll_add_event, /* enable an event */
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39 ngx_poll_del_event, /* disable an event */
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40 NULL, /* add an connection */
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41 NULL, /* delete an connection */
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42 NULL, /* process the changes */
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43 ngx_poll_process_events, /* process the events */
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44 ngx_poll_init, /* init the events */
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45 ngx_poll_done /* done the events */
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46 }
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47
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48 };
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49
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50 ngx_module_t ngx_poll_module = {
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58
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51 NGX_MODULE_V1,
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0
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52 &ngx_poll_module_ctx, /* module context */
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53 NULL, /* module directives */
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54 NGX_EVENT_MODULE, /* module type */
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90
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55 NULL, /* init master */
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0
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56 NULL, /* init module */
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90
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57 NULL, /* init process */
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58 NULL, /* init thread */
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59 NULL, /* exit thread */
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60 NULL, /* exit process */
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61 NULL, /* exit master */
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62 NGX_MODULE_V1_PADDING
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0
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63 };
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64
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65
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66
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48
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67 static ngx_int_t
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112
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68 ngx_poll_init(ngx_cycle_t *cycle, ngx_msec_t timer)
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0
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69 {
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70 struct pollfd *list;
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71
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72 if (event_list == NULL) {
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73 nevents = 0;
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74 }
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75
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552
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76 if (ngx_process >= NGX_PROCESS_WORKER
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0
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77 || cycle->old_cycle == NULL
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78 || cycle->old_cycle->connection_n < cycle->connection_n)
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79 {
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50
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80 list = ngx_alloc(sizeof(struct pollfd) * cycle->connection_n,
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81 cycle->log);
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82 if (list == NULL) {
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83 return NGX_ERROR;
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84 }
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0
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85
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86 if (event_list) {
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87 ngx_memcpy(list, event_list, sizeof(ngx_event_t *) * nevents);
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88 ngx_free(event_list);
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89 }
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90
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91 event_list = list;
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92 }
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93
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94 ngx_io = ngx_os_io;
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95
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96 ngx_event_actions = ngx_poll_module_ctx.actions;
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97
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112
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98 ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_FD_EVENT;
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0
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99
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100 return NGX_OK;
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101 }
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102
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103
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48
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104 static void
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105 ngx_poll_done(ngx_cycle_t *cycle)
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0
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106 {
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107 ngx_free(event_list);
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108
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109 event_list = NULL;
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110 }
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111
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112
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48
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113 static ngx_int_t
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324
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114 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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115 {
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116 ngx_event_t *e;
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117 ngx_connection_t *c;
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118
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119 c = ev->data;
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120
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121 ev->active = 1;
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122
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123 if (ev->index != NGX_INVALID_INDEX) {
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124 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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324
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125 "poll event fd:%d ev:%i is already set", c->fd, event);
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0
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126 return NGX_OK;
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127 }
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128
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129 if (event == NGX_READ_EVENT) {
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130 e = c->write;
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131 #if (NGX_READ_EVENT != POLLIN)
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132 event = POLLIN;
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133 #endif
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134
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135 } else {
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136 e = c->read;
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137 #if (NGX_WRITE_EVENT != POLLOUT)
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138 event = POLLOUT;
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139 #endif
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140 }
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141
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142 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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324
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143 "poll add event: fd:%d ev:%i", c->fd, event);
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0
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144
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145 if (e == NULL || e->index == NGX_INVALID_INDEX) {
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146 event_list[nevents].fd = c->fd;
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324
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147 event_list[nevents].events = (short) event;
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0
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148 event_list[nevents].revents = 0;
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149
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150 ev->index = nevents;
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151 nevents++;
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152
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153 } else {
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154 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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324
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155 "poll add index: %i", e->index);
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0
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156
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324
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157 event_list[e->index].events |= (short) event;
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0
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158 ev->index = e->index;
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159 }
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160
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161 return NGX_OK;
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162 }
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163
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164
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48
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165 static ngx_int_t
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324
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166 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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167 {
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112
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168 ngx_event_t *e;
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169 ngx_connection_t *c;
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0
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170
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171 c = ev->data;
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172
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173 ev->active = 0;
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174
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175 if (ev->index == NGX_INVALID_INDEX) {
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176 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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324
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177 "poll event fd:%d ev:%i is already deleted",
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0
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178 c->fd, event);
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179 return NGX_OK;
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180 }
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181
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182 if (event == NGX_READ_EVENT) {
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183 e = c->write;
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184 #if (NGX_READ_EVENT != POLLIN)
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185 event = POLLIN;
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186 #endif
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187
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188 } else {
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189 e = c->read;
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190 #if (NGX_WRITE_EVENT != POLLOUT)
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191 event = POLLOUT;
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192 #endif
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193 }
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194
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195 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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324
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196 "poll del event: fd:%d ev:%i", c->fd, event);
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0
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197
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198 if (e == NULL || e->index == NGX_INVALID_INDEX) {
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199 nevents--;
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200
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324
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201 if (ev->index < (ngx_uint_t) nevents) {
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0
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202
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203 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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324
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204 "index: copy event %ui to %i", nevents, ev->index);
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0
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205
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206 event_list[ev->index] = event_list[nevents];
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207
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92
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208 c = ngx_cycle->files[event_list[nevents].fd];
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0
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209
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210 if (c->fd == -1) {
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211 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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212 "unexpected last event");
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213
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214 } else {
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324
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215 if (c->read->index == (ngx_uint_t) nevents) {
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0
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216 c->read->index = ev->index;
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217 }
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218
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324
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219 if (c->write->index == (ngx_uint_t) nevents) {
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0
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220 c->write->index = ev->index;
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221 }
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222 }
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223 }
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224
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225 } else {
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226 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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324
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227 "poll del index: %i", e->index);
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0
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228
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324
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229 event_list[e->index].events &= (short) ~event;
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0
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230 }
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231
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232 ev->index = NGX_INVALID_INDEX;
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233
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234 return NGX_OK;
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235 }
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236
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237
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48
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238 static ngx_int_t
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112
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239 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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240 {
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32
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241 int ready, revents;
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106
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242 ngx_err_t err;
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0
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243 ngx_int_t i, nready;
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112
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244 ngx_uint_t found, level;
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245 ngx_event_t *ev, **queue;
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0
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246 ngx_connection_t *c;
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247
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248 /* NGX_TIMER_INFINITE == INFTIM */
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249
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250 #if (NGX_DEBUG0)
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251 if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
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252 for (i = 0; i < nevents; i++) {
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253 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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254 "poll: %d: fd:%d ev:%04Xd",
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0
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255 i, event_list[i].fd, event_list[i].events);
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256 }
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257 }
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258 #endif
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259
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106
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260 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll timer: %M", timer);
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0
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261
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262 ready = poll(event_list, (u_int) nevents, (int) timer);
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263
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518
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264 err = (ready == -1) ? ngx_errno : 0;
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0
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265
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566
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266 if (flags & NGX_UPDATE_TIME || ngx_event_timer_alarm) {
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267 ngx_time_update();
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112
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268 }
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0
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269
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270 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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271 "poll ready %d of %d", ready, nevents);
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272
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273 if (err) {
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112
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274 if (err == NGX_EINTR) {
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275
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276 if (ngx_event_timer_alarm) {
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277 ngx_event_timer_alarm = 0;
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278 return NGX_OK;
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279 }
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126
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280
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112
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281 level = NGX_LOG_INFO;
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126
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282
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283 } else {
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112
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284 level = NGX_LOG_ALERT;
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285 }
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286
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287 ngx_log_error(level, cycle->log, err, "poll() failed");
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0
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288 return NGX_ERROR;
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289 }
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290
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116
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291 if (ready == 0) {
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292 if (timer != NGX_TIMER_INFINITE) {
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293 return NGX_OK;
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294 }
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0
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295
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116
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296 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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297 "poll() returned no events without timeout");
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298 return NGX_ERROR;
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0
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299 }
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300
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112
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301 ngx_mutex_lock(ngx_posted_events_mutex);
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302
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0
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303 nready = 0;
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304
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305 for (i = 0; i < nevents && ready; i++) {
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306
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32
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307 revents = event_list[i].revents;
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308
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112
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309 #if 1
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0
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310 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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311 "poll: %d: fd:%d ev:%04Xd rev:%04Xd",
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32
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312 i, event_list[i].fd, event_list[i].events, revents);
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0
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313 #else
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32
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314 if (revents) {
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0
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315 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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316 "poll: %d: fd:%d ev:%04Xd rev:%04Xd",
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32
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317 i, event_list[i].fd, event_list[i].events, revents);
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0
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318 }
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319 #endif
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320
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32
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321 if (revents & POLLNVAL) {
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0
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322 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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10
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323 "poll() error fd:%d ev:%04Xd rev:%04Xd",
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32
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324 event_list[i].fd, event_list[i].events, revents);
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0
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325 }
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326
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32
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327 if (revents & ~(POLLIN|POLLOUT|POLLERR|POLLHUP|POLLNVAL)) {
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0
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328 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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10
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329 "strange poll() events fd:%d ev:%04Xd rev:%04Xd",
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32
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330 event_list[i].fd, event_list[i].events, revents);
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0
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331 }
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332
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333 if (event_list[i].fd == -1) {
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334 /*
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335 * the disabled event, a workaround for our possible bug,
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336 * see the comment below
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337 */
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338 continue;
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339 }
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340
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92
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341 c = ngx_cycle->files[event_list[i].fd];
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0
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342
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343 if (c->fd == -1) {
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344 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "unexpected event");
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345
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346 /*
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347 * it is certainly our fault and it should be investigated,
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348 * in the meantime we disable this event to avoid a CPU spinning
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349 */
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350
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351 if (i == nevents - 1) {
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352 nevents--;
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353 } else {
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354 event_list[i].fd = -1;
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355 }
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356
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357 continue;
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358 }
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359
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32
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360 if ((revents & (POLLERR|POLLHUP|POLLNVAL))
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361 && (revents & (POLLIN|POLLOUT)) == 0)
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362 {
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363 /*
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364 * if the error events were returned without POLLIN or POLLOUT,
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365 * then add these flags to handle the events at least in one
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366 * active handler
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367 */
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368
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369 revents |= POLLIN|POLLOUT;
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370 }
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371
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0
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372 found = 0;
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373
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32
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374 if (revents & POLLIN) {
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0
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375 found = 1;
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376
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377 ev = c->read;
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378
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112
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379 if ((flags & NGX_POST_THREAD_EVENTS) && !ev->accept) {
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380 ev->posted_ready = 1;
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381
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382 } else {
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383 ev->ready = 1;
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0
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384 }
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385
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112
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386 queue = (ngx_event_t **) (ev->accept ? &ngx_posted_accept_events:
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387 &ngx_posted_events);
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126
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388 ngx_locked_post_event(ev, queue);
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0
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389 }
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390
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32
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391 if (revents & POLLOUT) {
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0
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392 found = 1;
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393 ev = c->write;
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394
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112
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395 if (flags & NGX_POST_THREAD_EVENTS) {
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396 ev->posted_ready = 1;
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397
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398 } else {
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399 ev->ready = 1;
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|
0
|
400 }
|
|
|
401
|
|
112
|
402 ngx_locked_post_event(ev, &ngx_posted_events);
|
|
0
|
403 }
|
|
|
404
|
|
|
405 if (found) {
|
|
|
406 ready--;
|
|
|
407 continue;
|
|
|
408 }
|
|
|
409 }
|
|
|
410
|
|
112
|
411 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
0
|
412
|
|
|
413 if (ready != 0) {
|
|
|
414 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "poll ready != events");
|
|
|
415 }
|
|
|
416
|
|
|
417 return nready;
|
|
|
418 }
|
|
|
419
|
|
|
420
|
|
48
|
421 static char *
|
|
|
422 ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
0
|
423 {
|
|
|
424 ngx_event_conf_t *ecf;
|
|
|
425
|
|
|
426 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
|
|
|
427
|
|
|
428 if (ecf->use != ngx_poll_module.ctx_index) {
|
|
|
429 return NGX_CONF_OK;
|
|
|
430 }
|
|
|
431
|
|
|
432 #if (NGX_THREADS)
|
|
|
433
|
|
|
434 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
|
435 "poll() is not supported in the threaded mode");
|
|
|
436 return NGX_CONF_ERROR;
|
|
|
437
|
|
|
438 #else
|
|
|
439
|
|
|
440 return NGX_CONF_OK;
|
|
|
441
|
|
|
442 #endif
|
|
|
443 }
|
